FCC ID: XMR2021BC660KGL NB-IoT Module

BC660K-GL Hardware Design NB-IoT Module Series Version: 1.0.0 Date: 2020-11-20 Status: Preliminary www.quectel.com NB-IoT Module Series BC660K-GL Hardware Design Our aim is to provide customers with timely and comprehensive service. For any assistance, please contact our company headquarters:

Quectel Wireless Solutions Co., Ltd. Building 5, Shanghai Business Park Phase III (Area B), No.1016 Tianlin Road, Minhang District, Shanghai 200233, China Tel: +86 21 5108 6236 Email: info@quectel.com Or our local office. For more information, please visit:

http://www.quectel.com/support/sales.htm. For technical support, or to report documentation errors, please visit:

http://www.quectel.com/support/technical.htm Or email to support@quectel.com. General Notes Quectel offers the information as a service to its customers. The information provided is based upon customers requirements. Quectel makes every effort to ensure the quality of the information it makes available. Quectel does not make any warranty as to the information contained herein, and does not accept any liability for any injury, loss or damage of any kind incurred by use of or reliance upon the information. All information supplied herein is subject to change without prior notice. Disclaimer While Quectel has made efforts to ensure that the functions and features under development are free from errors, it is possible that these functions and features could contain errors, inaccuracies and omissions. Unless otherwise provided by valid agreement, Quectel makes no warranties of any kind, implied or express, with respect to the use of features and functions under development. To the maximum extent permitted by law, Quectel excludes all liability for any loss or damage suffered in connection with the use of the functions and features under development, regardless of whether such loss or damage may have been foreseeable. Duty of Confidentiality The Receiving Party shall keep confidential all documentation and information provided by Quectel, except when the specific permission has been granted by Quectel. The Receiving Party shall not access or use Quectels documentation and information for any purpose except as expressly provided herein. Furthermore, the Receiving Party shall not disclose any of the Quectel's documentation and information to the prior written consent by Quectel. For any noncompliance to the above any third party without requirements, unauthorized use, or other illegal or malicious use of the documentation and information, Quectel will reserve the right to take legal action. BC660K-GL_Hardware_Design 1 / 59 NB-IoT Module Series BC660K-GL Hardware Design Copyright The information contained here is proprietary technical information of Quectel wireless solutions co., ltd. Transmitting, reproducing, disseminating and editing this document as well as using the content without permission are forbidden. Offenders will be held liable for payment of damages. All rights are reserved in the event of a patent grant or registration of a utility model or design. Copyright Quectel Wireless Solutions Co., Ltd. 2020. All rights reserved. BC660K-GL_Hardware_Design 2 / 59 NB-IoT Module Series BC660K-GL Hardware Design About the Document Revision History Version Date Author Description

2020-09-30 Creation of the document 1.0.0 2020-11-20 Preliminary Clifton HE/

Ellison WANG/

Randy LI Clifton HE/

Ellison WANG/

Randy LI BC660K-GL_Hardware_Design 3 / 59 NB-IoT Module Series BC660K-GL Hardware Design Contents About the Document................................................................................................................................................. 3 Contents....................................................................................................................................................................... 4 Table Index.................................................................................................................................................................. 6 Figure Index.................................................................................................................................................................7 1 2 3 Introduction......................................................................................................................................................... 8 Safety Information....................................................................................................................................9 1.1. Product Concept..............................................................................................................................................10 2.1. General Description...............................................................................................................................10 Key Features.......................................................................................................................................... 11 2.2. Functional Diagram............................................................................................................................... 12 2.3. Evaluation Board....................................................................................................................................13 2.4. 3.6. 3.5. 3.4.1. 3.4.2. 3.5.1. 3.5.2. 3.5.3. Application Interfaces.................................................................................................................................... 14 Pin Assignment...................................................................................................................................... 15 3.1. Pin Description....................................................................................................................................... 16 3.2. 3.3. Operating Modes................................................................................................................................... 20 Power Saving......................................................................................................................................... 21 3.4. Light Sleep..................................................................................................................................21 Deep Sleep.................................................................................................................................21 Power Supply......................................................................................................................................... 22 Power Supply Pins....................................................................................................................22 Reference Design for Power Supply......................................................................................23 Power Supply Voltage Detection*.......................................................................................... 23 Power-up/Power-down Scenarios...................................................................................................... 24 Power-up.................................................................................................................................... 24 Power-down............................................................................................................................... 25 Reset........................................................................................................................................... 25 Download....................................................................................................................................26 3.7. UART Interfaces.................................................................................................................................... 27 3.7.1. Main UART Port........................................................................................................................ 28 Debug UART Port..................................................................................................................... 28 3.7.2. UART Application......................................................................................................................29 3.7.3.

(U)SIM Interface.....................................................................................................................................31 3.8. ADC Interface*....................................................................................................................................... 33 3.9. 3.10. RI Interface*............................................................................................................................................33 3.11. NETLIGHT Interface*............................................................................................................................34 3.6.1. 3.6.2. 3.6.3. 3.6.4. 4 Antenna Interface............................................................................................................................................ 36 Pin Definition.......................................................................................................................................... 36 4.1. 4.2. Operating Frequencies......................................................................................................................... 36 4.3. RF Antenna Reference Design........................................................................................................... 37 BC660K-GL_Hardware_Design 4 / 59 NB-IoT Module Series BC660K-GL Hardware Design 4.4. Reference Design of RF Layout..........................................................................................................38 Antenna Requirements......................................................................................................................... 40 4.5. 4.6. RF Output Power................................................................................................................................... 41 4.7. RF Receiving Sensitivity.......................................................................................................................42 4.8. Recommended RF Connector for Antenna Installation.................................................................. 43 Reliability and Electrical Characteristics..................................................................................................45 5.1. Operating and Storage Temperatures............................................................................................... 45 5.2. Current Consumption............................................................................................................................46 Electrostatic Discharge......................................................................................................................... 48 5.3. 6 Mechanical Features.......................................................................................................................................49 6.1. Mechanical Dimensions........................................................................................................................49 6.2. Recommended Footprint......................................................................................................................51 Top and Bottom Views..........................................................................................................................52 6.3. Storage, Manufacturing and Packaging....................................................................................................53 Storage.................................................................................................................................................... 53 7.1. 7.2. Manufacturing and Soldering...............................................................................................................54 Tape and Reel Packaging....................................................................................................................55 7.3. 8 Appendix A References................................................................................................................................. 57 5 7 BC660K-GL_Hardware_Design 5 / 59 NB-IoT Module Series BC660K-GL Hardware Design Table Index Table 1: Frequency Bands of BC660K-GL............................................................................................................10 Table 2: BC660K-GL Key Features........................................................................................................................11 Table 3: I/O Parameters Definition......................................................................................................................... 16 Table 4: Pin Description........................................................................................................................................... 16 Table 5: AP Operating Modes................................................................................................................................. 20 Table 6: Modem Operating Modes......................................................................................................................... 20 Table 7: Module Operating Modes......................................................................................................................... 20 Table 8: Power Supply Pins.....................................................................................................................................23 Table 9: Reset Pin Definition................................................................................................................................... 25 Table 10: Pin Definition of UART Interfaces......................................................................................................... 27 Table 11: Pin Definition of (U)SIM Interface......................................................................................................... 31 Table 12: Pin Definition of ADC Interface..............................................................................................................33 Table 13: RI Signal Status....................................................................................................................................... 33 Table 14: Pin Definition of NB-IoT Antenna Interface......................................................................................... 36 Table 15: Module Operating Frequencies.............................................................................................................36 Table 16: Antenna Cable Insertion Loss Requirements..................................................................................... 40 Table 17: Required Antenna Parameters..............................................................................................................40 Table 18: RF Conducted Output Power................................................................................................................ 41 Table 19: Receiving Sensitivity (with RF Retransmissions)...............................................................................42 Table 20: Operation and Storage Temperatures................................................................................................. 45 Table 21: Module Current Consumption (3.3 V VBAT Power Supply).............................................................46 Table 22: Electrostatic Discharge Characteristics (25 C, 45 % Relative Humidity)..................................... 48 Table 23: Recommended Thermal Profile Parameters...................................................................................... 55 Table 24: Related Documents.................................................................................................................................57 Table 25: Terms and Abbreviations....................................................................................................................... 57 BC660K-GL_Hardware_Design 6 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure Index Figure 1: Functional Diagram.................................................................................................................................. 13 Figure 2: Pin Assignment......................................................................................................................................... 15 Figure 3: Module Power Consumption in Different Modes (Modem)............................................................... 21 Figure 4: Timing of Waking up Module from PSM............................................................................................... 22 Figure 5: Reference Circuit for Power Supply...................................................................................................... 23 Figure 6: Power-up Timing.......................................................................................................................................24 Figure 7: Power-down Timing..................................................................................................................................25 Figure 8: Reference Circuit of RESET_N by Using Driving Circuit...................................................................25 Figure 9: Reference Circuit of RESET_N by Using Button................................................................................ 26 Figure 10: Reference Circuit of BOOT by Using Button..................................................................................... 27 Figure 11: Reference Design for Main UART Port.............................................................................................. 28 Figure 12: Reference Design of Debug UART Port............................................................................................ 28 Figure 13: Reference Circuit Design of UART..................................................................................................... 29 Figure 14: Sketch Map for RS-232 Interface Match............................................................................................ 30 Figure 15: Reference Circuit with Transistor Circuit............................................................................................31 Figure 16: Reference Circuit for (U)SIM Interface with a 6-pin (U)SIM Card Connector..............................32 Figure 17: RI Behaviour When a URC is Received.............................................................................................34 Figure 18: Reference Design of NETLIGHT......................................................................................................... 35 Figure 19: Reference Design of NB-IoT Antenna Interface............................................................................... 38 Figure 20: Microstrip Design on a 2-layer PCB....................................................................................................38 Figure 21: Coplanar Waveguide Design on a 2-layer PCB................................................................................39 Figure 22: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground).......................39 Figure 23: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground).......................39 Figure 24: Dimensions of the U.FL-R-SMT Connector (Unit: mm)................................................................... 43 Figure 25: Mechanicals of U.FL-LP Connectors.................................................................................................. 43 Figure 26: Space Factor of Mated Connector (Unit: mm).................................................................................. 44 Figure 27: BC660K-GL Top and Side Dimensions (Unit: mm)..........................................................................49 Figure 28: Module Bottom Dimension (Bottom View)......................................................................................... 50 Figure 29: Recommended Footprint (Unit: mm)...................................................................................................51 Figure 30: Top View of the Module.........................................................................................................................52 Figure 31: Bottom View of the Module...................................................................................................................52 Figure 32: Recommended Reflow Soldering Thermal Profile........................................................................... 54 Figure 33: Tape Dimensions (Unit: mm)................................................................................................................56 Figure 34: Reel Dimensions (Unit: mm)................................................................................................................ 56 BC660K-GL_Hardware_Design 7 / 59 NB-IoT Module Series BC660K-GL Hardware Design 1 Introduction This document defines the BC660K-GL module and describes its air interfaces and hardware interface which are connected with the customers applications. This document helps customers quickly understand the interface specifications, electrical and mechanical details, as well as other related information of the module. To facilitate application designs, it also includes some reference designs for customers reference. The document, coupled with application notes and user guides, makes it easy to design and set up mobile applications with BC660K-GL. BC660K-GL_Hardware_Design 1-8 / 59 NB-IoT Module Series BC660K-GL Hardware Design 1.1. Safety Information The following safety precautions must be observed during all phases of operation, such as usage, service or repair of any cellular terminal or mobile incorporating the module. Manufacturers of the cellular terminal should notify users and operating personnel of the following safety information by incorporating these guidelines into all manuals of the product. Otherwise, Quectel assumes no liability for customers failure to comply with these precautions. Full attention must be paid to driving at all times in order to reduce the risk of an accident. Using a mobile while driving (even with a handsfree kit) causes distraction and can lead to an accident. Please comply with laws and regulations restricting the use of wireless devices while driving. Switch off the cellular terminal or mobile before boarding an aircraft. The operation interference with of wireless appliances in an aircraft communication systems. If there is an Airplane Mode, it should be enabled prior to boarding an aircraft. Please consult the airline staff for more restrictions on the use of wireless devices on an aircraft. is forbidden to prevent Wireless devices may cause interference on sensitive medical equipment, so the restrictions on the use of wireless devices when in please be aware of hospitals, clinics or other healthcare facilities. Cellular terminals or mobiles operating over radio signals and cellular network cannot be guaranteed to connect in all possible conditions (for example, with unpaid bills or with an invalid (U)SIM card). When emergency help is needed in such conditions, please remember using emergency call. In order to make or receive a call, the cellular terminal or mobile must be switched on in a service area with adequate cellular signal strength. The cellular terminal or mobile contains a transmitter and receiver. When it is ON, it receives and transmits radio frequency signals. RF interference can occur if it is used close to TV set, radio, computer or other electric equipment. In locations with potentially explosive atmospheres, obey all posted signs to turn off wireless devices such as mobile phone or other cellular terminals. Areas with potentially explosive atmospheres include fuelling areas, below decks on boats, fuel or chemical transfer or storage facilities, areas where the air contains chemicals or particles such as grain, dust or metal powders, etc. BC660K-GL_Hardware_Design 1-9 / 59 NB-IoT Module Series BC660K-GL Hardware Design 2 Product Concept 2.1. General Description BC660K-GL is a high-performance NB-IoT module with extremely low power consumption. It is designed to communicate with infrastructures of mobile network operators through NB-IoT radio protocols (3GPP Rel-13 and 3GPP Rel-14). BC660K-GL supports a broad range of frequency bands as listed below. Table 1: Frequency Bands of BC660K-GL Mode BC660K-GL H-FDD B1/B2/B3/B4/B5/B8/B12/B13/ B17/B18/B19/B20/B25/B28/B66/B70/B85 BC660K-GL is an SMD type module with LCC and LGA package, and has an ultra-compact profile of 17.7 mm 15.8 mm 2.0 mm, which makes it easily embedded into size-constrained applications and provide reliable connectivity with the applications. BC660K-GL provides abundant external

(UDP/TCP/LwM2M*/MQTT*, etc.), which provide great convenience for customers' applications. interfaces (UART, ADC, (U)SIM, etc) and protocol stacks Due to compact form factor, ultra-low power consumption and extended temperature range, BC660K-GL is a best choice for a wide range of IoT applications, such as smart metering, bike sharing, smart wearables, smart parking, smart city, home appliances, security and asset tracking, agricultural and environmental monitoring, etc. It is able to provide a complete range of SMS* and data transmission services to meet customers demands. The module fully complies with the RoHS directive of the European Union. NOTE

* means under development. BC660K-GL_Hardware_Design 2-10 / 59 NB-IoT Module Series BC660K-GL Hardware Design 2.2. Key Features The following table describes the detailed features of BC660K-GL module. Table 2: BC660K-GL Key Features Feature Details Power Supply Supply voltage: 2.24.3 V Typical supply voltage: 3.3 V Power Saving Typical power consumption: 800 nA Frequency Bands LTE Cat NB2:

B1/B2/B3/B4/B5/B8/B12/B13/B17/B18/B19/B20/B25/B28/B66/B70/B85 Transmitting Power 23 dBm 2 dB

(U)SIM Interface Support 1.8/3.0 V (U)SIM card Main UART Port:

Used for AT command communication and data transmission, the baud rate is 115200 bps by default. For more details, see Chapter 3.7.1. Used for firmware upgrade, and in such case, the baud rate is 921600 UART Interfaces bps by default. Debug UART Port:

Used for firmware debugging Default baud rate: 6 Mbps Network Protocols UDP/TCP/SNTP/LwM2M*/MQTT*/TLS*/DTLS*

SMS*

Text/PDU Mode Data Transmission Features AT Commands Firmware Update Single-tone (max): 25.5 kbps (DL)/16.7 kbps (UL) Multi-tone (max): 127 kbps (DL)/158.5 kbps (UL) 3GPP TS 27.005/3GPP TS 27.007 AT commands (3GPP Rel-13 and 3GPP Rel-14) and Quectel enhanced AT commands Upgrade firmware via main UART port Upgrade firmware via DFOTA Real Time Clock Supported Physical Characteristics Temperature Range Size: (17.7 0.15) mm (15.8 0.15) mm (2.0 0.2) mm Weight: 1.0 0.2 g Operating temperature range: -35 to +75 C 1) Extended temperature range: -40 to +85 C 2) Storage temperature range: -40 to +90 C BC660K-GL_Hardware_Design 2-11 / 59 NB-IoT Module Series BC660K-GL Hardware Design Antenna Interface 50 impedance control RoHS All hardware components are fully compliant with EU RoHS directive NOTES 1. 2. 3. 1) Within operating temperature range, the module is 3GPP compliant. 2) Within extended temperature range, the module remains the ability to establish and maintain functions such as SMS* and data transmission, without any unrecoverable malfunction. Radio spectrum and radio network will not be influenced, while one or more specifications, such as Pout, may exceed the specified tolerances of 3GPP. When the temperature returns to the normal operation temperature levels, the module will meet 3GPP specifications again.

"*" means under development. The following figure shows a block diagram of BC660K-GL and illustrates the major functional parts. 2.3. Functional Diagram Radio frequency Baseband Power management Peripheral interfaces BC660K-GL_Hardware_Design 2-12 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 1: Functional Diagram 2.4. Evaluation Board Quectel provides a complete set of development tools to facilitate the use and testing of BC660K-GL module. The development includes the TE-B board, a USB cable, an antenna and other peripherals. For more details, see document [1]. tool kit BC660K-GL_Hardware_Design 2-13 / 59 NB-IoT Module Series BC660K-GL Hardware Design 3 Application Interfaces BC660K-GL is equipped with a total of 58 pins, including 44 LCC pins and 14 LGA pins. The subsequent chapters will provide detailed descriptions of the following functions/pins/interfaces:

Power Supply PSM_EINT RESET_N BOOT UART Interfaces

(U)SIM Interface ADC Interface*

RI Interface*

NETLIGHT Interface*

NOTE

"*" means under development. BC660K-GL_Hardware_Design 3-14 / 59 3.1. Pin Assignment NB-IoT Module Series BC660K-GL Hardware Design Figure 2: Pin Assignment NOTE Keep all reserved and unused pins unconnected. BC660K-GL_Hardware_Design 3-15 / 59 NB-IoT Module Series BC660K-GL Hardware Design 3.2. Pin Description Table 3: I/O Parameters Definition Type AI AO DI DO IO PI PO Description Analog input Analog output Digital input Digital output Bidirectional Power input Power output Table 4: Pin Description Power Supply Pin Name Pin No. I/O Description DC Characteristics Comment VBAT 42, 43 PI Power supply for the module Vmax = 4.3 V Vmin = 2.2 V Vnorm = 3.3 V VDD_EXT 24 PO Vnorm = 1.8/3.3 V 1.8/3.3 V output for external circuit No voltage output in Deep Sleep/Light Sleep mode. It is intended to supply power for the modules pull-up circuits, and is not recommended to be used as the power supply for external circuits. GND 1, 27, 34, 36, 37, 40, 41, 56, 57, 58 Power Key Interface Pin Name Pin No. I/O Description DC Characteristics Comment BC660K-GL_Hardware_Design 3-16 / 59 NB-IoT Module Series BC660K-GL Hardware Design BOOT 7 DI Reset Interface Control module enter download mode VILmax = 0.2 VDD_EXT VIHmin = 0.7 VDD_EXT Active low. Pin Name Pin No. I/O Description DC Characteristics Comment RESET_N 15 DI Active low. Reset the module VILmax = 0.38 V VIHmin = 1.33 V VIHmax = 3.6 V PSM_EINT Interface Pin Name Pin No. I/O Description DC Characteristics Comment Dedicated external interrupt pin used to wake up the module from Deep Sleep/Light Sleep mode.. VILmax = 0.38 V VIHmin = 1.33 V VIHmax = 3.6 V Active on falling edge. PSM_EINT 19 DI Network Status Indication*

NETLIGHT 16 DO ADC Interface*

Pin Name Pin No. I/O Description DC Characteristics Comment Indicate the module's network activity status VOLmax = 0.15 VDD_EXT VOHmin = 0.8 VDD_EXT Pin Name Pin No. I/O Description DC Characteristics Comment ADC0 9 AI Main UART Port General-purpose analog to digital converter interface Voltage range:

01.2 V Pin Name Pin No. I/O Description DC Characteristics Comment MAIN_RXD 18 MAIN_TXD 17 DI DO Main UART receive Main UART transmit VILmax = 0.2 VDD_EXT VIHmin = 0.7 VDD_EXT VOLmax = 0.15 VDD_EXT VOHmin = 0.8 VDD_EXT VDD_EXT power domain. BC660K-GL_Hardware_Design 3-17 / 59 NB-IoT Module Series BC660K-GL Hardware Design Debug UART Port DBG_RXD 38 DBG_TXD 39 Ringing Signal*

(U)SIM Interface Pin Name Pin No. I/O Description DC Characteristics Comment DI DO Debug UART receive Debug UART transmit VILmax = 0.2 VDD_EXT VIHmin = 0.7 VDD_EXT VOLmax = 0.15 VDD_EXT VOHmin = 0.8 VDD_EXT VDD_EXT power domain. Pin Name Pin No. I/O Description DC Characteristics Comment RI 20 DO Ring indication VOLmax = 0.15 VDD_EXT VOHmin = 0.8 VDD_EXT VDD_EXT power domain. Pin Name Pin No. I/O Description DC Characteristics Comment

(U)SIM_VDD 14 Vnorm = 1.8/3.0 V VOLmax = 0.15 (U)SIM_VDD VOHmin = 0.8 (U)SIM_VDD VILmax = 0.2 (U)SIM_VDD VIHmin = 0.7 (U)SIM_VDD VOLmax = 0.15 (U)SIM_VDD VOHmin = 0.8 (U)SIM_VDD VOLmax = 0.15 (U)SIM_VDD VOHmin = 0.8 (U)SIM_VDD DO DO

(U)SIM card power supply

(U)SIM card reset

(U)SIM card data

(U)SIM card clock Specified ground for

(U)SIM card

(U)SIM_RST 12

(U)SIM_DAT A 11 IO

(U)SIM_CLK 13 DO

(U)SIM_GND 10 Antenna Interface ANT_RF 35 IO RF antenna interface Pin Name Pin No. I/O Description DC Characteristics Comment 50 characteristic impedance GPIO Interfaces GPIO1 GPIO2 3 4 Pin Name Pin No. I/O Description DC Characteristics Comment IO IO General-purpose input/output General-purpose input/output VILmax = 0.2 VDD_EXT VIHmin = 0.7 VDD_EXT VOLmax = 0.15 VDD_EXT VOHmin = 0.8 VDD_EXT VDD_EXT power domain. BC660K-GL_Hardware_Design 3-18 / 59 Pin Name Pin No. I/O Description DC Characteristics Comment NB-IoT Module Series BC660K-GL Hardware Design If unused, keep these pins open. 1.8 V power domain. If unused, keep these pins open. Control VDD_EXT voltage select 1.8 V or 3.3 V Keep these pins open. GRFC Interfaces GPIO3 GPIO4 GRFC1 GRFC2 5 6 54 55 Other Interface Pin IO IO General-purpose input/output General-purpose input/output DO DO Generic RF controller Generic RF controller VIO_SEL 52 DI Reserved Pins IO Voltage selection Floating: 1.8 V 0: 3.3 V Pin Name Pin No. I/O Description DC Characteristics Comment Pin Name Pin No. I/O Description DC Characteristics Comment RESERVED 2, 8, 2123, 25, 26, 2833, 4451, 53 NOTES 1. Keep all reserved and unused pins unconnected. 2. When VIO_SEL is grounded and VBAT 3.3 V, VDD_EXT = VBAT;

When VIO_SEL is grounded and VBAT 3.3 V, VDD_EXT = 3.3 V;

When VIO_SEL is floating, VDD_EXT = 1.8 V.

* means under development. 3. BC660K-GL_Hardware_Design 3-19 / 59 NB-IoT Module Series BC660K-GL Hardware Design 3.3. Operating Modes The following table describes the three working modes of the module briefly. Table 5: AP Operating Modes Mode Description Normal In normal mode, the AP handles tasks, such as AT command communication. Idle When all tasks are suspended, the AP will enter idle mode. Table 6: Modem Operating Modes Mode Description Connected DRX/eDRX PSM The network is connected and the module supports data transmission. In such a case, the modem can switch to DRX/eDRX mode. The modem is in idle mode, and downlink data can be received during PTW only. In such a case, the modem can switch to PSM or connected mode. In power saving mode, receive any downlink data. In such a case, the modem can switch to eDRX/DRX. the modem is disconnected from the network and cannot Table 7: Module Operating Modes Mode Description Active Light Sleep Deep Sleep When the AP is in normal mode or the modem is in connected mode, the module will be active and supports all services and functions. The current consumption in active mode is higher than that in sleep modes. Generally, when the AP is in idle mode and the modem is in DRX/eDRX mode, the module will enter Light Sleep mode. In such a case, the AP tasks will be suspended and the modem will be able to receive downlink data during PTW only. In Light Sleep mode, the current consumption of the module is reduced greatly. When the AP is in idle mode and the modem is idle or inactive, the module will enter deep sleep mode in which the CPU is powered off and only the 32 kHz RTC clock is working. In deep sleep mode, the current consumption will be reduced to the minimum (typical value: 800 nA). BC660K-GL_Hardware_Design 3-20 / 59 NB-IoT Module Series BC660K-GL Hardware Design Upon system requirement, there are several ways to drive the module to enter low current consumption status. In Light Sleep mode, the serial port does not work, and the module can be woken up through the falling edge of PSM_EINT. In this mode, the UART port is inactive and the module can be awakened through the main UART port. 3.4. Power Saving 3.4.1. Light Sleep 3.4.2. Deep Sleep The module consumes extremely low current in Deep Sleep mode (typical value: 800 nA). The main purpose of Deep Sleep is to reduce the power consumption of the module and prolong the power supply time of the battery. In Deep Sleep mode, the serial port does not work. The following figure shows the power consumption diagram of the module in different modes. Figure 3: Module Power Consumption in Different Modes (Modem) BC660K-GL_Hardware_Design 3-21 / 59 NB-IoT Module Series BC660K-GL Hardware Design When the modem remains in PSM and the AP is in idle mode, the module will enter deep sleep mode. The procedure of the modem entering PSM is as follows:

The modem requests to enable PSM in ATTACH REQUEST or TAU REQUEST message during ATTACH/TAU (Tracking Area Update) procedure. Then the network accepts the request and provides an active time value (T3324) to the modem and the mobile reachable timer starts. When the T3324 timer expires, the modem enters PSM for the duration of T3412 (periodic TAU timer). Please note that the module cannot request entering PSM when it is establishing an emergency attachment or initializing the PDN (Public Data Network) connection When the module is in deep sleep mode, it will be woken up in the following cases:

After the T3412 timer expires, the module will exit deep sleep automatically. Send an AT command to the module (this AT command will be lost), pull down the MAIN_RXD, and in falling edge, the module will be woken up from deep sleep. Pulling down PSM_EINT (falling edge) will wake up the module from deep sleep. The timing of waking up the module from PSM is illustrated below. Figure 4: Timing of Waking up Module from PSM 3.5. Power Supply 3.5.1. Power Supply Pins The module provides two VBAT pins for connection with an external power supply. The table below describes the module's VBAT and ground pins. BC660K-GL_Hardware_Design 3-22 / 59 NB-IoT Module Series BC660K-GL Hardware Design Table 8: Power Supply Pins Pin Name Pin No. Description Typ. Max. VBAT 42, 43 3.3 4.3 Power supply for the module Min. 2.2 Unit V GND GND 1, 27, 34, 36, 37, 40, 41, 56, 57, 58 3.5.2. Reference Design for Power Supply Power design for a module is critical to its performance. It is recommended to use a low quiescent current LDO with output current capacity of 0.5 A as the power supply for BC660K-GL. Lithium-thionyl chloride

(Li-SOCl2) batteries and Lithium manganese oxide (LiMn2O4) batteries can also be used as the power supply. The supply voltage of the module ranges from 2.2 V to 4.3 V. When the module is working, ensure its input voltage will never drop below 2.2 V; otherwise the module will be abnormal. For better power performance, it is recommended to place a 100 F tantalum capacitor with low ESR

(ESR = 0.7 ) and three ceramic capacitors (100 nF, 100 pF and 22 pF) near the VBAT pins. Also, it is recommended to add a TVS diode on the VBAT trace (near VBAT pins) to improve surge voltage withstand capability. In principle, the longer the VBAT trace is, the wider it should be. A reference circuit for power supply is illustrated in the following figure. Figure 5: Reference Circuit for Power Supply 3.5.3. Power Supply Voltage Detection*

You can use AT+CBC to monitor and query the current VBAT voltage. The unit of the voltage value is millivolt. For detailed information about the command, see document [2]. BC660K-GL_Hardware_Design 3-23 / 59 NB-IoT Module Series BC660K-GL Hardware Design NOTE

* means under development. 3.6. Power-up/Power-down Scenarios 3.6.1. Power-up After the module VBAT is powered on, keep the RESET_N and BOOT inputs not being pulled down, and the module can turn on automatically. The power-up timing is illustrated in the following figure. Figure 6: Power-up Timing NOTES 1. After the VBAT is powered down, its voltage must be lower than 0.7 V. The specific discharge time needs to be evaluated based on the actual circuit test, and enough margin is left to avoid abnormal startup when the it is powered on again. 2. The power-up time of VBAT must be within 10 ms. 3. It is recommended that the MCU retain the RESET_N control pin. When the abnormal power-on sequence causes the module to start abnormally, the RESET_N control pin can control the module to reset to exit the abnormal state. 4. After VBAT is powered on, RESET_N and BOOT automatically rise to high level due to internal pull-ups. BC660K-GL_Hardware_Design 3-24 / 59 NB-IoT Module Series BC660K-GL Hardware Design 3.6.2. Power-down The module can be shut down through disconnecting VBAT power supply. Figure 7: Power-down Timing 3.6.3. Reset Driving RESET_N low for at least 50 ms will reset the module. Table 9: Reset Pin Definition Pin Name Pin No. Description Reset Pull-down Time RESET_N 15 Reset the module. Active low. 50 ms The recommended circuits of resetting the module are shown below. An open drain/collector driver or button can be used to control the RESET_N pin. Figure 8: Reference Circuit of RESET_N by Using Driving Circuit BC660K-GL_Hardware_Design 3-25 / 59 NB-IoT Module Series BC660K-GL Hardware Design NOTES 1. When the high level output of RESET_CONTROL is more than 1.7 V and less than 3.6 V, and the low level output is less than 0.35 V, it is recommended to use the direct connection method to control the RESET_N pin of the module. In other cases, it must be controlled by an open collector drive circuit. It is recommended to reserve a 100 nF capacitor position, which is not mounted by default. 2. Figure 9: Reference Circuit of RESET_N by Using Button 3.6.4. Download In the process of system reset or power-on, keep the BOOT pin input low and the module will enter the download mode. In download mode, the firmware can be downloaded through the main serial port. After the download is complete, the module needs to be reset to exit the download mode. An open drain/collector driver or button can be used to control the BOOT pin. BC660K-GL_Hardware_Design 3-26 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 10: Reference Circuit of BOOT by Using Button NOTE If the BOOT pin is connected to a filter capacitor in parallel, the capacitance of the capacitor cannot be higher than 33 pF. 3.7. UART Interfaces The module provides two UART ports: main UART port and debug UART port. The module is designed as DCE (Data Communication Equipment), following the traditional DCE-DTE (Data Terminal Equipment) connection. Table 10: Pin Definition of UART Interfaces Interface Pin Name Pin No. Description Main UART Port Debug UART Port MAIN_TXD 17 Main UART transmit MAIN_RXD 18 Main UART receive DBG_RXD DBG_TXD 38 39 20 Debug UART receive Debug UART transmit Ring Indication RI*

Ring indication (when there is a SMS or a URC output, the module will inform DTE with the RI pin) BC660K-GL_Hardware_Design 3-27 / 59 NB-IoT Module Series BC660K-GL Hardware Design 3.7.1. Main UART Port The main UART port supports AT command communication, data transmission and firmware upgrade. Default baud rate: 115200 bps Fixed baud rates: 2400 bps, 4800 bps, 9600 bps, 19200 bps, 38400 bps, 57600 bps, 115200 bps, 230400 bps, 460800 bps When the port is used for firmware upgrade, the baud rate is 921600 bps by default. When the module enters Deep Sleep/Light Sleep mode, it can wake up the module by sending AT is generally recommended to send the command AT commands through the main serial port. continuously until OK is returned before sending AT commands to other services. It The figure below shows the connection between DCE and DTE. Figure 11: Reference Design for Main UART Port 3.7.2. Debug UART Port Through debug tools, the debug UART port can be used to output logs for firmware debugging. Its baud rate is 6 Mbps by default. The following is a reference design of debug UART port. Figure 12: Reference Design of Debug UART Port BC660K-GL_Hardware_Design 3-28 / 59 NB-IoT Module Series BC660K-GL Hardware Design 3.7.3. UART Application The serial port voltage domain of this module is optional. Customers can select the appropriate voltage domain through VIO_SEL according to the actual situation. When VIO_SEL is floating, the VDD_EXT voltage domain is 1.8 V; when VIO_SEL is grounded, the VDD_EXT voltage domain is 3.3 V. If the voltage domain of the customer application system is 1.8 V, VIO_SEL can be floating; If the voltage domain of the customer application system is 3.3 V, VIO_SEL can be grounded. The following figure shows the reference circuit design:

Figure 13: Reference Circuit Design of UART The following circuit shows a reference design for the communication between the module and a PC with standard RS-232 interface. Make sure to select appropriate voltage domain through VIO_SEL according to the actual situation. BC660K-GL_Hardware_Design 3-29 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 14: Sketch Map for RS-232 Interface Match Please visit vendors websites to select a suitable RS-232 transceiver, such as: http://www.exar.com and http://www.maximintegrated.com. NOTES 1. If the voltage domain of your application system is 1.8 V, keep the R1 marked in red not mounted; If the voltage domain of your application system is 3.3 V, keep the R1 marked in red mounted. 2. represents the test points of UART interfaces. It is also recommended to reserve the test points of VBAT, BOOT and RESET_N, for convenient firmware upgrade and debugging when necessary. 3. VDD_EXT cannot pull up the module MAIN_RXD directly. If VDD_EXT need pull up the module MAIN_RXD, you need to connect a Schottky diode in series first, and then pull up the module MAIN_RXD through a 4.7-20 k resistor. For more details, see document [3]. 4. When VIO_SEL is grounded and VBAT 3.3 V, VDD_EXT = VBAT;

When VIO_SEL is grounded and VBAT 3.3 V, VDD_EXT = 3.3 V;

When VIO_SEL is floating, VDD_EXT = 1.8 V. When the serial port voltage is neither 1.8 V nor 3.3 V, it is recommended to use a transistor level conversion circuit. The circuit design of dotted line section can refer to the design of solid line section, in terms of both module input and output circuit designs, but please pay attention to the direction of connection. BC660K-GL_Hardware_Design 3-30 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 15: Reference Circuit with Transistor Circuit NOTES 1. VDD_EXT cannot pull up MAIN_RXD directly. Due to the anti-backflow design of the MAIN_RXD pin, MAIN_RXD pin can be directly connected to the TXD of DTE in the 1.83.3 V voltage domain. If the Deep Sleep/Light Sleep mode wake-up function of the MAIN_RXD is enabled, it is recommended that MAIN_RXD does not use a level conversion circuit to avoid abnormal wake-up. If you choose the transistor conversion circuit, dont mount the R1 marked in red. If VDD_EXT need pull up the module MAIN_RXD, you need to connect a Schottky diode in series first, and then pull up the module MAIN_RXD through a 4.7-20 k resistor. For more details, see document [3]. 2. 3. 4. Transistor circuit solution is not suitable for applications with high baud rates exceeding 460 kbps. 3.8. (U)SIM Interface The (U)SIM card is powered by an internal regulator in the module. Both 1.8 V and 3.0 V (U)SIM cards are supported. Table 11: Pin Definition of (U)SIM Interface Pin Name Description Comment Pin No.

(U)SIM_VDD 14

(U)SIM card power supply When 3.0 V VBAT 4.3 V, support 1.8/3.0 V (U)SIM card;

When 2.2 V VBAT < 3 V, only support 1.8 V (U)SIM card;

Maximum supply current: about 80 mA. BC660K-GL_Hardware_Design 3-31 / 59 NB-IoT Module Series BC660K-GL Hardware Design

(U)SIM_CLK 13

(U)SIM card clock

(U)SIM_DATA 11

(U)SIM card data

(U)SIM_RST

(U)SIM card reset 12 10

(U)SIM_GND Specified ground for (U)SIM card A reference circuit design for (U)SIM interface with a 6-pin (U)SIM card connector is illustrated below. Figure 16: Reference Circuit for (U)SIM Interface with a 6-pin (U)SIM Card Connector To enhance the reliability and availability of the (U)SIM card in applications, follow the criteria below in

(U)SIM circuit design:

Keep the placement of (U)SIM card connector as close to the module as possible. Keep the trace length as less than 200 mm as possible. Keep (U)SIM card signals away from RF and VBAT traces. Assure the trace between the ground of the module and that of (U)SIM card connector is short and wide. Keep the trace width of the ground no less than 0.5 mm to maintain the same electric potential. The decoupling capacitor between (U)SIM_VDD and GND should be not more than 1 F and be placed close to the (U)SIM card connector. To avoid cross-talk between (U)SIM_DATA and (U)SIM_CLK, keep them away from each other and shield them separately with the surrounded ground. In order to offer good ESD protection, it is recommended to add a TVS diode array whose parasitic capacitance should be not more than 50 pF. The ESD protection device should be placed as close to

(U)SIM card connector as possible, and ensure the (U)SIM card signal lines go through the ESD protection device first from (U)SIM card connector and then to the module. The 22 resistors should be connected in series between the module and the (U)SIM card connector to suppress EMI spurious transmission and enhance ESD protection. Please note that the (U)SIM peripheral circuit should be BC660K-GL_Hardware_Design 3-32 / 59 NB-IoT Module Series BC660K-GL Hardware Design The pull-up resistor on the SIM_DATA line can improve anti-jamming capability and should be placed close to the (U)SIM card connector. close to the (U)SIM card connector. is necessary (U)SIM_DATA must add a 10 k pull-up resistor to (U)SIM_VDD to improve NOTE It anti-interference ability. 3.9. ADC Interface*

The module provides a 12-bit ADC input channel to read the voltage value. Table 12: Pin Definition of ADC Interface Pin Name Pin No. Description Sample Range ADC0 9 Analog to digital converter interface 01.2 V NOTES 1. 2. 320 k pull-down resistor is integrated inside the ADC pin. This resistor needs to be considered when calculating the resistor divider relationship.

* means under development. When there is a message received or a URC output, the module will notify DTE through the RI interface. 3.10. RI Interface*

Table 13: RI Signal Status Module Status RI Signal Level Standby High pulse URC When a URC is received, RI outputs 120 ms low pulse and starts data output. BC660K-GL_Hardware_Design 3-33 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 17: RI Behaviour When a URC is Received NOTE

* means under development. 3.11. NETLIGHT Interface*

NETLIGHT can be used to indicate the network status of the module. The following table illustrates the module status indicated by NETLIGHT. A reference circuit is shown as below. BC660K-GL_Hardware_Design 3-34 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 18: Reference Design of NETLIGHT NOTE

* means under development. BC660K-GL_Hardware_Design 3-35 / 59 NB-IoT Module Series BC660K-GL Hardware Design 4 Antenna Interface The pin 35 is the RF antenna pad. The antenna port has an impedance of 50 . 4.1. Pin Definition Table 14: Pin Definition of NB-IoT Antenna Interface Pin Name ANT_RF GND Pin No. 35 34, 36, 37 Description RF antenna interface Ground 4.2. Operating Frequencies Table 15: Module Operating Frequencies Frequency Band Receiving Frequency Transmitting Frequency B1 B2 B3 B4 B5 B8 B12 B13 21102170 MHz 19201980 MHz 19301990 MHz 18501910 MHz 18051880 MHz 17101785 MHz 21102155 MHz 17101755 MHz 869894 MHz 824849 MHz 925960 MHz 880915 MHz 729746 MHz 699716 MHz 746756 MHz 777787 MHz BC660K-GL_Hardware_Design 4-36 / 59 NB-IoT Module Series BC660K-GL Hardware Design B17 B18 B19 B20 B25 B28 B66 B70 B85 734746 MHz 704716 MHz 860875 MHz 815830 MHz 875890 MHz 830845 MHz 791821 MHz 832862 MHz 19301995 MHz 18501915 MHz 758803 MHz 703748 MHz 21102180 MHz 17101780 MHz 19952020 MHz 16951710 MHz 728746 MHz 698716 MHz 4.3. RF Antenna Reference Design BC660K-GL provides an RF antenna pin for external NB-IoT antenna connection. The RF trace on host PCB connected to the modules RF antenna pad should be coplanar waveguide or microstrip, whose characteristic impedance should be close to 50 . The module comes with ground pads which are next to the antenna pad to give a better grounding. In order to achieve better RF performance, it is recommended to reserve a type matching circuit and place the -type matching components (R1/C1/C2) as close to the antenna as possible. By default, the capacitors (C1/C2) are not mounted and a 0 resistor is mounted on R1. A reference design of the RF interface is shown as below. BC660K-GL_Hardware_Design 4-37 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 19: Reference Design of NB-IoT Antenna Interface 4.4. Reference Design of RF Layout For users PCB, the characteristic impedance of all RF traces should be controlled to 50 . The impedance of the RF traces is usually determined by the trace width (W), the materials dielectric constant, height from the reference ground to the signal layer (H), and the clearance between RF traces and grounds (S). Microstrip or coplanar waveguide is typically used in RF layout to control characteristic impedance. The following are reference designs of microstrip or coplanar waveguide with different PCB structures. Figure 20: Microstrip Design on a 2-layer PCB BC660K-GL_Hardware_Design 4-38 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 21: Coplanar Waveguide Design on a 2-layer PCB Figure 22: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground) Figure 23: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground) To ensure RF performance and reliability, the following principles should be complied with in RF layout design:

BC660K-GL_Hardware_Design 4-39 / 59 NB-IoT Module Series BC660K-GL Hardware Design Use an impedance simulation tool to accurately control the characteristic impedance of RF traces to The GND pins adjacent to RF pins should not be designed as thermal relief pads, and should be fully 50 . connected to ground. The distance between the RF pins and the RF connector should be as short as possible, and all the right-angle traces should be changed to curved ones. There should be clearance under the signal pin of the antenna connector or solder joint. The reference ground of RF traces should be complete. Meanwhile, adding some ground vias around RF traces and the reference ground could help to improve RF performance. The distance between the ground vias and RF traces should be no less than two times as wide as RF signal traces (2 W). For more details, see document [4]. 4.5. Antenna Requirements To minimize the loss on RF trace and RF cable, pay attention to the antenna design. The following tables show the requirements on NB-IoT antenna. Table 16: Antenna Cable Insertion Loss Requirements Band Requirements LTE B5/B8/B12/B13/B17/B18/B19/B20/B28/B85 Cable insertion loss: < 1 dB LTE B1/B2/B3/B4/B25/B66/B70 Cable insertion loss: < 1.5 dB Table 17: Required Antenna Parameters Parameters Requirements Frequency Range 6982200 MHz VSWR Efficiency Max Input Power (W) Input Impedance ()

> 30 %

2 50 50 BC660K-GL_Hardware_Design 4-40 / 59 NB-IoT Module Series BC660K-GL Hardware Design 4.6. RF Output Power Table 18: RF Conducted Output Power Frequency Band Max. 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB Min.

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm B1 B2 B3 B4 B5 B8 B12 B13 B17 B18 B19 B20 B25 B28 B66 B70 B85 NOTE The design conforms to the NB-IoT radio protocols in 3GPP Rel.13. BC660K-GL_Hardware_Design 4-41 / 59 NB-IoT Module Series BC660K-GL Hardware Design 4.7. RF Receiving Sensitivity Table 19: Receiving Sensitivity (with RF Retransmissions) Frequency Band Receiving Sensitivity B1 B2 B3 B4 B5 B8 B12 B13 B17 B18 B19 B20 B25 B28 B66 B70 B85

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm BC660K-GL_Hardware_Design 4-42 / 59 NB-IoT Module Series BC660K-GL Hardware Design 4.8. Recommended RF Connector for Antenna Installation If RF connector is used for antenna connection, it is recommended to use the U.FL-R-SMT connector provided by HIROSE. Figure 24: Dimensions of the U.FL-R-SMT Connector (Unit: mm) U.FL-LP serial connectors listed in the following figure can be used to match the U.FL-R-SMT. Figure 25: Mechanicals of U.FL-LP Connectors BC660K-GL_Hardware_Design 4-43 / 59 The following figure describes the space factor of mated connector. NB-IoT Module Series BC660K-GL Hardware Design Figure 26: Space Factor of Mated Connector (Unit: mm) For more details, please visit http://www.hirose.com. BC660K-GL_Hardware_Design 4-44 / 59 NB-IoT Module Series BC660K-GL Hardware Design 5 Reliability and Electrical Characteristics 5.1. Operating and Storage Temperatures The following table lists the operating and storage temperatures of the module. Table 20: Operation and Storage Temperatures Parameter Operating Temperature Range 1) Extended Temperature Range 2) Storage Temperature Range Min.

-35

-40

-40 Typ.

+25 Max.

+75

+85

+90 Unit C C C NOTES 1. 2. 3. 1) Within operating temperature range, the module is 3GPP compliant. 2) Within extended temperature range, the module remains the ability to establish and maintain functions such as SMS* and data transmission, without any unrecoverable malfunction. Radio spectrum and radio network will not be influenced, while one or more specifications, such as Pout, may exceed the specified tolerances of 3GPP. When the temperature returns to the normal operation temperature levels, the module will meet 3GPP specifications again.

* means under development. BC660K-GL_Hardware_Design 5-45 / 59 NB-IoT Module Series BC660K-GL Hardware Design 5.2. Current Consumption The table below lists the current consumption of BC660K-GL under different states. Table 21: Module Current Consumption (3.3 V VBAT Power Supply) AP Mode Modem Mode Min. Typ. Max. Unit AP Mode Modem Mode Min. Typ. Max. Unit eDRX = 40.96 s, PTW = 10.24 s, ECL = 0 Deep Sleep Idle PSM Light Sleep Idle

@ DRX = 1.28 s

@ DRX = 2.56 s Active 1) Normal Single-tone

(15 kHz subcarrier spacing)

0.8 38 220 110 111 108 100 100 98 105 120 100 115 94

300 305 280 277 270 299 332 283 325 265 A A A A mA mA mA mA mA mA mA mA mA mA B1 @ 23dBm B2 @ 23 dBm B3 @ 23 dBm B4 @ 23 dBm B5 @ 23 dBm B8 @ 23 dBm B12 @ 23 dBm B13 @ 23 dBm B17 @ 23 dBm B18 @ 23 dBm AP Mode Modem Mode Min. Typ. Max. 2) Unit BC660K-GL_Hardware_Design 5-46 / 59 NB-IoT Module Series BC660K-GL Hardware Design 95 98 108 109 101 104 115 240 230 213 212 202 221 259 218 252 199 201 207 232 240 213 216 252 270 272 301 310 280 276 329 311 296 274 273 263 298 328 279 325 258 260 267 297 306 274 273 323 mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA B19 @ 23 dBm B20 @ 23 dBm B25 @ 23 dBm B28 @ 23 dBm B66 @ 23 dBm B70 @ 23 dBm B85 @ 23 dBm B1 @ 23 dBm B2 @ 23 dBm B3 @ 23 dBm B4 @ 23 dBm B5 @ 23 dBm B8 @ 23 dBm B12 @ 23 dBm B13 @ 23 dBm B19 @ 23 dBm B20 @ 23 dBm B25 @ 23 dBm B28 @ 23 dBm B66 @ 23 dBm B70 @ 23 dBm B85 @ 23 dBm

Single-tone

(3.75 kHz subcarrier spacing) B17 @ 23 dBm B18 @ 23 dBm BC660K-GL_Hardware_Design 5-47 / 59 NB-IoT Module Series BC660K-GL Hardware Design NOTES 1. 2. 1) Power consumption under instrument test condition. 2) The maximum value in Active mode refers to the maximum pulse current during RF emission. 5.3. Electrostatic Discharge The module is not protected against electrostatics discharge (ESD) in general. Consequently, it is subject to ESD handling precautions that typically apply to ESD sensitive components. Proper ESD handling and the processing, handling and operation of any packaging procedures must be applied throughout application that incorporates the module. The following table shows the modules electrostatic discharge characteristics. Table 22: Electrostatic Discharge Characteristics (25 C, 45 % Relative Humidity) Tested Interfaces Contact Discharge Air Discharge Unit VBAT, GND Antenna interface 5 5 Other interfaces 0.5 10 10 1 kV kV kV BC660K-GL_Hardware_Design 5-48 / 59 NB-IoT Module Series BC660K-GL Hardware Design 6 Mechanical Features This chapter describes the mechanical dimensions of millimeter (mm), and the dimensional tolerances are 0.05 mm unless otherwise specified. the module. All dimensions are measured in 6.1. Mechanical Dimensions 15.8 0.15 14.15 0.15 2.0 0.2 Pin 1 7 0

. 5 1 0

. 7 7 1

. 5 1 0

. 5 0 6 1 Figure 27: BC660K-GL Top and Side Dimensions (Unit: mm) 0.6 0.1 BC660K-GL_Hardware_Design 6-49 / 59 NB-IoT Module Series BC660K-GL Hardware Design 15.8 0.15 4.4 4.3 7 0

. 5 2 2

. Pin 1 8 1

. 1.0 9 1

. 1.1 4.4 3.5 5 3 4

. 7 3

. 5 1 0 7 7 1

. 7 0

. 1.5 Figure 28: Module Bottom Dimension (Bottom View) NOTE The package warpage level of the module conforms to JEITA ED-7306 standard. BC660K-GL_Hardware_Design 6-50 / 59 6.2. Recommended Footprint NB-IoT Module Series BC660K-GL Hardware Design 18.100.15 15.800.15 0.35 36 4.35 1.80 1.00 0.35 1.80 17.700.15 20.000.15 1 Pin 1 1.10 6.10 1.00 1.00 6.15 23 0.35 14 2.50 4.30 Figure 29: Recommended Footprint (Unit: mm) 0.70 NOTE For easy maintenance of the module, it is recommended to keep about 3 mm between the module and other components on the motherboard. BC660K-GL_Hardware_Design 6-51 / 59 6.3. Top and Bottom Views NB-IoT Module Series BC660K-GL Hardware Design Figure 30: Top View of the Module Figure 31: Bottom View of the Module NOTE Images above are for illustration purpose only and may differ from the actual module. For authentic appearance and label, please refer to the module received from Quectel. BC660K-GL_Hardware_Design 6-52 / 59 NB-IoT Module Series BC660K-GL Hardware Design 7 Storage, Manufacturing and Packaging 7.1. Storage The module is provided with vacuum-sealed packaging. MSL of the module is rated as 3. The storage requirements are shown below. 1. Recommended Storage Condition: The temperature should be 23 5 C and the relative humidity should be 3560 %. 2. The storage life (in vacuum-sealed packaging) is 12 months in Recommended Storage Condition. 3. The floor life of the module is 168 hours 1) in a plant where the temperature is 23 5 C and relative humidity is below 60 %. After the vacuum-sealed packaging is removed, the module must be processed in reflow soldering or other high-temperature operations within 168 hours. Otherwise, the module should be stored in an environment where the relative humidity is less than 10 % (e.g. a drying cabinet). 4. The module should be pre-baked to avoid blistering, cracks and inner-layer separation in PCB under the following circumstances:

The module is not stored in Recommended Storage Condition;

Violation of the third requirement above occurs;

Vacuum-sealed packaging is broken, or the packaging has been removed for over 24 hours;

Before module repairing. 5. If needed, the pre-baking should follow the requirements below:

The module should be baked for 8 hours at 120 5 C;

All modules must be soldered to PCB within 24 hours after the baking, otherwise they should be put in a dry environment such as in a drying oven. BC660K-GL_Hardware_Design 7-53 / 59 NB-IoT Module Series BC660K-GL Hardware Design NOTES 1) This floor life is only applicable when the environment conforms to IPC/JEDEC J-STD-033. 1. 2. To avoid blistering, layer separation and other soldering issues, it is forbidden to expose the modules to the air for a long time. If the temperature and moisture do not conform to IPC/JEDEC J-STD-033 or the relative moisture is over 60%, It is recommended to start the solder reflow process within 24 hours after the package is removed. And do not remove the packages of tremendous modules if they are not ready for soldering. 3. Please take the module out of the packaging and put it on high-temperature resistant fixtures before If shorter baking time is desired, please refer to IPC/JEDEC J-STD-033 for baking the baking. procedure. 7.2. Manufacturing and Soldering Push the squeegee to apply the solder paste on the surface of stencil, thus making the paste fill the stencil openings and then penetrate to the PCB. The force on the squeegee should be adjusted properly so as to produce a clean stencil surface on a single pass. To ensure the module soldering quality, the thickness of stencil for the module is recommended to be 0.150.18 mm. For more details, see document [5]. It is suggested that the peak reflow temperature is 238245 C, and the absolute maximum reflow temperature is 245 C. To avoid damage to the module caused by repeated heating, it is strongly recommended that the module should be mounted after reflow soldering for the other side of PCB has been completed. The recommended reflow soldering thermal profile (lead-free reflow soldering) and related parameters are shown below. Figure 32: Recommended Reflow Soldering Thermal Profile BC660K-GL_Hardware_Design 7-54 / 59 Table 23: Recommended Thermal Profile Parameters NB-IoT Module Series BC660K-GL Hardware Design Soak time (between A and B: 150C and 200C) 70120 s Factor Soak Zone Max slope Reflow Zone Max slope Reflow time (D: over 220C) Max temperature Cooling down slope Reflow Cycle Max reflow cycle NOTES Recommendation 13 C/s 23 C/s 4570 s 238 to 246 C

-1.5 to -3 C/s 1 1. During manufacturing and soldering, or any other processes that may contact the module directly, NEVER wipe the modules shielding can with organic solvents, such as acetone, ethyl alcohol, isopropyl alcohol, trichloroethylene, etc. Otherwise, the shielding can may become rusted. 2. The shielding can for the module is made of Cupro-Nickel base material. It is tested that after 12 hours Neutral Salt Spray test, the laser engraved label information on the shielding can is still clearly identifiable and the QR code is still readable, although white rust may be found. If a conformal coating is necessary for the module, do NOT use any coating material that may chemically react with the PCB or shielding cover, and prevent the coating material from flowing into the module. 3. 7.3. Tape and Reel Packaging The modules are stored in a vacuum-sealed bag which is ESD-proof. The bag should not be opened until the devices are ready to be soldered onto the application. The reel is 330 mm in diameter and each reel contains 250 modules. BC660K-GL_Hardware_Design 7-55 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 33: Tape Dimensions (Unit: mm) Figure 34: Reel Dimensions (Unit: mm) BC660K-GL_Hardware_Design 7-56 / 59 NB-IoT Module Series BC660K-GL Hardware Design 8 Appendix A References Table 24: Related Documents SN Document Name Description

[1]

Quectel_BC660K-GL-TE-B_User_Guide BC660K-GL-TE-B User Guide

[2]

Quectel_BC660K-GL_AT_Commands_Manual BC660K-GL AT Commands Manual

[3]

Quectel_BC660K-GL_Reference_Design BC660K-GL Reference Design

[4]

Quectel_RF_Layout_Application_Note RF Layout Application Note

[5]

Quectel_Module_Secondary_SMT_User_Guide Module Secondary SMT User Guide Table 25: Terms and Abbreviations Abbreviation Description ADC DCE DRX DTE DTLS eDRX EMI ESD Analog-to-Digital Converter Data Communications Equipment (typically module) Discontinuous Reception Data Terminal Equipment (typically computer, external controller) Datagram Transport Layer Security extended Discontinuous Reception Electromagnetic Interference Electrostatic Discharge H-FDD Half Frequency Division Duplexing HTTP Hyper Text Transfer Protocol HTTPS Hyper Text Transfer Protocol over Secure Socket Layer BC660K-GL_Hardware_Design 57 / 59 NB-IoT Module Series BC660K-GL Hardware Design LwM2M Lightweight M2M MQTT Message Queuing Telemetry Transport NB-IoT Narrow Band- Internet of Things I/O kbps LED LTE PCB PDU PSM PTW RF RTC RXD SMS TCP TE TLS TXD UDP URC Input/Output Kilo Bits Per Second Light Emitting Diode Long Term Evolution Printed Circuit Board Protocol Data Unit Power Save Mode Paging Time Window Radio Frequency Real Time Clock Receive Data Short Message Service Transmission Control Protocol Terminal Equipment Transport Layer Security Transmitting Data User Datagram Protocol Unsolicited Result Code UART Universal Asynchronous Receiver & Transmitter

(U)SIM Universal Subscriber Identification Module VSWR Voltage Standing Wave Ratio Vmax Maximum Voltage Value BC660K-GL_Hardware_Design 58 / 59 NB-IoT Module Series BC660K-GL Hardware Design Vnorm Normal Voltage Value Vmin Minimum Voltage Value VIHmax Maximum Input High Level Voltage Value VIHmin VILmax VILmin VImax Minimum Input High Level Voltage Value Maximum Input Low Level Voltage Value Minimum Input Low Level Voltage Value Absolute Maximum Input Voltage Value VInorm Absolute Normal Input Voltage Value VImin Absolute Minimum Input Voltage Value VOHmax Maximum Output High Level Voltage Value VOHmin Minimum Output High Level Voltage Value VOLmax Maximum Output Low Level Voltage Value VOLmin Minimum Output Low Level Voltage Value Installation engineers need to be aware of the potential risk of the thermal effects of radio frequency energy and how to stay protected against undue risk. The EUT is a mobile device; maintain at least a 20 cm separation between the EUT and the user's body and must not transmit simultaneously with any other antenna or transmitter. BC660K-GL_Hardware_Design 59 / 59 OEM/Integrators Installation Manual Important Notice to OEM integrators 1. This module is limited to OEM installation ONLY. 2. This module is limited to installation in mobile or fixed applications, according to Part 2.1091(b). 3. The separate approval is required for all other operating configurations, including portable configurations with respect to Part 2.1093 and different antenna configurations 4. For FCC Part 15.31 (h) and (k): The host manufacturer is responsible for additional testing to verify compliance as a composite system. When testing the host device for compliance with Part 15 Subpart B, the host manufacturer is required to show compliance with Part 15 Subpart B while the transmitter module(s) are installed and operating. The modules should be transmitting and the evaluation should confirm that the module's intentional emissions are compliant (i.e. fundamental and out of band emissions). The host manufacturer must verify that there are no additional unintentional emissions other than what is permitted in Part 15 Subpart B or emissions are complaint with the transmitter(s) rule(s). The Grantee will provide guidance to the host manufacturer for Part 15 B requirements if needed. Important Note notice that any deviation(s) from the defined parameters of the antenna trace, as described by the instructions, require that the host product manufacturer must notify to Quectel that they wish to change the antenna trace design. In this case, a Class II permissive change application is required to be filed by the USI, or the host manufacturer can take responsibility through the change in FCC ID (new application) procedure followed by a Class II permissive change application End Product Labeling When the module is installed in the host device, the FCC/IC ID label must be visible through a window on the final device or it must be visible when an access panel, door or cover is easily re-moved. If not, a second label must be placed on the outside of the final device that contains the following text: Contains FCC ID: XMR2021BC660KGL Contains IC: 10224A-2021BC660GL . The FCC ID/IC ID can be used only when all FCC/IC compliance requirements are met. Antenna authorization.

(1) The antenna must be installed such that 20 cm is maintained between the antenna and users,

(2) The transmitter module may not be co-located with any other transmitter or antenna. In the event that these conditions cannot be met (for example certain laptop configurations or co-location with another transmitter), then the FCC/IC authorization is no longer considered valid and the FCC ID/IC ID cannot be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate FCC/IC To comply with FCC regulations limiting both maximum RF output power and human exposure to RF radiation, maximum antenna gain (including cable loss) must not exceed Test Mode Antenna Gain (dBi) Test Mode Antenna Gain (dBi) NB-IoT Band 2 NB-IoT Band 4*

NB-IoT Band 5 NB-IoT Band 12 NB-IoT Band 13 8.00 8.00 5.00 5.00 5.00 NB-IoT Band 17 NB-IoT Band 25 NB-IoT Band 66*

NB-IoT Band 85 5.00 8.00 8.00 5.00 Note: * means when using these max gain antenna, the host manufacturer should reduce the conducted power to meet the FCC maximum RF output power limit. Manual Information to the End User The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the users manual of the end product which integrates this module. The end user manual shall include all required regulatory information/warning as show in this manual Federal Communication Commission Interference Statement This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

(1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:

- Reorient or relocate the receiving antenna.

- Increase the separation between the equipment and receiver

- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

- Consult the dealer or an experienced radio/TV technician for help. Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. List of applicable FCC rules This module has been tested and found to comply with part 22, part 24, part 27, part 90 requirements for Modular Approval. The modular transmitter is only FCC authorized for the specific rule parts (i.e., FCC transmitter rules) listed on the grant, and that the host product manufacturer is responsible for compliance to any other FCC rules that apply to the host not covered by the modular transmitter grant of certification. If the grantee markets their product as being Part 15 Subpart B compliant (when it also contains unintentional-

radiator digital circuity), then the grantee shall provide a notice stating that the final host product still requires Part 15 Subpart B compliance testing with the modular transmitter installed. This device is intended only for OEM integrators under the following conditions: (For module device use) 1) The antenna must be installed such that 20 cm is maintained between the antenna and users, and 2) The transmitter module may not be co-located with any other transmitter or antenna. As long as 2 conditions above are met, further transmitter test will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed. Radiation Exposure Statement your body. This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20 cm between the radiator &

Industry Canada Statement This device complies with Industry Canadas licence-exempt RSSs. Operation is subject to the following

(1) This device may not cause interference; and

(2) This device must accept any interference, including interference that may cause undesired operation two conditions:

of the device. Le prsent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorise aux deux conditions suivantes:

(1) l'appareil ne doit pas produire de brouillage, et

(2) l'utilisateur de l'appareil doit accepter tout brouillage radiolectrique subi, mme si le brouillage est susceptible d'en compromettre le fonctionnement."

Radiation Exposure Statement body Dclaration d'exposition aux radiations:

This equipment complies with IC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20 cm between the radiator & your Cet quipement est conforme aux limites d'exposition aux rayonnements ISED tablies pour un environnement non contrl. Cet quipement doit tre install et utilis avec un minimum de 20 cm de distance entre la source de rayonnement et votre corps. This device is intended only for OEM integrators under the following conditions: (For module device use) 1) The antenna must be installed such that 20 cm is maintained between the antenna and users, and 2) The transmitter module may not be co-located with any other transmitter or antenna. As long as 2 conditions above are met, further transmitter test will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed. Cet appareil est conu uniquement pour les intgrateurs OEM dans les conditions suivantes: (Pour utilisation de dispositif module) 1) L'antenne doit tre installe de telle sorte qu'une distance de 20 cm est respecte entre l'antenne et les utilisateurs, et 2) Le module metteur peut ne pas tre complant avec un autre metteur ou antenne. Tant que les 2 conditions ci-dessus sont remplies, des essais supplmentaires sur l'metteur ne seront pas ncessaires. Toutefois, l'intgrateur OEM est toujours responsable des essais sur son produit final pour toutes exigences de conformit supplmentaires requis pour ce module install. IMPORTANT NOTE:

In the event that these conditions cannot be met (for example certain laptop configurations or colocation with another transmitter), then the Canada authorization is no longer considered valid and the IC ID cannot be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate Canada authorization. NOTE IMPORTANTE:

Dans le cas o ces conditions ne peuvent tre satisfaites (par exemple pour certaines configurations d'ordinateur portable ou de certaines co-localisation avec un autre metteur), l'autorisation du Canada n'est plus considr comme valide et l'ID IC ne peut pas tre utilis sur le produit final. Dans ces circonstances, l'intgrateur OEM sera charg de rvaluer le produit final (y compris l'metteur) et l'obtention d'une autorisation distincte au Canada. End Product Labeling This transmitter module is authorized only for use in device where the antenna may be installed such that 20 cm may be maintained between the antenna and users. The final end product must be labeled in a visible area with the following: Contains IC: 10224A-2021BC660GL. Plaque signaltique du produit final Ce module metteur est autoris uniquement pour une utilisation dans un dispositif o l'antenne peut tre installe de telle sorte qu'une distance de 20cm peut tre maintenue entre l'antenne et les utilisateurs. Le produit final doit tre tiquet dans un endroit visible avec l'inscription suivante: "Contient des IC: 10224A-2021BC660GL ". Manual Information to the End User The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the users manual of the end product which integrates this module. The end user manual shall include all required regulatory information/warning as show in this manual. Manuel d'information l'utilisateur final L'intgrateur OEM doit tre conscient de ne pas fournir des informations l'utilisateur final quant la faon d'installer ou de supprimer ce module RF dans le manuel de l'utilisateur du produit final qui intgre ce module. Le manuel de l'utilisateur final doit inclure toutes les informations rglementaires requises et avertissements comme indiqu dans ce manuel.

BC660K-GL Hardware Design NB-IoT Module Series Version: 1.0.0 Date: 2020-11-20 Status: Preliminary www.quectel.com NB-IoT Module Series BC660K-GL Hardware Design Our aim is to provide customers with timely and comprehensive service. For any assistance, please contact our company headquarters:

Quectel Wireless Solutions Co., Ltd. Building 5, Shanghai Business Park Phase III (Area B), No.1016 Tianlin Road, Minhang District, Shanghai 200233, China Tel: +86 21 5108 6236 Email: info@quectel.com Or our local office. For more information, please visit:

http://www.quectel.com/support/sales.htm. For technical support, or to report documentation errors, please visit:

http://www.quectel.com/support/technical.htm Or email to support@quectel.com. General Notes Quectel offers the information as a service to its customers. The information provided is based upon customers requirements. Quectel makes every effort to ensure the quality of the information it makes available. Quectel does not make any warranty as to the information contained herein, and does not accept any liability for any injury, loss or damage of any kind incurred by use of or reliance upon the information. All information supplied herein is subject to change without prior notice. Disclaimer While Quectel has made efforts to ensure that the functions and features under development are free from errors, it is possible that these functions and features could contain errors, inaccuracies and omissions. Unless otherwise provided by valid agreement, Quectel makes no warranties of any kind, implied or express, with respect to the use of features and functions under development. To the maximum extent permitted by law, Quectel excludes all liability for any loss or damage suffered in connection with the use of the functions and features under development, regardless of whether such loss or damage may have been foreseeable. Duty of Confidentiality The Receiving Party shall keep confidential all documentation and information provided by Quectel, except when the specific permission has been granted by Quectel. The Receiving Party shall not access or use Quectels documentation and information for any purpose except as expressly provided herein. Furthermore, the Receiving Party shall not disclose any of the Quectel's documentation and information to any third party without the prior written consent by Quectel. For any noncompliance to the above requirements, unauthorized use, or other illegal or malicious use of the documentation and information, Quectel will reserve the right to take legal action. BC660K-GL_Hardware_Design 1 / 59 NB-IoT Module Series BC660K-GL Hardware Design Copyright The information contained here is proprietary technical information of Quectel wireless solutions co., ltd. Transmitting, reproducing, disseminating and editing this document as well as using the content without permission are forbidden. Offenders will be held liable for payment of damages. All rights are reserved in the event of a patent grant or registration of a utility model or design. Copyright Quectel Wireless Solutions Co., Ltd. 2020. All rights reserved. BC660K-GL_Hardware_Design 2 / 59 NB-IoT Module Series BC660K-GL Hardware Design About the Document Revision History Version Date Author Description

2020-09-30 Creation of the document 1.0.0 2020-11-20 Preliminary Clifton HE/

Ellison WANG/

Randy LI Clifton HE/

Ellison WANG/

Randy LI BC660K-GL_Hardware_Design 3 / 59 NB-IoT Module Series BC660K-GL Hardware Design Contents About the Document................................................................................................................................................. 3 Contents....................................................................................................................................................................... 4 Table Index.................................................................................................................................................................. 6 Figure Index.................................................................................................................................................................7 1 2 3 Introduction......................................................................................................................................................... 8 Safety Information....................................................................................................................................9 1.1. Product Concept..............................................................................................................................................10 2.1. General Description...............................................................................................................................10 Key Features.......................................................................................................................................... 11 2.2. Functional Diagram............................................................................................................................... 12 2.3. Evaluation Board....................................................................................................................................13 2.4. 3.6. 3.5. 3.4.1. 3.4.2. 3.5.1. 3.5.2. 3.5.3. Application Interfaces.................................................................................................................................... 14 Pin Assignment...................................................................................................................................... 15 3.1. Pin Description....................................................................................................................................... 16 3.2. 3.3. Operating Modes................................................................................................................................... 20 Power Saving......................................................................................................................................... 21 3.4. Light Sleep..................................................................................................................................21 Deep Sleep.................................................................................................................................21 Power Supply......................................................................................................................................... 22 Power Supply Pins....................................................................................................................22 Reference Design for Power Supply......................................................................................23 Power Supply Voltage Detection*.......................................................................................... 23 Power-up/Power-down Scenarios...................................................................................................... 24 Power-up.................................................................................................................................... 24 Power-down............................................................................................................................... 25 Reset........................................................................................................................................... 25 Download....................................................................................................................................26 3.7. UART Interfaces.................................................................................................................................... 27 3.7.1. Main UART Port........................................................................................................................ 28 Debug UART Port..................................................................................................................... 28 3.7.2. UART Application......................................................................................................................29 3.7.3.

(U)SIM Interface.....................................................................................................................................31 3.8. ADC Interface*....................................................................................................................................... 33 3.9. 3.10. RI Interface*............................................................................................................................................33 3.11. NETLIGHT Interface*............................................................................................................................34 3.6.1. 3.6.2. 3.6.3. 3.6.4. 4 Antenna Interface............................................................................................................................................ 36 Pin Definition.......................................................................................................................................... 36 4.1. 4.2. Operating Frequencies......................................................................................................................... 36 4.3. RF Antenna Reference Design........................................................................................................... 37 BC660K-GL_Hardware_Design 4 / 59 NB-IoT Module Series BC660K-GL Hardware Design 4.4. Reference Design of RF Layout..........................................................................................................38 Antenna Requirements......................................................................................................................... 40 4.5. 4.6. RF Output Power................................................................................................................................... 41 4.7. RF Receiving Sensitivity.......................................................................................................................42 4.8. Recommended RF Connector for Antenna Installation.................................................................. 43 Reliability and Electrical Characteristics..................................................................................................45 5.1. Operating and Storage Temperatures............................................................................................... 45 5.2. Current Consumption............................................................................................................................46 Electrostatic Discharge......................................................................................................................... 48 5.3. 6 Mechanical Features.......................................................................................................................................49 6.1. Mechanical Dimensions........................................................................................................................49 6.2. Recommended Footprint......................................................................................................................51 Top and Bottom Views..........................................................................................................................52 6.3. Storage, Manufacturing and Packaging....................................................................................................53 Storage.................................................................................................................................................... 53 7.1. 7.2. Manufacturing and Soldering...............................................................................................................54 Tape and Reel Packaging....................................................................................................................55 7.3. 8 Appendix A References................................................................................................................................. 57 5 7 BC660K-GL_Hardware_Design 5 / 59 NB-IoT Module Series BC660K-GL Hardware Design Table Index Table 1: Frequency Bands of BC660K-GL............................................................................................................10 Table 2: BC660K-GL Key Features........................................................................................................................11 Table 3: I/O Parameters Definition......................................................................................................................... 16 Table 4: Pin Description........................................................................................................................................... 16 Table 5: AP Operating Modes................................................................................................................................. 20 Table 6: Modem Operating Modes......................................................................................................................... 20 Table 7: Module Operating Modes......................................................................................................................... 20 Table 8: Power Supply Pins.....................................................................................................................................23 Table 9: Reset Pin Definition................................................................................................................................... 25 Table 10: Pin Definition of UART Interfaces......................................................................................................... 27 Table 11: Pin Definition of (U)SIM Interface......................................................................................................... 31 Table 12: Pin Definition of ADC Interface..............................................................................................................33 Table 13: RI Signal Status....................................................................................................................................... 33 Table 14: Pin Definition of NB-IoT Antenna Interface......................................................................................... 36 Table 15: Module Operating Frequencies.............................................................................................................36 Table 16: Antenna Cable Insertion Loss Requirements..................................................................................... 40 Table 17: Required Antenna Parameters..............................................................................................................40 Table 18: RF Conducted Output Power................................................................................................................ 41 Table 19: Receiving Sensitivity (with RF Retransmissions)...............................................................................42 Table 20: Operation and Storage Temperatures................................................................................................. 45 Table 21: Module Current Consumption (3.3 V VBAT Power Supply).............................................................46 Table 22: Electrostatic Discharge Characteristics (25 C, 45 % Relative Humidity)..................................... 48 Table 23: Recommended Thermal Profile Parameters...................................................................................... 55 Table 24: Related Documents.................................................................................................................................57 Table 25: Terms and Abbreviations....................................................................................................................... 57 BC660K-GL_Hardware_Design 6 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure Index Figure 1: Functional Diagram.................................................................................................................................. 13 Figure 2: Pin Assignment......................................................................................................................................... 15 Figure 3: Module Power Consumption in Different Modes (Modem)............................................................... 21 Figure 4: Timing of Waking up Module from PSM............................................................................................... 22 Figure 5: Reference Circuit for Power Supply...................................................................................................... 23 Figure 6: Power-up Timing.......................................................................................................................................24 Figure 7: Power-down Timing..................................................................................................................................25 Figure 8: Reference Circuit of RESET_N by Using Driving Circuit...................................................................25 Figure 9: Reference Circuit of RESET_N by Using Button................................................................................ 26 Figure 10: Reference Circuit of BOOT by Using Button..................................................................................... 27 Figure 11: Reference Design for Main UART Port.............................................................................................. 28 Figure 12: Reference Design of Debug UART Port............................................................................................ 28 Figure 13: Reference Circuit Design of UART..................................................................................................... 29 Figure 14: Sketch Map for RS-232 Interface Match............................................................................................ 30 Figure 15: Reference Circuit with Transistor Circuit............................................................................................31 Figure 16: Reference Circuit for (U)SIM Interface with a 6-pin (U)SIM Card Connector..............................32 Figure 17: RI Behaviour When a URC is Received.............................................................................................34 Figure 18: Reference Design of NETLIGHT......................................................................................................... 35 Figure 19: Reference Design of NB-IoT Antenna Interface............................................................................... 38 Figure 20: Microstrip Design on a 2-layer PCB....................................................................................................38 Figure 21: Coplanar Waveguide Design on a 2-layer PCB................................................................................39 Figure 22: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground).......................39 Figure 23: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground).......................39 Figure 24: Dimensions of the U.FL-R-SMT Connector (Unit: mm)................................................................... 43 Figure 25: Mechanicals of U.FL-LP Connectors.................................................................................................. 43 Figure 26: Space Factor of Mated Connector (Unit: mm).................................................................................. 44 Figure 27: BC660K-GL Top and Side Dimensions (Unit: mm)..........................................................................49 Figure 28: Module Bottom Dimension (Bottom View)......................................................................................... 50 Figure 29: Recommended Footprint (Unit: mm)...................................................................................................51 Figure 30: Top View of the Module.........................................................................................................................52 Figure 31: Bottom View of the Module...................................................................................................................52 Figure 32: Recommended Reflow Soldering Thermal Profile........................................................................... 54 Figure 33: Tape Dimensions (Unit: mm)................................................................................................................56 Figure 34: Reel Dimensions (Unit: mm)................................................................................................................ 56 BC660K-GL_Hardware_Design 7 / 59 NB-IoT Module Series BC660K-GL Hardware Design 1 Introduction This document defines the BC660K-GL module and describes its air interfaces and hardware interface which are connected with the customers applications. This document helps customers quickly understand the interface specifications, electrical and mechanical details, as well as other related information of the module. To facilitate application designs, it also includes some reference designs for customers reference. The document, coupled with application notes and user guides, makes it easy to design and set up mobile applications with BC660K-GL. BC660K-GL_Hardware_Design 1-8 / 59 NB-IoT Module Series BC660K-GL Hardware Design 1.1. Safety Information The following safety precautions must be observed during all phases of operation, such as usage, service or repair of any cellular terminal or mobile incorporating the module. Manufacturers of the cellular terminal should notify users and operating personnel of the following safety information by incorporating these guidelines into all manuals of the product. Otherwise, Quectel assumes no liability for customers failure to comply with these precautions. Full attention must be paid to driving at all times in order to reduce the risk of an accident. Using a mobile while driving (even with a handsfree kit) causes distraction and can lead to an accident. Please comply with laws and regulations restricting the use of wireless devices while driving. Switch off the cellular terminal or mobile before boarding an aircraft. The operation of wireless appliances in an aircraft interference with communication systems. If there is an Airplane Mode, it should be enabled prior to boarding an aircraft. Please consult the airline staff for more restrictions on the use of wireless devices on an aircraft. is forbidden to prevent Wireless devices may cause interference on sensitive medical equipment, so please be aware of the restrictions on the use of wireless devices when in hospitals, clinics or other healthcare facilities. Cellular terminals or mobiles operating over radio signals and cellular network cannot be guaranteed to connect in all possible conditions (for example, with unpaid bills or with an invalid (U)SIM card). When emergency help is needed in such conditions, please remember using emergency call. In order to make or receive a call, the cellular terminal or mobile must be switched on in a service area with adequate cellular signal strength. The cellular terminal or mobile contains a transmitter and receiver. When it is ON, it receives and transmits radio frequency signals. RF interference can occur if it is used close to TV set, radio, computer or other electric equipment. In locations with potentially explosive atmospheres, obey all posted signs to turn off wireless devices such as mobile phone or other cellular terminals. Areas with potentially explosive atmospheres include fuelling areas, below decks on boats, fuel or chemical transfer or storage facilities, areas where the air contains chemicals or particles such as grain, dust or metal powders, etc. BC660K-GL_Hardware_Design 1-9 / 59 NB-IoT Module Series BC660K-GL Hardware Design 2 Product Concept 2.1. General Description BC660K-GL is a high-performance NB-IoT module with extremely low power consumption. It is designed to communicate with infrastructures of mobile network operators through NB-IoT radio protocols (3GPP Rel-13 and 3GPP Rel-14). BC660K-GL supports a broad range of frequency bands as listed below. Table 1: Frequency Bands of BC660K-GL Mode BC660K-GL H-FDD B1/B2/B3/B4/B5/B8/B12/B13/B14/B17/B18/B19/B20/B25/B28/B66/B70/B85 BC660K-GL is an SMD type module with LCC and LGA package, and has an ultra-compact profile of 17.7 mm 15.8 mm 2.0 mm, which makes it easily embedded into size-constrained applications and provide reliable connectivity with the applications. BC660K-GL provides abundant external

(UDP/TCP/LwM2M*/MQTT*, etc.), which provide great convenience for customers' applications. interfaces (UART, ADC, (U)SIM, etc) and protocol stacks Due to compact form factor, ultra-low power consumption and extended temperature range, BC660K-GL is a best choice for a wide range of IoT applications, such as smart metering, bike sharing, smart wearables, smart parking, smart city, home appliances, security and asset tracking, agricultural and environmental monitoring, etc. It is able to provide a complete range of SMS* and data transmission services to meet customers demands. The module fully complies with the RoHS directive of the European Union. NOTE

* means under development. BC660K-GL_Hardware_Design 2-10 / 59 NB-IoT Module Series BC660K-GL Hardware Design 2.2. Key Features The following table describes the detailed features of BC660K-GL module. Table 2: BC660K-GL Key Features Feature Details Power Supply Supply voltage: 2.24.3 V Typical supply voltage: 3.3 V Power Saving Typical power consumption: 800 nA Frequency Bands LTE Cat NB2:

B1/B2/B3/B4/B5/B8/B12/B13/B14/B17/B18/B19/B20/B25/B28/B66/B70/

Transmitting Power 23 dBm 2 dB B85

(U)SIM Interface Support 1.8/3.0 V (U)SIM card Main UART Port:

Used for AT command communication and data transmission, the baud rate is 115200 bps by default. For more details, see Chapter 3.7.1. Used for firmware upgrade, and in such case, the baud rate is 921600 UART Interfaces bps by default. Debug UART Port:

Used for firmware debugging Default baud rate: 6 Mbps Network Protocols UDP/TCP/SNTP/LwM2M*/MQTT*/TLS*/DTLS*

SMS*

Text/PDU Mode Data Transmission Features AT Commands Firmware Update Single-tone (max): 25.5 kbps (DL)/16.7 kbps (UL) Multi-tone (max): 127 kbps (DL)/158.5 kbps (UL) 3GPP TS 27.005/3GPP TS 27.007 AT commands (3GPP Rel-13 and 3GPP Rel-14) and Quectel enhanced AT commands Upgrade firmware via main UART port Upgrade firmware via DFOTA Real Time Clock Supported Physical Characteristics Temperature Range Size: (17.7 0.15) mm (15.8 0.15) mm (2.0 0.2) mm Weight: 1.0 0.2 g Operating temperature range: -35 to +75 C 1) Extended temperature range: -40 to +85 C 2) Storage temperature range: -40 to +90 C BC660K-GL_Hardware_Design 2-11 / 59 NB-IoT Module Series BC660K-GL Hardware Design Antenna Interface 50 impedance control RoHS All hardware components are fully compliant with EU RoHS directive NOTES 1. 2. 3. 1) Within operating temperature range, the module is 3GPP compliant. 2) Within extended temperature range, the module remains the ability to establish and maintain functions such as SMS* and data transmission, without any unrecoverable malfunction. Radio spectrum and radio network will not be influenced, while one or more specifications, such as Pout, may exceed the specified tolerances of 3GPP. When the temperature returns to the normal operation temperature levels, the module will meet 3GPP specifications again.

"*" means under development. The following figure shows a block diagram of BC660K-GL and illustrates the major functional parts. 2.3. Functional Diagram Radio frequency Baseband Power management Peripheral interfaces BC660K-GL_Hardware_Design 2-12 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 1: Functional Diagram 2.4. Evaluation Board Quectel provides a complete set of development tools to facilitate the use and testing of BC660K-GL module. The development includes the TE-B board, a USB cable, an antenna and other peripherals. For more details, see document [1]. tool kit BC660K-GL_Hardware_Design 2-13 / 59 NB-IoT Module Series BC660K-GL Hardware Design 3 Application Interfaces BC660K-GL is equipped with a total of 58 pins, including 44 LCC pins and 14 LGA pins. The subsequent chapters will provide detailed descriptions of the following functions/pins/interfaces:

Power Supply PSM_EINT RESET_N BOOT UART Interfaces

(U)SIM Interface ADC Interface*

RI Interface*

NETLIGHT Interface*

NOTE

"*" means under development. BC660K-GL_Hardware_Design 3-14 / 59 3.1. Pin Assignment NB-IoT Module Series BC660K-GL Hardware Design Figure 2: Pin Assignment NOTE Keep all reserved and unused pins unconnected. BC660K-GL_Hardware_Design 3-15 / 59 NB-IoT Module Series BC660K-GL Hardware Design 3.2. Pin Description Table 3: I/O Parameters Definition Type AI AO DI DO IO PI PO Description Analog input Analog output Digital input Digital output Bidirectional Power input Power output Table 4: Pin Description Power Supply Pin Name Pin No. I/O Description DC Characteristics Comment VBAT 42, 43 PI Power supply for the module Vmax = 4.3 V Vmin = 2.2 V Vnorm = 3.3 V VDD_EXT 24 PO Vnorm = 1.8/3.3 V 1.8/3.3 V output for external circuit No voltage output in Deep Sleep/Light Sleep mode. It is intended to supply power for the modules pull-up circuits, and is not recommended to be used as the power supply for external circuits. GND 1, 27, 34, 36, 37, 40, 41, 56, 57, 58 Power Key Interface Pin Name Pin No. I/O Description DC Characteristics Comment BC660K-GL_Hardware_Design 3-16 / 59 NB-IoT Module Series BC660K-GL Hardware Design BOOT 7 DI Reset Interface Control module enter download mode VILmax = 0.2 VDD_EXT VIHmin = 0.7 VDD_EXT Active low. Pin Name Pin No. I/O Description DC Characteristics Comment RESET_N 15 DI Active low. Reset the module VILmax = 0.38 V VIHmin = 1.33 V VIHmax = 3.6 V PSM_EINT Interface Pin Name Pin No. I/O Description DC Characteristics Comment Dedicated external interrupt pin used to wake up the module from Deep Sleep/Light Sleep mode.. VILmax = 0.38 V VIHmin = 1.33 V VIHmax = 3.6 V Active on falling edge. PSM_EINT 19 DI Network Status Indication*

NETLIGHT 16 DO ADC Interface*

Pin Name Pin No. I/O Description DC Characteristics Comment Indicate the module's network activity status VOLmax = 0.15 VDD_EXT VOHmin = 0.8 VDD_EXT Pin Name Pin No. I/O Description DC Characteristics Comment ADC0 9 AI Main UART Port General-purpose analog to digital converter interface Voltage range:

01.2 V Pin Name Pin No. I/O Description DC Characteristics Comment MAIN_RXD 18 MAIN_TXD 17 DI DO Main UART receive Main UART transmit VILmax = 0.2 VDD_EXT VIHmin = 0.7 VDD_EXT VOLmax = 0.15 VDD_EXT VOHmin = 0.8 VDD_EXT VDD_EXT power domain. BC660K-GL_Hardware_Design 3-17 / 59 NB-IoT Module Series BC660K-GL Hardware Design Debug UART Port DBG_RXD 38 DBG_TXD 39 Ringing Signal*

(U)SIM Interface Pin Name Pin No. I/O Description DC Characteristics Comment DI DO Debug UART receive Debug UART transmit VILmax = 0.2 VDD_EXT VIHmin = 0.7 VDD_EXT VOLmax = 0.15 VDD_EXT VOHmin = 0.8 VDD_EXT VDD_EXT power domain. Pin Name Pin No. I/O Description DC Characteristics Comment RI 20 DO Ring indication VOLmax = 0.15 VDD_EXT VOHmin = 0.8 VDD_EXT VDD_EXT power domain. Pin Name Pin No. I/O Description DC Characteristics Comment

(U)SIM_VDD 14 Vnorm = 1.8/3.0 V VOLmax = 0.15 (U)SIM_VDD VOHmin = 0.8 (U)SIM_VDD VILmax = 0.2 (U)SIM_VDD VIHmin = 0.7 (U)SIM_VDD VOLmax = 0.15 (U)SIM_VDD VOHmin = 0.8 (U)SIM_VDD VOLmax = 0.15 (U)SIM_VDD VOHmin = 0.8 (U)SIM_VDD DO DO

(U)SIM card power supply

(U)SIM card reset

(U)SIM card data

(U)SIM card clock Specified ground for

(U)SIM card

(U)SIM_RST 12

(U)SIM_DAT A 11 IO

(U)SIM_CLK 13 DO

(U)SIM_GND 10 Antenna Interface ANT_RF 35 IO RF antenna interface Pin Name Pin No. I/O Description DC Characteristics Comment 50 characteristic impedance GPIO Interfaces GPIO1 GPIO2 3 4 Pin Name Pin No. I/O Description DC Characteristics Comment IO IO General-purpose input/output General-purpose input/output VILmax = 0.2 VDD_EXT VIHmin = 0.7 VDD_EXT VOLmax = 0.15 VDD_EXT VOHmin = 0.8 VDD_EXT VDD_EXT power domain. BC660K-GL_Hardware_Design 3-18 / 59 Pin Name Pin No. I/O Description DC Characteristics Comment NB-IoT Module Series BC660K-GL Hardware Design If unused, keep these pins open. 1.8 V power domain. If unused, keep these pins open. Control VDD_EXT voltage select 1.8 V or 3.3 V Keep these pins open. GRFC Interfaces GPIO3 GPIO4 GRFC1 GRFC2 5 6 54 55 Other Interface Pin IO IO General-purpose input/output General-purpose input/output DO DO Generic RF controller Generic RF controller VIO_SEL 52 DI Reserved Pins IO Voltage selection Floating: 1.8 V 0: 3.3 V Pin Name Pin No. I/O Description DC Characteristics Comment Pin Name Pin No. I/O Description DC Characteristics Comment RESERVED 2, 8, 2123, 25, 26, 2833, 4451, 53 NOTES 1. Keep all reserved and unused pins unconnected. 2. When VIO_SEL is grounded and VBAT 3.3 V, VDD_EXT = VBAT;

When VIO_SEL is grounded and VBAT 3.3 V, VDD_EXT = 3.3 V;

When VIO_SEL is floating, VDD_EXT = 1.8 V.

* means under development. 3. BC660K-GL_Hardware_Design 3-19 / 59 NB-IoT Module Series BC660K-GL Hardware Design 3.3. Operating Modes The following table describes the three working modes of the module briefly. Table 5: AP Operating Modes Mode Description Normal In normal mode, the AP handles tasks, such as AT command communication. Idle When all tasks are suspended, the AP will enter idle mode. Table 6: Modem Operating Modes Mode Description Connected DRX/eDRX PSM The network is connected and the module supports data transmission. In such a case, the modem can switch to DRX/eDRX mode. The modem is in idle mode, and downlink data can be received during PTW only. In such a case, the modem can switch to PSM or connected mode. In power saving mode, receive any downlink data. In such a case, the modem can switch to eDRX/DRX. the modem is disconnected from the network and cannot Table 7: Module Operating Modes Mode Description Active Light Sleep Deep Sleep When the AP is in normal mode or the modem is in connected mode, the module will be active and supports all services and functions. The current consumption in active mode is higher than that in sleep modes. Generally, when the AP is in idle mode and the modem is in DRX/eDRX mode, the module will enter Light Sleep mode. In such a case, the AP tasks will be suspended and the modem will be able to receive downlink data during PTW only. In Light Sleep mode, the current consumption of the module is reduced greatly. When the AP is in idle mode and the modem is idle or inactive, the module will enter deep sleep mode in which the CPU is powered off and only the 32 kHz RTC clock is working. In deep sleep mode, the current consumption will be reduced to the minimum (typical value: 800 nA). BC660K-GL_Hardware_Design 3-20 / 59 NB-IoT Module Series BC660K-GL Hardware Design Upon system requirement, there are several ways to drive the module to enter low current consumption status. In Light Sleep mode, the serial port does not work, and the module can be woken up through the falling edge of PSM_EINT. In this mode, the UART port is inactive and the module can be awakened through the main UART port. 3.4. Power Saving 3.4.1. Light Sleep 3.4.2. Deep Sleep The module consumes extremely low current in Deep Sleep mode (typical value: 800 nA). The main purpose of Deep Sleep is to reduce the power consumption of the module and prolong the power supply time of the battery. In Deep Sleep mode, the serial port does not work. The following figure shows the power consumption diagram of the module in different modes. Figure 3: Module Power Consumption in Different Modes (Modem) BC660K-GL_Hardware_Design 3-21 / 59 NB-IoT Module Series BC660K-GL Hardware Design When the modem remains in PSM and the AP is in idle mode, the module will enter deep sleep mode. The procedure of the modem entering PSM is as follows:

The modem requests to enable PSM in ATTACH REQUEST or TAU REQUEST message during ATTACH/TAU (Tracking Area Update) procedure. Then the network accepts the request and provides an active time value (T3324) to the modem and the mobile reachable timer starts. When the T3324 timer expires, the modem enters PSM for the duration of T3412 (periodic TAU timer). Please note that the module cannot request entering PSM when it is establishing an emergency attachment or initializing the PDN (Public Data Network) connection When the module is in deep sleep mode, it will be woken up in the following cases:

After the T3412 timer expires, the module will exit deep sleep automatically. Send an AT command to the module (this AT command will be lost), pull down the MAIN_RXD, and in falling edge, the module will be woken up from deep sleep. Pulling down PSM_EINT (falling edge) will wake up the module from deep sleep. The timing of waking up the module from PSM is illustrated below. Figure 4: Timing of Waking up Module from PSM 3.5. Power Supply 3.5.1. Power Supply Pins The module provides two VBAT pins for connection with an external power supply. The table below describes the module's VBAT and ground pins. BC660K-GL_Hardware_Design 3-22 / 59 NB-IoT Module Series BC660K-GL Hardware Design Table 8: Power Supply Pins Pin Name Pin No. Description Typ. Max. VBAT 42, 43 3.3 4.3 Power supply for the module Min. 2.2 Unit V GND GND 1, 27, 34, 36, 37, 40, 41, 56, 57, 58 3.5.2. Reference Design for Power Supply Power design for a module is critical to its performance. It is recommended to use a low quiescent current LDO with output current capacity of 0.5 A as the power supply for BC660K-GL. Lithium-thionyl chloride

(Li-SOCl2) batteries and Lithium manganese oxide (LiMn2O4) batteries can also be used as the power supply. The supply voltage of the module ranges from 2.2 V to 4.3 V. When the module is working, ensure its input voltage will never drop below 2.2 V; otherwise the module will be abnormal. For better power performance, it is recommended to place a 100 F tantalum capacitor with low ESR

(ESR = 0.7 ) and three ceramic capacitors (100 nF, 100 pF and 22 pF) near the VBAT pins. Also, it is recommended to add a TVS diode on the VBAT trace (near VBAT pins) to improve surge voltage withstand capability. In principle, the longer the VBAT trace is, the wider it should be. A reference circuit for power supply is illustrated in the following figure. Figure 5: Reference Circuit for Power Supply 3.5.3. Power Supply Voltage Detection*

You can use AT+CBC to monitor and query the current VBAT voltage. The unit of the voltage value is millivolt. For detailed information about the command, see document [2]. BC660K-GL_Hardware_Design 3-23 / 59 NB-IoT Module Series BC660K-GL Hardware Design NOTE

* means under development. 3.6. Power-up/Power-down Scenarios 3.6.1. Power-up After the module VBAT is powered on, keep the RESET_N and BOOT inputs not being pulled down, and the module can turn on automatically. The power-up timing is illustrated in the following figure. Figure 6: Power-up Timing NOTES 1. After the VBAT is powered down, its voltage must be lower than 0.7 V. The specific discharge time needs to be evaluated based on the actual circuit test, and enough margin is left to avoid abnormal startup when the it is powered on again. 2. The power-up time of VBAT must be within 10 ms. 3. It is recommended that the MCU retain the RESET_N control pin. When the abnormal power-on sequence causes the module to start abnormally, the RESET_N control pin can control the module to reset to exit the abnormal state. 4. After VBAT is powered on, RESET_N and BOOT automatically rise to high level due to internal pull-ups. BC660K-GL_Hardware_Design 3-24 / 59 NB-IoT Module Series BC660K-GL Hardware Design 3.6.2. Power-down The module can be shut down through disconnecting VBAT power supply. Figure 7: Power-down Timing 3.6.3. Reset Driving RESET_N low for at least 50 ms will reset the module. Table 9: Reset Pin Definition Pin Name Pin No. Description Reset Pull-down Time RESET_N 15 Reset the module. Active low. 50 ms The recommended circuits of resetting the module are shown below. An open drain/collector driver or button can be used to control the RESET_N pin. Figure 8: Reference Circuit of RESET_N by Using Driving Circuit BC660K-GL_Hardware_Design 3-25 / 59 NB-IoT Module Series BC660K-GL Hardware Design NOTES 1. When the high level output of RESET_CONTROL is more than 1.7 V and less than 3.6 V, and the low level output is less than 0.35 V, it is recommended to use the direct connection method to control the RESET_N pin of the module. In other cases, it must be controlled by an open collector drive circuit. It is recommended to reserve a 100 nF capacitor position, which is not mounted by default. 2. Figure 9: Reference Circuit of RESET_N by Using Button 3.6.4. Download In the process of system reset or power-on, keep the BOOT pin input low and the module will enter the download mode. In download mode, the firmware can be downloaded through the main serial port. After the download is complete, the module needs to be reset to exit the download mode. An open drain/collector driver or button can be used to control the BOOT pin. BC660K-GL_Hardware_Design 3-26 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 10: Reference Circuit of BOOT by Using Button NOTE If the BOOT pin is connected to a filter capacitor in parallel, the capacitance of the capacitor cannot be higher than 33 pF. 3.7. UART Interfaces The module provides two UART ports: main UART port and debug UART port. The module is designed as DCE (Data Communication Equipment), following the traditional DCE-DTE (Data Terminal Equipment) connection. Table 10: Pin Definition of UART Interfaces Interface Pin Name Pin No. Description Main UART Port Debug UART Port MAIN_TXD 17 Main UART transmit MAIN_RXD 18 Main UART receive DBG_RXD DBG_TXD 38 39 20 Debug UART receive Debug UART transmit Ring Indication RI*

Ring indication (when there is a SMS or a URC output, the module will inform DTE with the RI pin) BC660K-GL_Hardware_Design 3-27 / 59 NB-IoT Module Series BC660K-GL Hardware Design 3.7.1. Main UART Port The main UART port supports AT command communication, data transmission and firmware upgrade. Default baud rate: 115200 bps Fixed baud rates: 2400 bps, 4800 bps, 9600 bps, 19200 bps, 38400 bps, 57600 bps, 115200 bps, 230400 bps, 460800 bps When the port is used for firmware upgrade, the baud rate is 921600 bps by default. When the module enters Deep Sleep/Light Sleep mode, it can wake up the module by sending AT commands through the main serial port. is generally recommended to send the command AT continuously until OK is returned before sending AT commands to other services. It The figure below shows the connection between DCE and DTE. Figure 11: Reference Design for Main UART Port 3.7.2. Debug UART Port Through debug tools, the debug UART port can be used to output logs for firmware debugging. Its baud rate is 6 Mbps by default. The following is a reference design of debug UART port. Figure 12: Reference Design of Debug UART Port BC660K-GL_Hardware_Design 3-28 / 59 NB-IoT Module Series BC660K-GL Hardware Design 3.7.3. UART Application The serial port voltage domain of this module is optional. Customers can select the appropriate voltage domain through VIO_SEL according to the actual situation. When VIO_SEL is floating, the VDD_EXT voltage domain is 1.8 V; when VIO_SEL is grounded, the VDD_EXT voltage domain is 3.3 V. If the voltage domain of the customer application system is 1.8 V, VIO_SEL can be floating; If the voltage domain of the customer application system is 3.3 V, VIO_SEL can be grounded. The following figure shows the reference circuit design:

Figure 13: Reference Circuit Design of UART The following circuit shows a reference design for the communication between the module and a PC with standard RS-232 interface. Make sure to select appropriate voltage domain through VIO_SEL according to the actual situation. BC660K-GL_Hardware_Design 3-29 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 14: Sketch Map for RS-232 Interface Match Please visit vendors websites to select a suitable RS-232 transceiver, such as: http://www.exar.com and http://www.maximintegrated.com. NOTES 1. 2. If the voltage domain of your application system is 1.8 V, keep the R1 marked in red not mounted; If the voltage domain of your application system is 3.3 V, keep the R1 marked in red mounted. represents the test points of UART interfaces. It is also recommended to reserve the test points of VBAT, BOOT and RESET_N, for convenient firmware upgrade and debugging when necessary. 3. VDD_EXT cannot pull up the module MAIN_RXD directly. If VDD_EXT need pull up the module MAIN_RXD, you need to connect a Schottky diode in series first, and then pull up the module MAIN_RXD through a 4.7-20 k resistor. For more details, see document [3]. 4. When VIO_SEL is grounded and VBAT 3.3 V, VDD_EXT = VBAT;

When VIO_SEL is grounded and VBAT 3.3 V, VDD_EXT = 3.3 V;

When VIO_SEL is floating, VDD_EXT = 1.8 V. When the serial port voltage is neither 1.8 V nor 3.3 V, it is recommended to use a transistor level conversion circuit. The circuit design of dotted line section can refer to the design of solid line section, in terms of both module input and output circuit designs, but please pay attention to the direction of connection. BC660K-GL_Hardware_Design 3-30 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 15: Reference Circuit with Transistor Circuit NOTES 1. VDD_EXT cannot pull up MAIN_RXD directly. Due to the anti-backflow design of the MAIN_RXD pin, MAIN_RXD pin can be directly connected to the TXD of DTE in the 1.83.3 V voltage domain. If the Deep Sleep/Light Sleep mode wake-up function of the MAIN_RXD is enabled, it is recommended that MAIN_RXD does not use a level conversion circuit to avoid abnormal wake-up. If you choose the transistor conversion circuit, dont mount the R1 marked in red. If VDD_EXT need pull up the module MAIN_RXD, you need to connect a Schottky diode in series first, and then pull up the module MAIN_RXD through a 4.7-20 k resistor. For more details, see document [3]. 2. 3. 4. Transistor circuit solution is not suitable for applications with high baud rates exceeding 460 kbps. 3.8. (U)SIM Interface The (U)SIM card is powered by an internal regulator in the module. Both 1.8 V and 3.0 V (U)SIM cards are supported. Table 11: Pin Definition of (U)SIM Interface Pin Name Description Comment Pin No.

(U)SIM_VDD 14

(U)SIM card power supply When 3.0 V VBAT 4.3 V, support 1.8/3.0 V (U)SIM card;

When 2.2 V VBAT < 3 V, only support 1.8 V (U)SIM card;

Maximum supply current: about 80 mA. BC660K-GL_Hardware_Design 3-31 / 59 NB-IoT Module Series BC660K-GL Hardware Design

(U)SIM_CLK 13

(U)SIM card clock

(U)SIM_DATA 11

(U)SIM card data

(U)SIM_RST

(U)SIM card reset 12 10

(U)SIM_GND Specified ground for (U)SIM card A reference circuit design for (U)SIM interface with a 6-pin (U)SIM card connector is illustrated below. Figure 16: Reference Circuit for (U)SIM Interface with a 6-pin (U)SIM Card Connector To enhance the reliability and availability of the (U)SIM card in applications, follow the criteria below in

(U)SIM circuit design:

Keep the placement of (U)SIM card connector as close to the module as possible. Keep the trace length as less than 200 mm as possible. Keep (U)SIM card signals away from RF and VBAT traces. Assure the trace between the ground of the module and that of (U)SIM card connector is short and wide. Keep the trace width of the ground no less than 0.5 mm to maintain the same electric potential. The decoupling capacitor between (U)SIM_VDD and GND should be not more than 1 F and be placed close to the (U)SIM card connector. To avoid cross-talk between (U)SIM_DATA and (U)SIM_CLK, keep them away from each other and shield them separately with the surrounded ground. In order to offer good ESD protection, it is recommended to add a TVS diode array whose parasitic capacitance should be not more than 50 pF. The ESD protection device should be placed as close to

(U)SIM card connector as possible, and ensure the (U)SIM card signal lines go through the ESD protection device first from (U)SIM card connector and then to the module. The 22 resistors should be connected in series between the module and the (U)SIM card connector to suppress EMI spurious transmission and enhance ESD protection. Please note that the (U)SIM peripheral circuit should be BC660K-GL_Hardware_Design 3-32 / 59 NB-IoT Module Series BC660K-GL Hardware Design The pull-up resistor on the SIM_DATA line can improve anti-jamming capability and should be placed close to the (U)SIM card connector. close to the (U)SIM card connector. is necessary (U)SIM_DATA must add a 10 k pull-up resistor to (U)SIM_VDD to improve NOTE It anti-interference ability. 3.9. ADC Interface*

The module provides a 12-bit ADC input channel to read the voltage value. Table 12: Pin Definition of ADC Interface Pin Name Pin No. Description Sample Range ADC0 9 Analog to digital converter interface 01.2 V NOTES 1. 2. 320 k pull-down resistor is integrated inside the ADC pin. This resistor needs to be considered when calculating the resistor divider relationship.

* means under development. When there is a message received or a URC output, the module will notify DTE through the RI interface. 3.10. RI Interface*

Table 13: RI Signal Status Module Status RI Signal Level Standby High pulse URC When a URC is received, RI outputs 120 ms low pulse and starts data output. BC660K-GL_Hardware_Design 3-33 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 17: RI Behaviour When a URC is Received NOTE

* means under development. 3.11. NETLIGHT Interface*

NETLIGHT can be used to indicate the network status of the module. The following table illustrates the module status indicated by NETLIGHT. A reference circuit is shown as below. BC660K-GL_Hardware_Design 3-34 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 18: Reference Design of NETLIGHT NOTE

* means under development. BC660K-GL_Hardware_Design 3-35 / 59 NB-IoT Module Series BC660K-GL Hardware Design 4 Antenna Interface The pin 35 is the RF antenna pad. The antenna port has an impedance of 50 . 4.1. Pin Definition Table 14: Pin Definition of NB-IoT Antenna Interface Pin Name ANT_RF GND Pin No. 35 34, 36, 37 Description RF antenna interface Ground 4.2. Operating Frequencies Table 15: Module Operating Frequencies Frequency Band Receiving Frequency Transmitting Frequency B1 B2 B3 B4 B5 B8 B12 B13 21102170 MHz 19201980 MHz 19301990 MHz 18501910 MHz 18051880 MHz 17101785 MHz 21102155 MHz 17101755 MHz 869894 MHz 824849 MHz 925960 MHz 880915 MHz 729746 MHz 699716 MHz 746756 MHz 777787 MHz BC660K-GL_Hardware_Design 4-36 / 59 NB-IoT Module Series BC660K-GL Hardware Design 758768 MHz 788798 MHz 734746 MHz 704716 MHz 860875 MHz 815830 MHz 875890 MHz 830845 MHz 791821 MHz 832862 MHz 19301995 MHz 18501915 MHz 758803 MHz 703748 MHz 21102180 MHz 17101780 MHz 19952020 MHz 16951710 MHz 728746 MHz 698716 MHz B14 B17 B18 B19 B20 B25 B28 B66 B70 B85 4.3. RF Antenna Reference Design BC660K-GL provides an RF antenna pin for external NB-IoT antenna connection. The RF trace on host PCB connected to the modules RF antenna pad should be coplanar waveguide or microstrip, whose characteristic impedance should be close to 50 . The module comes with ground pads which are next to the antenna pad to give a better grounding. In order to achieve better RF performance, it is recommended to reserve a type matching circuit and place the -type matching components (R1/C1/C2) as close to the antenna as possible. By default, the capacitors (C1/C2) are not mounted and a 0 resistor is mounted on R1. A reference design of the RF interface is shown as below. BC660K-GL_Hardware_Design 4-37 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 19: Reference Design of NB-IoT Antenna Interface 4.4. Reference Design of RF Layout For users PCB, the characteristic impedance of all RF traces should be controlled to 50 . The impedance of the RF traces is usually determined by the trace width (W), the materials dielectric constant, height from the reference ground to the signal layer (H), and the clearance between RF traces and grounds (S). Microstrip or coplanar waveguide is typically used in RF layout to control characteristic impedance. The following are reference designs of microstrip or coplanar waveguide with different PCB structures. Figure 20: Microstrip Design on a 2-layer PCB BC660K-GL_Hardware_Design 4-38 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 21: Coplanar Waveguide Design on a 2-layer PCB Figure 22: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground) Figure 23: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground) To ensure RF performance and reliability, the following principles should be complied with in RF layout design:

BC660K-GL_Hardware_Design 4-39 / 59 NB-IoT Module Series BC660K-GL Hardware Design Use an impedance simulation tool to accurately control the characteristic impedance of RF traces to The GND pins adjacent to RF pins should not be designed as thermal relief pads, and should be fully 50 . connected to ground. The distance between the RF pins and the RF connector should be as short as possible, and all the right-angle traces should be changed to curved ones. There should be clearance under the signal pin of the antenna connector or solder joint. The reference ground of RF traces should be complete. Meanwhile, adding some ground vias around RF traces and the reference ground could help to improve RF performance. The distance between the ground vias and RF traces should be no less than two times as wide as RF signal traces (2 W). For more details, see document [4]. 4.5. Antenna Requirements To minimize the loss on RF trace and RF cable, pay attention to the antenna design. The following tables show the requirements on NB-IoT antenna. Table 16: Antenna Cable Insertion Loss Requirements Band Requirements LTE B5/B8/B12/B13/B14/B17/B18/B19/B20/B28/B85 Cable insertion loss: < 1 dB LTE B1/B2/B3/B4/B25/B66/B70 Cable insertion loss: < 1.5 dB Table 17: Required Antenna Parameters Parameters Requirements Frequency Range 6982200 MHz VSWR Efficiency Max Input Power (W) Input Impedance ()

> 30 %

2 50 50 BC660K-GL_Hardware_Design 4-40 / 59 NB-IoT Module Series BC660K-GL Hardware Design 4.6. RF Output Power Table 18: RF Conducted Output Power Frequency Band Max. 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB 23 dBm 2 dB Min.

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm

< -39 dBm B1 B2 B3 B4 B5 B8 B12 B13 B14 B17 B18 B19 B20 B25 B28 B66 B70 B85 NOTE The design conforms to the NB-IoT radio protocols in 3GPP Rel.13. BC660K-GL_Hardware_Design 4-41 / 59 NB-IoT Module Series BC660K-GL Hardware Design 4.7. RF Receiving Sensitivity Table 19: Receiving Sensitivity (with RF Retransmissions) Frequency Band Receiving Sensitivity B1 B2 B3 B4 B5 B8 B12 B13 B14 B17 B18 B19 B20 B25 B28 B66 B70 B85

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm

-129 dBm BC660K-GL_Hardware_Design 4-42 / 59 NB-IoT Module Series BC660K-GL Hardware Design 4.8. Recommended RF Connector for Antenna Installation If RF connector is used for antenna connection, it is recommended to use the U.FL-R-SMT connector provided by HIROSE. Figure 24: Dimensions of the U.FL-R-SMT Connector (Unit: mm) U.FL-LP serial connectors listed in the following figure can be used to match the U.FL-R-SMT. Figure 25: Mechanicals of U.FL-LP Connectors BC660K-GL_Hardware_Design 4-43 / 59 The following figure describes the space factor of mated connector. NB-IoT Module Series BC660K-GL Hardware Design Figure 26: Space Factor of Mated Connector (Unit: mm) For more details, please visit http://www.hirose.com. BC660K-GL_Hardware_Design 4-44 / 59 NB-IoT Module Series BC660K-GL Hardware Design 5 Reliability and Electrical Characteristics 5.1. Operating and Storage Temperatures The following table lists the operating and storage temperatures of the module. Table 20: Operation and Storage Temperatures Parameter Operating Temperature Range 1) Extended Temperature Range 2) Storage Temperature Range Min.

-35

-40

-40 Typ.

+25 Max.

+75

+85

+90 Unit C C C NOTES 1. 2. 3. 1) Within operating temperature range, the module is 3GPP compliant. 2) Within extended temperature range, the module remains the ability to establish and maintain functions such as SMS* and data transmission, without any unrecoverable malfunction. Radio spectrum and radio network will not be influenced, while one or more specifications, such as Pout, may exceed the specified tolerances of 3GPP. When the temperature returns to the normal operation temperature levels, the module will meet 3GPP specifications again.

* means under development. BC660K-GL_Hardware_Design 5-45 / 59 NB-IoT Module Series BC660K-GL Hardware Design 5.2. Current Consumption The table below lists the current consumption of BC660K-GL under different states. Table 21: Module Current Consumption (3.3 V VBAT Power Supply) AP Mode Modem Mode Min. Typ. Max. Unit AP Mode Modem Mode Min. Typ. Max. Unit eDRX = 40.96 s, PTW = 10.24 s, ECL = 0 Deep Sleep Idle PSM Light Sleep Idle

@ DRX = 1.28 s

@ DRX = 2.56 s Active 1) Normal Single-tone

(15 kHz subcarrier spacing)

0.8 38 220 110 111 108 100 100 98 105 120 100 100 115 94

300 305 280 277 270 299 332 283 282 325 265 A A A A mA mA mA mA mA mA mA mA mA mA mA B1 @ 23dBm B2 @ 23 dBm B3 @ 23 dBm B4 @ 23 dBm B5 @ 23 dBm B8 @ 23 dBm B12 @ 23 dBm B13 @ 23 dBm B14 @ 23 dBm B17 @ 23 dBm B18 @ 23 dBm AP Mode Modem Mode Min. Typ. Max. 2) Unit BC660K-GL_Hardware_Design 5-46 / 59 NB-IoT Module Series BC660K-GL Hardware Design 95 98 108 109 101 104 115 240 230 213 212 202 221 259 218 217 252 199 201 207 232 240 213 216 252 270 272 301 310 280 276 329 311 296 274 273 263 298 328 279 278 325 258 260 267 297 306 274 273 323 mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA B19 @ 23 dBm B20 @ 23 dBm B25 @ 23 dBm B28 @ 23 dBm B66 @ 23 dBm B70 @ 23 dBm B85 @ 23 dBm B1 @ 23 dBm B2 @ 23 dBm B3 @ 23 dBm B4 @ 23 dBm B5 @ 23 dBm B8 @ 23 dBm B12 @ 23 dBm B13 @ 23 dBm B14 @ 23 dBm B17 @ 23 dBm B18 @ 23 dBm B19 @ 23 dBm B20 @ 23 dBm B25 @ 23 dBm B28 @ 23 dBm B66 @ 23 dBm B70 @ 23 dBm B85 @ 23 dBm

Single-tone

(3.75 kHz subcarrier spacing) BC660K-GL_Hardware_Design 5-47 / 59 NB-IoT Module Series BC660K-GL Hardware Design NOTES 1. 2. 1) Power consumption under instrument test condition. 2) The maximum value in Active mode refers to the maximum pulse current during RF emission. 5.3. Electrostatic Discharge The module is not protected against electrostatics discharge (ESD) in general. Consequently, it is subject to ESD handling precautions that typically apply to ESD sensitive components. Proper ESD handling and packaging procedures must be applied throughout the processing, handling and operation of any application that incorporates the module. The following table shows the modules electrostatic discharge characteristics. Table 22: Electrostatic Discharge Characteristics (25 C, 45 % Relative Humidity) Tested Interfaces Contact Discharge Air Discharge Unit VBAT, GND Antenna interface 5 5 Other interfaces 0.5 10 10 1 kV kV kV BC660K-GL_Hardware_Design 5-48 / 59 NB-IoT Module Series BC660K-GL Hardware Design 6 Mechanical Features This chapter describes the mechanical dimensions of millimeter (mm), and the dimensional tolerances are 0.05 mm unless otherwise specified. the module. All dimensions are measured in 6.1. Mechanical Dimensions 15.8 0.15 14.15 0.15 2.0 0.2 Pin 1 7 0

. 5 1 0

. 7 7 1

. 5 1 0

. 5 0 6 1 Figure 27: BC660K-GL Top and Side Dimensions (Unit: mm) 0.6 0.1 BC660K-GL_Hardware_Design 6-49 / 59 NB-IoT Module Series BC660K-GL Hardware Design 15.8 0.15 4.4 4.3 7 0

. 5 2 2

. Pin 1 8 1

. 1.0 9 1

. 1.1 4.4 3.5 5 3 4

. 7 3

. 5 1 0 7 7 1

. 7 0

. 1.5 Figure 28: Module Bottom Dimension (Bottom View) NOTE The package warpage level of the module conforms to JEITA ED-7306 standard. BC660K-GL_Hardware_Design 6-50 / 59 6.2. Recommended Footprint NB-IoT Module Series BC660K-GL Hardware Design 18.100.15 15.800.15 0.35 36 4.35 1.80 1.00 0.35 1.80 17.700.15 20.000.15 1 Pin 1 1.10 6.10 1.00 1.00 6.15 23 0.35 14 2.50 4.30 Figure 29: Recommended Footprint (Unit: mm) 0.70 NOTE For easy maintenance of the module, it is recommended to keep about 3 mm between the module and other components on the motherboard. BC660K-GL_Hardware_Design 6-51 / 59 6.3. Top and Bottom Views NB-IoT Module Series BC660K-GL Hardware Design Figure 30: Top View of the Module Figure 31: Bottom View of the Module NOTE Images above are for illustration purpose only and may differ from the actual module. For authentic appearance and label, please refer to the module received from Quectel. BC660K-GL_Hardware_Design 6-52 / 59 NB-IoT Module Series BC660K-GL Hardware Design 7 Storage, Manufacturing and Packaging 7.1. Storage The module is provided with vacuum-sealed packaging. MSL of the module is rated as 3. The storage requirements are shown below. 1. Recommended Storage Condition: The temperature should be 23 5 C and the relative humidity should be 3560 %. 2. The storage life (in vacuum-sealed packaging) is 12 months in Recommended Storage Condition. 3. The floor life of the module is 168 hours 1) in a plant where the temperature is 23 5 C and relative humidity is below 60 %. After the vacuum-sealed packaging is removed, the module must be processed in reflow soldering or other high-temperature operations within 168 hours. Otherwise, the module should be stored in an environment where the relative humidity is less than 10 % (e.g. a drying cabinet). 4. The module should be pre-baked to avoid blistering, cracks and inner-layer separation in PCB under the following circumstances:

The module is not stored in Recommended Storage Condition;

Violation of the third requirement above occurs;

Vacuum-sealed packaging is broken, or the packaging has been removed for over 24 hours;

Before module repairing. 5. If needed, the pre-baking should follow the requirements below:

The module should be baked for 8 hours at 120 5 C;

All modules must be soldered to PCB within 24 hours after the baking, otherwise they should be put in a dry environment such as in a drying oven. BC660K-GL_Hardware_Design 7-53 / 59 NB-IoT Module Series BC660K-GL Hardware Design NOTES 1) This floor life is only applicable when the environment conforms to IPC/JEDEC J-STD-033. 1. 2. To avoid blistering, layer separation and other soldering issues, it is forbidden to expose the modules to the air for a long time. If the temperature and moisture do not conform to IPC/JEDEC J-STD-033 or the relative moisture is over 60%, It is recommended to start the solder reflow process within 24 hours after the package is removed. And do not remove the packages of tremendous modules if they are not ready for soldering. 3. Please take the module out of the packaging and put it on high-temperature resistant fixtures before If shorter baking time is desired, please refer to IPC/JEDEC J-STD-033 for baking the baking. procedure. 7.2. Manufacturing and Soldering Push the squeegee to apply the solder paste on the surface of stencil, thus making the paste fill the stencil openings and then penetrate to the PCB. The force on the squeegee should be adjusted properly so as to produce a clean stencil surface on a single pass. To ensure the module soldering quality, the thickness of stencil for the module is recommended to be 0.150.18 mm. For more details, see document [5]. It is suggested that the peak reflow temperature is 238245 C, and the absolute maximum reflow temperature is 245 C. To avoid damage to the module caused by repeated heating, it is strongly recommended that the module should be mounted after reflow soldering for the other side of PCB has been completed. The recommended reflow soldering thermal profile (lead-free reflow soldering) and related parameters are shown below. Figure 32: Recommended Reflow Soldering Thermal Profile BC660K-GL_Hardware_Design 7-54 / 59 Table 23: Recommended Thermal Profile Parameters NB-IoT Module Series BC660K-GL Hardware Design Soak time (between A and B: 150C and 200C) 70120 s Factor Soak Zone Max slope Reflow Zone Max slope Reflow time (D: over 220C) Max temperature Cooling down slope Reflow Cycle Max reflow cycle NOTES Recommendation 13 C/s 23 C/s 4570 s 238 to 246 C

-1.5 to -3 C/s 1 1. During manufacturing and soldering, or any other processes that may contact the module directly, NEVER wipe the modules shielding can with organic solvents, such as acetone, ethyl alcohol, isopropyl alcohol, trichloroethylene, etc. Otherwise, the shielding can may become rusted. 2. The shielding can for the module is made of Cupro-Nickel base material. It is tested that after 12 hours Neutral Salt Spray test, the laser engraved label information on the shielding can is still clearly identifiable and the QR code is still readable, although white rust may be found. If a conformal coating is necessary for the module, do NOT use any coating material that may chemically react with the PCB or shielding cover, and prevent the coating material from flowing into the module. 3. 7.3. Tape and Reel Packaging The modules are stored in a vacuum-sealed bag which is ESD-proof. The bag should not be opened until the devices are ready to be soldered onto the application. The reel is 330 mm in diameter and each reel contains 250 modules. BC660K-GL_Hardware_Design 7-55 / 59 NB-IoT Module Series BC660K-GL Hardware Design Figure 33: Tape Dimensions (Unit: mm) Figure 34: Reel Dimensions (Unit: mm) BC660K-GL_Hardware_Design 7-56 / 59 NB-IoT Module Series BC660K-GL Hardware Design 8 Appendix A References Table 24: Related Documents SN Document Name Description

[1]

Quectel_BC660K-GL-TE-B_User_Guide BC660K-GL-TE-B User Guide

[2]

Quectel_BC660K-GL_AT_Commands_Manual BC660K-GL AT Commands Manual

[3]

Quectel_BC660K-GL_Reference_Design BC660K-GL Reference Design

[4]

Quectel_RF_Layout_Application_Note RF Layout Application Note

[5]

Quectel_Module_Secondary_SMT_User_Guide Module Secondary SMT User Guide Table 25: Terms and Abbreviations Abbreviation Description ADC DCE DRX DTE DTLS eDRX EMI ESD Analog-to-Digital Converter Data Communications Equipment (typically module) Discontinuous Reception Data Terminal Equipment (typically computer, external controller) Datagram Transport Layer Security extended Discontinuous Reception Electromagnetic Interference Electrostatic Discharge H-FDD Half Frequency Division Duplexing HTTP Hyper Text Transfer Protocol HTTPS Hyper Text Transfer Protocol over Secure Socket Layer BC660K-GL_Hardware_Design 57 / 59 NB-IoT Module Series BC660K-GL Hardware Design LwM2M Lightweight M2M MQTT Message Queuing Telemetry Transport NB-IoT Narrow Band- Internet of Things I/O kbps LED LTE PCB PDU PSM PTW RF RTC RXD SMS TCP TE TLS TXD UDP URC Input/Output Kilo Bits Per Second Light Emitting Diode Long Term Evolution Printed Circuit Board Protocol Data Unit Power Save Mode Paging Time Window Radio Frequency Real Time Clock Receive Data Short Message Service Transmission Control Protocol Terminal Equipment Transport Layer Security Transmitting Data User Datagram Protocol Unsolicited Result Code UART Universal Asynchronous Receiver & Transmitter

(U)SIM Universal Subscriber Identification Module VSWR Voltage Standing Wave Ratio Vmax Maximum Voltage Value BC660K-GL_Hardware_Design 58 / 59 NB-IoT Module Series BC660K-GL Hardware Design Vnorm Normal Voltage Value Vmin Minimum Voltage Value VIHmax Maximum Input High Level Voltage Value VIHmin VILmax VILmin VImax Minimum Input High Level Voltage Value Maximum Input Low Level Voltage Value Minimum Input Low Level Voltage Value Absolute Maximum Input Voltage Value VInorm Absolute Normal Input Voltage Value VImin Absolute Minimum Input Voltage Value VOHmax Maximum Output High Level Voltage Value VOHmin Minimum Output High Level Voltage Value VOLmax Maximum Output Low Level Voltage Value VOLmin Minimum Output Low Level Voltage Value Installation engineers need to be aware of the potential risk of the thermal effects of radio frequency energy and how to stay protected against undue risk. The EUT is a mobile device; maintain at least a 20 cm separation between the EUT and the user's body and must not transmit simultaneously with any other antenna or transmitter. BC660K-GL_Hardware_Design 59 / 59 OEM/Integrators Installation Manual Important Notice to OEM integrators 1. This module is limited to OEM installation ONLY. 2. This module is limited to installation in mobile or fixed applications, according to Part 2.1091(b). 3. The separate approval is required for all other operating configurations, including portable configurations with respect to Part 2.1093 and different antenna configurations 4. For FCC Part 15.31 (h) and (k): The host manufacturer is responsible for additional testing to verify compliance as a composite system. When testing the host device for compliance with Part 15 Subpart B, the host manufacturer is required to show compliance with Part 15 Subpart B while the transmitter module(s) are installed and operating. The modules should be transmitting and the evaluation should confirm that the module's intentional emissions are compliant (i.e. fundamental and out of band emissions). The host manufacturer must verify that there are no additional unintentional emissions other than what is permitted in Part 15 Subpart B or emissions are complaint with the transmitter(s) rule(s). The Grantee will provide guidance to the host manufacturer for Part 15 B requirements if needed. Important Note notice that any deviation(s) from the defined parameters of the antenna trace, as described by the instructions, require that the host product manufacturer must notify to Quectel that they wish to change the antenna trace design. In this case, a Class II permissive change application is required to be filed by the USI, or the host manufacturer can take responsibility through the change in FCC ID (new application) procedure followed by a Class II permissive change application End Product Labeling When the module is installed in the host device, the FCC/IC ID label must be visible through a window on the final device or it must be visible when an access panel, door or cover is easily re-moved. If not, a second label must be placed on the outside of the final device that contains the following text: Contains FCC ID: XMR2021BC660KGL Contains IC: 10224A-2021BC660GL . The FCC ID/IC ID can be used only when all FCC/IC compliance requirements are met. Antenna authorization.

(1) The antenna must be installed such that 20 cm is maintained between the antenna and users,

(2) The transmitter module may not be co-located with any other transmitter or antenna. In the event that these conditions cannot be met (for example certain laptop configurations or co-location with another transmitter), then the FCC/IC authorization is no longer considered valid and the FCC ID/IC ID cannot be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate FCC/IC To comply with FCC regulations limiting both maximum RF output power and human exposure to RF radiation, maximum antenna gain (including cable loss) must not exceed Test Mode Antenna Gain (dBi) Test Mode Antenna Gain (dBi) NB-IoT Band 2 NB-IoT Band 4*

NB-IoT Band 5 NB-IoT Band 12 NB-IoT Band 13 8.00 8.00 5.00 5.00 5.00 NB-IoT Band 14 NB-IoT Band 17 NB-IoT Band 25 NB-IoT Band 66*

NB-IoT Band 85 5.00 5.00 8.00 8.00 5.00 Note: * means when using these max gain antenna, the host manufacturer should reduce the conducted power to meet the FCC maximum RF output power limit. Manual Information to the End User The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the users manual of the end product which integrates this module. The end user manual shall include all required regulatory information/warning as show in this manual Federal Communication Commission Interference Statement This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

(1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:

- Reorient or relocate the receiving antenna.

- Increase the separation between the equipment and receiver

- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

- Consult the dealer or an experienced radio/TV technician for help. Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. List of applicable FCC rules This module has been tested and found to comply with part 22, part 24, part 27, part 90 requirements for Modular Approval. The modular transmitter is only FCC authorized for the specific rule parts (i.e., FCC transmitter rules) listed on the grant, and that the host product manufacturer is responsible for compliance to any other FCC rules that apply to the host not covered by the modular transmitter grant of certification. If the grantee markets their product as being Part 15 Subpart B compliant (when it also contains unintentional-

radiator digital circuity), then the grantee shall provide a notice stating that the final host product still requires Part 15 Subpart B compliance testing with the modular transmitter installed. This device is intended only for OEM integrators under the following conditions: (For module device use) 1) The antenna must be installed such that 20 cm is maintained between the antenna and users, and 2) The transmitter module may not be co-located with any other transmitter or antenna. As long as 2 conditions above are met, further transmitter test will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed. Radiation Exposure Statement your body. This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20 cm between the radiator &

Industry Canada Statement This device complies with Industry Canadas licence-exempt RSSs. Operation is subject to the following

(1) This device may not cause interference; and

(2) This device must accept any interference, including interference that may cause undesired operation two conditions:

of the device. Le prsent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorise aux deux conditions suivantes:

(1) l'appareil ne doit pas produire de brouillage, et

(2) l'utilisateur de l'appareil doit accepter tout brouillage radiolectrique subi, mme si le brouillage est susceptible d'en compromettre le fonctionnement."

Radiation Exposure Statement body Dclaration d'exposition aux radiations:

This equipment complies with IC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20 cm between the radiator & your Cet quipement est conforme aux limites d'exposition aux rayonnements ISED tablies pour un environnement non contrl. Cet quipement doit tre install et utilis avec un minimum de 20 cm de distance entre la source de rayonnement et votre corps. This device is intended only for OEM integrators under the following conditions: (For module device use) 1) The antenna must be installed such that 20 cm is maintained between the antenna and users, and 2) The transmitter module may not be co-located with any other transmitter or antenna. As long as 2 conditions above are met, further transmitter test will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed. Cet appareil est conu uniquement pour les intgrateurs OEM dans les conditions suivantes: (Pour utilisation de dispositif module) 1) L'antenne doit tre installe de telle sorte qu'une distance de 20 cm est respecte entre l'antenne et les utilisateurs, et 2) Le module metteur peut ne pas tre complant avec un autre metteur ou antenne. Tant que les 2 conditions ci-dessus sont remplies, des essais supplmentaires sur l'metteur ne seront pas ncessaires. Toutefois, l'intgrateur OEM est toujours responsable des essais sur son produit final pour toutes exigences de conformit supplmentaires requis pour ce module install. IMPORTANT NOTE:

In the event that these conditions cannot be met (for example certain laptop configurations or colocation with another transmitter), then the Canada authorization is no longer considered valid and the IC ID cannot be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate Canada authorization. NOTE IMPORTANTE:

Dans le cas o ces conditions ne peuvent tre satisfaites (par exemple pour certaines configurations d'ordinateur portable ou de certaines co-localisation avec un autre metteur), l'autorisation du Canada n'est plus considr comme valide et l'ID IC ne peut pas tre utilis sur le produit final. Dans ces circonstances, l'intgrateur OEM sera charg de rvaluer le produit final (y compris l'metteur) et l'obtention d'une autorisation distincte au Canada. End Product Labeling This transmitter module is authorized only for use in device where the antenna may be installed such that 20 cm may be maintained between the antenna and users. The final end product must be labeled in a visible area with the following: Contains IC: 10224A-2021BC660GL. Plaque signaltique du produit final Ce module metteur est autoris uniquement pour une utilisation dans un dispositif o l'antenne peut tre installe de telle sorte qu'une distance de 20cm peut tre maintenue entre l'antenne et les utilisateurs. Le produit final doit tre tiquet dans un endroit visible avec l'inscription suivante: "Contient des IC: 10224A-2021BC660GL ". Manual Information to the End User The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the users manual of the end product which integrates this module. The end user manual shall include all required regulatory information/warning as show in this manual. Manuel d'information l'utilisateur final L'intgrateur OEM doit tre conscient de ne pas fournir des informations l'utilisateur final quant la faon d'installer ou de supprimer ce module RF dans le manuel de l'utilisateur du produit final qui intgre ce module. Le manuel de l'utilisateur final doit inclure toutes les informations rglementaires requises et avertissements comme indiqu dans ce manuel.

QUECTEL BC660K-GL XX Q1-AXXXX KKKXKKKKAKKK KKK KAKKK SN: XXKXXXXXXKXKAKXKKK IMEI: XXXXXXXXXKXKKXAXKK CE FCC ID: XMR2021BC660KGL IC: 10224A-2021BC660GL

Quectel Wireless Solutions Company Limited Building 5, Shanghai Business Park Phase III (Area B), No.1016 Tianlin Road, Minhang District, Shanghai, China 200233 Declaration of authorization Date: 2021.04.01 Product Name: NB-IoT Module Model No.: BC660K-GL FCC ID: XMR2021BC660KGL We, the undersigned, hereby authorize MRT Technology (Suzhou) Co., Ltd to act on our behalf, to act on our behalf in all manners relating to FCC approval of our products: report submittal, related correspondence, the signing of all documents relating to these matters, and any other lawful activity necessary to obtain such certification. Any act carried out by MRT Technology (Suzhou) Co., Ltd within the scope of this authorization shall have the same effects as our own. Name Representative of agent: Marlin Chen Agent Company name: MRT Technology (Suzhou) Co., Ltd Address: D8 Building, Youxin Industrial Park, No.2 Tian'edang Rd., Wuzhong Economic Development Zone, City: Suzhou Country: China If you have any questions regarding the authorization, please dont hesitate to contact us. Sincerely yours, Jean Hu Quectel Wireless Solutions Company Limited. TEL: +86-21-51086236 ext 6511

Quectel Wireless Solutions Company Limited Building 5, Shanghai Business Park Phase III (Area B), No.1016 Tianlin Road, Minhang District, Shanghai, China 200233 Declaration of authorization Date: 2021.04.01 Product Name: NB-IoT Module Model No.: BC660K-GL FCC ID: XMR2021BC660KGL RE: Description of Permissive Change To Whom It May Concern:

We, Quectel Wireless Solutions Company Limited to request a Class II permissive change for NB-IoT Module, FCC ID: XMR2021BC660KGL to disable Band 14 via software, original FCC grant on 01/27/2021. If you have any questions regarding this application, please feel free to contact me If you have any questions regarding the authorization, please dont hesitate to contact us. Sincerely yours, Jean Hu Quectel Wireless Solutions Company Limited. TEL: +86-21-51086236 ext 6511

Quectel Wireless Solutions Company Limited Building 5, Shanghai Business Park Phase III (Area B), No.1016 Tianlin Road, Minhang District, Shanghai, China 200233 Confidentiality Letter Date: 2021.04.01 Federal Communications Commission Authorization and Evaluation Division FCC ID: XMR2021BC660KGL Confidentiality Request customarily released to the public. Operational Description Tune- up Procedure Pursuant to FCC 47 CRF 0.457(d) and 0.459, we request that a part of the subject FCC application listed below be held permanently confidential and permanently withheld from public review due to materials that contain trade secrets and proprietary information not Further, the Applicant has spent substantial effort in developing this product, some aspects of which are deemed to be trade secret and proprietary. Having the subject information easily available to our competitors in this market would negate the advantage we have achieved by developing this product. Not protecting the details of the design will result in financial hardship. Sincerely yours, Jean Hu Quectel Wireless Solutions Company Limited. TEL: +86-21-51086236 ext 6511

Quectel Wireless Solutions Company Limited Building 5, Shanghai Business Park Phase III (Area B), No.1016 Tianlin Road, Minhang District, Shanghai, China 200233 Request for Modular/Limited Modular Approval Date: April 2, 2021 Subject: Manufacturers Declaration for Confidentiality Request for: XMR2021BC660KGL

- Modular Approval

- Split Modular Approval

- Limited Modular Approval - Limited Split Modular Approval 8 Basic Requirements FCC Part 15.212(a)(1) For Items Marked NO(*), the Limited Module Description Must be Filled Out on the Following Pages Modular Approval Requirement 1. The modular transmitter must have its own RF shielding. This is intended to ensure that the module does not have to rely upon the shielding provided by the device into which it is installed in order for all modular transmitter emissions to comply with FCC limits. It is also intended to prevent coupling between the RF circuitry of the module and any wires or circuits in the device into which the module is installed. Such coupling may result in non-compliant operation. The physical crystal and tuning capacitors may be located external to the shielded radio elements. 15.212(a)(1)(i) Details: <example The module contains a metal shield which covers all RF components and circuitry. The shield is located on the top of the board next to antenna connector>

Requirement Met

- YES - NO(*) 2. The modular transmitter must have buffered modulation/data inputs (if such inputs are provided) to ensure that the module will comply with FCC requirements under conditions of excessive data rates or over-modulation. 15.212(a)(1)(ii) Details: <example Data to the modulation circuit is buffered as described in the operational description provided with the application>

- YES - NO(*) 3. The modular transmitter must have its own power supply regulation on the module. This is intended to ensure that the module will comply with FCC requirements regardless of the design of the power supplying circuitry in the device into which the module is installed. 15.212(a)(1)(iii) Details: <example The module contains its own power supply regulation. Please refer to schematic filed with this application>

- YES - NO(*) 4. The modular transmitter must comply with the antenna and transmission system requirements of 15.203, 15.204(b), 15.204(c), 15.212(a), and 2.929(b). The antenna must either be permanently attached or employ a unique antenna coupler (at all connections between the module and the antenna, including the cable). The professional installation provision of 15.203 is not applicable to modules but can apply to limited modular approvals under paragraph 15.212(b). 15.212(a)(1)(iv) Details: <example The module connects to its antenna using an UFL connector which is considered a non-

standard connector. A list of antennas tested and approved with this device may be found in users manual provided with the application>

- YES - NO(*) 5. The modular transmitter must be tested in a stand-alone configuration, i.e., the module must not be inside another device during testing. This is intended to demonstrate that the module is capable of complying with Part 15 emission limits regardless of the device into which it is eventually installed. Unless the transmitter module will be battery powered, it must comply with the AC line conducted requirements found in Section 15.207. AC or DC power lines and data input/output lines connected to the module must not contain ferrites, unless they will be marketed with the module (see Section 15.27(a)). The length of these lines shall be length typical of actual use or, if that length is unknown, at least 10 centimeters to insure that there is no coupling between the case of the module and supporting equipment. Any accessories, peripherals, or support equipment connected to the module during testing shall be unmodified or commercially available (see Section 15.31(i)). 15.212(a)(1)(v) Details: <example The module was tested stand-alone as shown in test setup photographs filed with this application>

- YES - NO(*) 6. The modular transmitter must be labeled with its own FCC ID number, or use an electron Modular Approval Requirement Requirement Met display (see KDB Publication 784748). If using a permanently affixed label with its own FCC ID number, if the FCC ID is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module. This exterior label can use wording such as the following: Contains Transmitter Module FCC ID:

XMR2021BC660KGL or Contains FCC ID: XMR2021BC660KGL Any similar wording that expresses the same meaning may be used. The Grantee may either provide such a label, an example of which must be included in the application for equipment authorization, or, must provide adequate instructions along with the module which explain this requirement. In the latter case, a copy of these instructions must be included in the application for equipment authorization. If the modular transmitter uses an electronic display of the FCC identification number, the information must be readily accessible and visible on the modular transmitter or on the device in which it is installed. If the module is installed inside another device, then the outside of the device into which the module is installed must display a label referring to the enclosed module. This exterior label can use wording such as the following: Contains FCC certified transmitter module(s). Any similar wording that expresses the same meaning may be used. The user manual must include instructions on how to access the electronic display. A copy of these instructions must be included in the application for equipment authorization. 15.212(a)(1)(vi) Details: <example There is a label on the module as shown in the labeling exhibit filed with this application. Host specific labeling instructions are shown in the installation manual .filed with this application.>

- YES - NO(*) 7. The modular transmitter must comply with all specific rule or operating requirements applicable to the transmitter, including all the conditions provided in the integration instructions by the grantee. A copy of these instructions must be included in the application for equipment authorization. For example, there are very strict operational and timing requirements that must be met before a transmitter is authorized for operation under Section 15.231. For instance, data transmission is prohibited, except for operation under Section 15.231(e), in which case there are separate field strength level and timing requirements. Compliance with these requirements must be assured. 15.212(a)(1)(vii) Details: <example The module complies with FCC Part 15C requirements. Instructions to the OEM installer are provided in the installation manual filed with this application.>

- YES - NO(*) 8. The modular transmitter must comply with any applicable RF exposure requirements. For example, FCC Rules in Sections 2.1091, 2.1093 and specific Sections of Part 15, including 15.319(i), 15.407(f), 15.253(f) and 15.255(g), require that Unlicensed PCS, UNII and millimeter wave devices perform routine environmental evaluation for RF Exposure to demonstrate compliance. In addition, spread spectrum transmitters operating under Section 15.247 are required to address RF Exposure compliance in accordance with Section 15.247(b)(4). Modular transmitters approved under other Sections of Part 15, when necessary, may also need to address certain RF Exposure concerns, typically by providing specific installation and operating instructions for users, installers and other interested parties to ensure compliance. 15.212(a)(1)(viii) Details: < The module meets RF exposure in mobile configuration.>

- YES - NO(*) 070920-02b Limited Module Description When Applicable

* If a module does NOT meet one or more of the above 8 requirements, the applicant may request Limited Modular Approval

(LMA). This Limited Modular Approval (LMA) is applied with the understanding that the applicant will demonstrate and will retain control over the final installation of the device, such that compliance of the end product is always assured. The operating condition(s) for the LMA; the module is only approved for use when installed in devices produced by grantee. A description regarding how control of the end product, into which the module will be installed, will be maintained by the applicant/manufacturer, such that full compliance of the end product is always ensured should be provided here. Details: <example - N/A>

Software Considerations KDB 594280 / KDB 442812 (One of the following 2 items must be applied) Requirement 1. For non-Software Defined Radio transmitter modules where software is used to ensure compliance of the device, technical description must be provided about how such control is implemented to ensure prevention of third-party modification; see KDB Publication 594280. Details: <example The firmware of the device can not be modified or adjusted by the end user as described in a separate cover letter filed with this application. >

- Provided in Separate Cover Letter Requirement Met

- N/A 2. For Software Defined Radio (SDR) devices, transmitter module applications must provide a software security description; see KDB Publication 442812.

- Provided in Separate Cover Letter

- N/A Details: <example N/A>

Requirement 1. For split modular transmitters, specific descriptions for secure communications Provided in Manual Split Modular Requirements between front-end and control sections, including authentication and restrictions on third-party modifications; also, instructions to third-party integrators on how control is maintained. Details: <example N/A >

- Provided in Separate Cover Letter

- N/A 070920-02b OEM Integration Manual Guidance KDB 996369 D03 Section 2 Clear and Specific Instructions Describing the Conditions, Limitations, and Procedures for third-parties to use and/or integrate the module into a host device. Requirement

- YES Is this module intended for sale to third parties?

- No, If No, and LMA applies, the applicant can optionally choose to not make the following detailed info public. However there still needs to be basic integration instructions for a users manual and the information below must still be included in the operational description. If the applicant wishes to keep this info confidential, this will require a separate statement cover letter explaining the module is not for sale to third parties and that integration instructions are internal confidential documents. Items required to be in the manual See KDB 996369 D03, Section 2 As of May 1, 2019, the FCC requires ALL the following information to be in the installation manual. Modular transmitter applicants should include information in their instructions for all these items indicating clearly when they are not applicable. For example information on trace antenna design could indicate Not Applicable. Also if a module is limited to only a grantees own products and not intended for sale to third parties, the user instructions may not need to be detailed and the following items can be placed in the operational description, but this should include a cover letter as cited above. 1. List of applicable FCC rules. KDB 996369 D03, Section 2.2 a. Only list rules related to the transmitter. 2. Summarize the specific operational use conditions. KDB 996369 D03, Section 2.3 a. Conditions such as limits on antennas, cable loss, reduction of power for point to 3. Limited Module Procedures. KDB 996369 D03, Section 2.4 point systems, professional installation info a. Describe alternative means that the grantee uses to verify the host meets the necessary limiting conditions b. When RF exposure evaluation is necessary, state how control will be maintained such that compliance is ensured, such as Class II for new hosts, etc. 4. Trace antenna designs. KDB 996369 D03, Section 2.5 a. Layout of trace design, parts list, antenna, connectors, isolation requirements, tests for design verification, and production test procedures for ensuring compliance. If confidential, the method used to keep confidential must be identified and information provided in the operational description. 5. RF exposure considerations. KDB 996369 D03, Section 2.6 a. Clearly and explicitly state conditions that allow host manufacturers to use the module. Two types of instructions are necessary: first to the host manufacturer to define conditions (mobile, portable xx cm from body) and second additional text needed to be provided to the end user in the host product manuals. 6. Antennas. KDB 996369 D03, Section 2.7 a. List of antennas included in the application and all applicable professional installer instructions when applicable. The antenna list shall also identify the antenna types (monopole, PIFA, dipole, etc note that omni-directional is not considered a type) 7. Label and compliance information. KDB 996369 D03, Section 2.8 a. Advice to host integrators that they need to provide a physical or e-label stating Contains FCC ID: with their finished product 8. Information on test modes and additional testing requirements. KDB 996369 D03, Section 2.9 a. Test modes that should be taken into consideration by host integrators including clarifications necessary for stand-alone and simultaneous configurations. b. Provide information on how to configure test modes for evaluation 9. Additional testing, Part 15 Subpart B disclaimer. KDB 996369 D03, Section 2.10

- All Items shown to the left are provided in the Modular Integration Guide (or UM) for Full Modular Approval (MA) or LMA.

- An LMA applies and is approved ONLY for use by the grantee in their own products, and not intended for sale to 3rd parties as provided in a separate cover letter. Therefore the information shown to the left is found in the theory of operation. Sincerely, Quectel Wireless Solutions Company Limited. TEL: +86-21-51086236 ext 6511 070920-02b

Quectel Wireless Solutions Company Limited Building 5, Shanghai Business Park Phase III (Area B), No.1016 Tianlin Road, Minhang District, Shanghai, China 200233 Confidentiality Letter Date: 2021.01.15 Federal Communications Commission Authorization and Evaluation Division FCC ID: XMR2021BC660KGL Confidentiality Request customarily released to the public. Operational Description Parts List Tune up procedure Block Diagram Schematics Pursuant to FCC 47 CRF 0.457(d) and 0.459, we request that a part of the subject FCC application listed below be held permanently confidential and permanently withheld from public review due to materials that contain trade secrets and proprietary information not Further, the Applicant has spent substantial effort in developing this product, some aspects of which are deemed to be trade secret and proprietary. Having the subject information easily available to our competitors in this market would negate the advantage we have achieved by developing this product. Not protecting the details of the design will result in financial hardship. Sincerely yours, Jean Hu Quectel Wireless Solutions Company Limited. TEL: +86-21-51086236 ext 6511