FCC ID: SRQ-MW3650 WCDMA Module

Hardware Development Guide of Module Product MW3650 Version V1.0, 2015-09-28 MW3650 0 Hardware Development Guide of Module Products Legal Information By receiving the document from Shenzhen ZTEWelink Technology Co., Ltd (shortly referred to as ZTEWelink), you are deemed to have agreed to the following terms. If you dont agree to the following terms, please stop using the document. Copyright 2015 Shenzhen ZTEWelink Technology Co., Ltd. All rights reserved. The document contains ZTEWelinks proprietary information. Without the prior written permission of ZTEWelink, no entity or individual is allowed to reproduce, transfer, distribute, use and disclose this document or any image, table, data or other information contained in this document. is the registered trademark of ZTEWelink. The name and logo of ZTEWelink are ZTEWelinks trademark or registered trademark. Meanwhile, ZTEWelink is granted to use ZTE Corporations registered trademark. The other products or company names mentioned in this document are the trademark or registered trademark of their respective owner. Without the prior written permission of ZTEWelink or the third-party oblige, no one is allowed to read this document. The product meets the design requirements of environmental protection and personal security. The storage, use or disposal of products should abide by the product manual, relevant contract or the laws and regulations of relevant country. ZTEWelink reserves the right to make modifications on the product described in this document without prior notice, and keeps the right to revise or retrieve the document any time. If you have any question about the manual, please consult the company or its distributors promptly. All Rights reserved, No Spreading abroad without Permission of ZTEWelink II MW3650 0 Hardware Development Guide of Module Products Revision History Version Date Description 1.0 2015-09-28 1st released version All Rights reserved, No Spreading abroad without Permission of ZTEWelink III MW3650 0 Hardware Development Guide of Module Products Contents Figures ................................................................................................................................................. VII Tables ................................................................................................................................................. VIII 1 About This Document .................................................................................................................. 10 1.1 1.2 1.3 1.4 Application Range ......................................................................................................... 10 Purpose .......................................................................................................................... 10 Supported & Reference Documents List ....................................................................... 11 Abbreviations ................................................................................................................ 11 2 Product Overview ......................................................................................................................... 13 2.1 2.2 Technical Parameters ..................................................................................................... 14 Function Overview ........................................................................................................ 16 2.2.1 Baseband Function ................................................................................................ 16 2.2.2 Radio Frequency Function .................................................................................... 16 3 Mechanic Features ....................................................................................................................... 18 3.1 3.2 3.3 3.4 3.5 Module Illustration ........................................................................................................ 18 Module hex-vision images ............................................................................................ 19 Module Main Board PCB Encapsulation Dimension Diagram ..................................... 19 PCB Design Guidelines ................................................................................................. 21 Suggestions for Heat-dissipation Design ....................................................................... 22 4 Interfaces....................................................................................................................................... 23 4.1 4.2 4.3 4.4 Definition of PINs ......................................................................................................... 23 Hardware interface description ...................................................................................... 27 Ground ........................................................................................................................... 28 Power Interface .............................................................................................................. 28 4.4.1 V_MAIN PINS ..................................................................................................... 28 4.4.2 VREF PINS ........................................................................................................... 30 4.4.3 Power interface PCB Layout and Wiring Guidance .............................................. 30 4.5 Power-on/Power-off & Reset......................................................................................... 31 4.5.1 Power On .............................................................................................................. 31 All Rights reserved, No Spreading abroad without Permission of ZTEWelink IV MW3650 0 Hardware Development Guide of Module Products 4.5.2 Power Off .............................................................................................................. 31 4.5.3 Reset ...................................................................................................................... 32 4.5.4 Power-on/Power-off Flow ..................................................................................... 32 4.6 4.7 4.8 4.9 4.10 4.11 4.12 UART Interface ............................................................................................................. 34

(U)SIM Card Interface .................................................................................................. 36 USB Interface ................................................................................................................ 38 Working Status Indicator Interface ................................................................................ 39 SPI Bus Interface ........................................................................................................... 40 I2C Bus .......................................................................................................................... 41 User Interface ................................................................................................................ 42 5 Antenna ......................................................................................................................................... 43 5.1 5.2 5.3 5.4 5.5 5.6 Preliminary Antenna Evaluation .................................................................................... 43 Antenna Design Guidance ............................................................................................. 43 Suggested Antenna Location ......................................................................................... 44 RF PCB wire guidelines ................................................................................................ 45 EMC Requirements ....................................................................................................... 45 Index Requirement of Antenna ...................................................................................... 46 5.6.1 Passive Index of Antenna ...................................................................................... 46 5.6.2 Active Index of Antenna ....................................................................................... 47 5.6.3 OTA Test method of Whole Machine Antenna ...................................................... 48 6 Electric Feature ............................................................................................................................ 49 6.1 6.2 6.3 Interface PWL ............................................................................................................... 49 Power Supply ................................................................................................................ 49 Working Current ............................................................................................................ 49 7 Technical Index of Radio Frequency .......................................................................................... 51 7.1 Index of RF under UMTS Mode ................................................................................... 51 7.1.1 Maximum Transmission Power ............................................................................. 51 7.1.2 Receiving Sensibility ............................................................................................ 52 7.1.3 Spurious Emission Index ....................................................................................... 52 7.2 Index of RF under GPRS/GSM/EDGE Mode ............................................................... 52 7.2.1 Maximum Transmission Power ............................................................................. 53 7.2.2 Receiving Sensibility ............................................................................................ 53 All Rights reserved, No Spreading abroad without Permission of ZTEWelink V MW3650 0 Hardware Development Guide of Module Products 7.2.3 Spurious Emission Index ....................................................................................... 53 8 Related Test & Test Standard ...................................................................................................... 55 8.1 8.2 8.3 8.4 8.5 Testing Reference .......................................................................................................... 55 Description of Testing Environment .............................................................................. 56 Reliability Testing Environment .................................................................................... 56 Reliability Testing Result .............................................................................................. 57 ESD Characteristic ........................................................................................................ 58 9 SMT Process and Baking Guide ................................................................................................. 59 9.1 9.2 9.3 Storage Requirements .................................................................................................... 59 Modules Position Requirements on Main board .......................................................... 59 Module Planeness Standard ........................................................................................... 60 9.3.1 Process Routing Selection ..................................................................................... 60 9.3.2 Solder Paste Selection ........................................................................................... 60 9.3.3 Design of module PADs steel mesh opening on main board................................ 61 9.3.4 Module Boards SMT process ............................................................................... 62 9.3.5 Module Soldering Reflow Curve .......................................................................... 63 9.3.6 Reflow method ...................................................................................................... 64 9.3.7 Maintenance of defects ......................................................................................... 64 9.4 Modules Baking Requirements .................................................................................... 64 9.4.1 Modules Baking Environment ............................................................................. 64 9.4.2 Baking device and operation procedure ................................................................ 65 9.4.3 Module Baking Conditions ................................................................................... 65 10 Safety Warnings and Notes .......................................................................................................... 66 All Rights reserved, No Spreading abroad without Permission of ZTEWelink VI MW3650 0 Hardware Development Guide of Module Products Figures Figure 2-1 System Connection Structure ............................................................................. 16 Figure 4-1 PIN Configuration Diagram ............................................................................... 23 Figure 4-2 Wakeup Waveform .............................................................................................. 26 Figure 4-3 LDO Power Supply ............................................................................................ 29 Figure 4-4 DC/DC Switching Power Supply ....................................................................... 30 Figure 4-5 Power On & Reseting Circuit Reference Diagram ............................................. 31 Figure 4-6 Power-on Sequence Chart of Module ................................................................. 33 Figure 4-7 Power-off Sequence Chart of Module ................................................................ 33 Figure 4-8 UART Interface PWL Conversion Reference Design ........................................ 35 Figure 4-9 Module Serial Port & AP Application Processor ............................................... 35 Figure 4-10 The Connection of UART and Standard RS-232-C Interface .......................... 36 Figure 4-11 (U)SIM Card Console Circuit Reference Design ............................................. 37 Figure 4-12 USB Interface Circuit Reference Design Schematic Diagram ......................... 39 Figure 5-1 Translation Circuit Diagram ............................................................................... 44 Figure 5-2 OTA Test System ............................................................................................... 48 Figure 9-1 Green oil and white oil at modules position on main board .............................. 60 Figure 9-2 Module Boards Steel Mesh Diagram ................................................................ 62 Figure 9-3 Material Module Pallet ....................................................................................... 62 Figure 9-4 Module Furnace Temperature Curve Diagram ................................................... 63 All Rights reserved, No Spreading abroad without Permission of ZTEWelink VII MW3650 0 Hardware Development Guide of Module Products Tables Table 1-1 Support Documents List ...................................................................................... 11 Table 1-2 Abbreviation List ................................................................................................. 11 Table 2-1 Module Frequency band configuration ................................................................ 13 Table 2-2 Major Technical Parameters ................................................................................ 14 Table 2-3 Working Frequency Band .................................................................................... 17 Table 3-1 Product Illustration .............................................................................................. 18 Table 4-1 PIN Interface Definition ...................................................................................... 23 Table 4-2 Voltage Current Characteristic ............................................................................ 29 Table 4-3 Power-on/Power-off Time ................................................................................... 33 Table 4-4 The Definition of UART Signal .......................................................................... 34 Table 4-5 The Definition of USIM Card Interface............................................................... 36 Table 4-6 The Definition of USB PINS ............................................................................... 38 Table 4-7 The Correspondence of Port Map ........................................................................ 39 Table 4-8 Indicator Light Reference Design Schematic Diagram ....................................... 40 Table 4-9 The Description of Working Status Indicator Light ............................................ 40 Table 4-10 The Definition of SPI Interface ......................................................................... 40 Table 4-11 I2C Reference Circuit Design ............................................................................ 41 Table 5-1 The Passive Index Reference of Main Antenna about PAD product ................... 46 Table 5-2 The Passive Index Reference of Diversity Antenna about PAD product ............ 46 Table 5-3 Recommended Product OTA Index Requirement ............................................... 47 Table 6-1 Main Out ward Interface PWL of Module ........................................................... 49 Table 6-2 Input Voltage ....................................................................................................... 49 Table 6-3 The Current Consumption under Sleep Mode ..................................................... 50 Table 6-4 The Working Current of MODULE .................................................................... 50 Table 7-1 Maximum Transmission Power ........................................................................... 51 Table 7-2 Reference of Receiving Sensitivity ...................................................................... 52 Table 7-3 Spurious Emission Index ..................................................................................... 52 Table 7-4 Maximum Transmission Power of GSM850/900/1800/1900 (GMSK/8PSK) .... 53 Table 7-5 Receiving Sensitivity ........................................................................................... 53 Table 8-1 Testing Standard .................................................................................................. 55 Table 8-2 Testing Environment ........................................................................................... 56 Table 8-3 Testing Instrument & Device ............................................................................... 56 Table 8-4 Reliability Features .............................................................................................. 56 Table 8-5 The Temperature Testing Result Under Windless Condition .............................. 57 Table 8-6 The High/low Temperature Running and Storage Testing Result ....................... 57 Table 8-7 Module ESD Features .......................................................................................... 58 Table 9-1 Baking parameters ............................................................................................... 59 Table 9-2 LCC module PADs steel mesh opening ............................................................. 61 All Rights reserved, No Spreading abroad without Permission of ZTEWelink VIII MW3650 0 Hardware Development Guide of Module Products R&TTE Regulation:

In all cases assessment of the final product must be mass against the Essential requirements of the R&TTE Directive Articles 3.1(a) and (b), safety and EMC respectively, as well as any relevant Article 3.2 requirements. Hereby, ZTE CORPORATION declares that this product is in complies with the essential requirements of Article 3 of the R&TTE 1999/5/EC Directive. All Rights reserved, No Spreading abroad without Permission of ZTEWelink IX MW3650 0 Hardware Development Guide of Module Products 1 About This Document 1.1 Application Range This document is applicable as the hardware development guide of MW3650 module produce. Users need to design products according to the requirement and guide of this document. This document only can be applied to the hardware application development of MW3650 module product. 1.2 Purpose This document provides the hardware solutions and development fundamentals for a product with the module. By reading this document, the user can have an overall knowledge of the module and a clear understanding of the technical parameters. With this document, the user can successfully fulfill the application and development of 3G wireless Internet product or equipment. Besides the product function features and technical parameters, this document also provides the product reliability tests and related testing standards, business function realization process, RF performance indexes and a guide on the design of user circuits, to provide the user with a complete design reference.

NOTE:

At present, our company has a large number of module products. Users may come across many module board welding problems when using the module. To ensure the module board welding first pass yield and guarantee the module manufacturing and welding quality in the following integration process, please do as the chapter 9 of Manufacturing Guide in this document. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 10 MW3650 0 Hardware Development Guide of Module Products 1.3 Supported & Reference Documents List Besides this hardware development guide, we also provide the Datasheet document, software development guide and AT command reference guide. Table 1-1 is the support document list. Table 1-1 Support Documents List Document NO. Document Name 1 2 3 ZTEWelink Software Development Guide of Module Product(MG3732_V2A&MW3650).pdf ZTEWelink MW3650 Datasheet.pdf AT Command reference guide for ZTEWelink MG3732_V2A,MW3650 Module.pdf 1.4 Abbreviations Table 1-2 is a list of abbreviations involved in this document, as well as the English full names. Table 1-2 Abbreviation List Abbreviations Full Name ADC ARP BER BTS Analog-Digital Converter Antenna Reference Point Bit Error Rate Base Transceiver Station CDMA Code Division Multiple Access CS CSD CPU DAC DCE DSP DTE DTMF DTR EGSM EMC Coding Scheme Circuit Switched Data Central Processing Unit Digital-to-Analog Converter Data Communication Equipment Digital Signal Processor Data Terminal Equipment Dual Tone Multi-Frequency Data Terminal Ready Enhanced GSM Electromagnetic Compatibility All Rights reserved, No Spreading abroad without Permission of ZTEWelink 11 Abbreviations Full Name MW3650 0 Hardware Development Guide of Module Products EMI ESD ETS FDMA FR GPRS GSM IC IMEI ISO ITU LCD LED MCU PCB PCL PCS PDU PPP RAM RF ROM RTC SIM SMS SPI TE UART UIM USB UMTS Electro Magnetic Interference Electronic Static Discharge European Telecommunication Standard Frequency Division Multiple Access Full Rate General Packet Radio Service Global Standard for Mobile Communications Integrated Circuit International Mobile Equipment Identity International Standards Organization International Telecommunications Union Liquid Crystal Display Light Emitting Diode Machine Control Unit Printed Circuit Board Power Control Level Personal Communication System Protocol Data Unit Point-to-point protocol Random Access Memory Radio Frequency Read-only Memory Real Time Clock Subscriber Identification Module Short Message Service Serial Peripheral Interface Terminal Equipment also referred it as DTE Universal asynchronous receiver-transmitter User Identifier Management Universal Serial Bus Universal Mobile Telecommunication System WCDMA Wideband Code Division Multi Access All Rights reserved, No Spreading abroad without Permission of ZTEWelink 12 MW3650 0 Hardware Development Guide of Module Products 2 Product Overview MW3650 is a WCDMA/HSDPA/GSM/GPRS/EDGE industry module developed by our company, and it is a wireless Internet module with LCC interface. The module has voice(optional), short message and data service functions. The downlink peak data rate is 3.6Mbps and the uplink peak data rate is 384Kbps, so it can supply the users with economical high speed internet access business, wireless data business and so on. It is widely applied to but not limited to the various products and equipment such as modem, embedded module, wireless phone, multimedia phone and touch screen communication device, PAD, vehicle-mounted terminals and electric consumed devices, using the MW3650 module. The function features of this module are described as bellow:

1) Support UMTS/HSDPA 850(900)/1900/2100MHz frequency band, GSM/GPRS/EDGE 850/900/

1800/1900MHz frequency band. 2) Can supply GSM/GPRS/EDGE and UMTS/HSDPA high speed data access service in a mobile environment. 3) Support SMS and voice functions. 4) Supply (U)SIM card interface (3.0V/1.8V), USB2.0 interface, 8-wire UART (compatible with 2-wire UART), power on/off, reset and so on. Taking MW3650 module as an example, this document introduces the logical structure, hardware interfaces and main function in detail. It also supplies the corresponding design reference of hardware and structure.

NOTE:

At present, the frequency band of MW3650 module in UMTS mode can take proper tailoring or configuration according to the corresponding requirement of customers as is shown blow. Table 2-1 Module Frequency band configuration Configuration GSM Bands WCDMA Bands MW3650V1A 850/1900MHz MW3650V1B 900/1800MHz MW3650V1C 900/1800MHz 1900/850MHz 2100/900MHz 2100MHz All Rights reserved, No Spreading abroad without Permission of ZTEWelink 13 MW3650 0 Hardware Development Guide of Module Products 2.1 Technical Parameters The major features of the module can be described from the aspects of mechanic feature, base band, radio frequency, technical standard, environment features and so on. Table below is a list of the major technical parameters and features supported by module. Table 2-2 Major Technical Parameters Type Item Specifications Dimensions (L W H) 30.0mm 30..0mm 2.3mm Mechanical Feature Weight About 5g Encapsulation type LCC with 80 pins

(U)SIM/SIM Standard SIM card interface 3V SIM card and 1.8V SIM card USB interface USB 2.0 HIGH SPEED UART interface 8-wire UART Max Power Dissipation About 2.2W Baseband Power Supply DC 3.3~4.2V, typical value is 3.8V Peak current About 0.6A Working Current2 The average current in normal working Standby current About 540mA@UMTS 2100 About 239mA@GSM 900 About 5mA@UMTS About 5mA@GSM GSM Frequency Band EDGE/GPRS/GSM1900/1800/900/850MHz UMTS Frequency Band HSDPA/WCDMA2100/1900/850(900)MHz;

Diversity Reception Frequency Band NA1 RF UMTS2100/1900/900/850: Power Class 3 (+24dBm

+2.5/-1.5dBm) GSM/GPRS 850MHz/900MHz: Power Class 4 (+33dBm +

2.5/-0.5 dBm) Max. Transmitter Power GSM/GPRS 1800MHz/1900MHz: Power Class 1 (+30dBm

+2.5/-0.5 dBm) EDGE 850MHz/900MHz: Power Class E2 (+27dBm

+4.5/-1.5dBm) EDGE 1800MHz/1900MHz: Power Class E2 (+26dBm

+4.5/-2.5dBm) All Rights reserved, No Spreading abroad without Permission of ZTEWelink 14 MW3650 0 Hardware Development Guide of Module Products Type Item Specifications Receiving sensitivity WCDMA2100 : -108dBm WCDMA1900 : -109dBm WCDMA900 : -109dBm WCDMA850 : -109 dBm GSM850/900/1800/1900 : -107dBm Main Antenna External, Provide Antenna PAD Data Rate HSDPA Protocol GSM CS: UL 9.6kbps/DL 9.6kbps GPRS: Multi-slot Class 10 EDGE: Multi-slot Class 12 WCDMA CS: UL 64kbps/DL 64kbps WCDMA PS: UL 384kbps/DL 384kbps HSDPA: DL 3.6Mb/s(Category 6) HSDPA/WCDMA/EDGE/GPRS/GSM 3GPP Protocol R5, R4, R99 OS Windows XP (SP2 and later) Windows Vista & 7 WinCE Linux Android Technical Standard Environmen t Feature3 Working Temperature

-30 ~ 75 C Storage Temperature

-40 ~ 85 C Application Humidity DATA SMS Voice MMS TCP/IP UDP/IP Phonebook Upgrade 5%~ 95%

Support Support ultra-long SMS Support Text and PDU mode Point to point MO and MT Support Support (Not support built-in MMS protocol stack temporarily) Support Support Support Support All Rights reserved, No Spreading abroad without Permission of ZTEWelink 15 MW3650 0 Hardware Development Guide of Module Products

NOTE:

NA indicates nonsupport. Working current value is the average value tested under the max transmitter power. The value may be different in different condition and environment. Please take the actual measurement as the reference. Please make sure that the module is started up in the recommended working current range and working temperature to avoid the damage or the abnormal working of the module. 2.2 Function Overview 2.2.1 Baseband Function When connected with the system board, the module mainly includes the following signal groups: USB signal, (U)SIM card signal, status querying signal, UART signal, module power-on/resetting signal, main antenna interface and power-supply interface. Figure below is the system connection structure. Figure 2-1 System Connection Structure 2.2.2 Radio Frequency Function The working frequency band of module is shown in the table below. a) Support HSDPA/WCDMA 850(900)/1900/2100MHz. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 16 MW3650 0 Hardware Development Guide of Module Products b) Support GSM/EDGE/GPRS 850/900/1800/1900MHz. c) The highest downlink rate supported by HSDPA is 3.6Mbit/s. d) PS domain supports EDGE CLASS12/GPRS CLASS10 bearer service. e) CS domain supports 64Kbit/s data service in WCDMA mode. Table 2-3 Working Frequency Band Working Frequency Band Uplink Frequency Band Downlink Frequency Band UMTS850 (band V) 824 MHz 849 MHz 869 MHz 894 MHz UMTS900 (band VIII) 880 MHz 915 MHz 925 MHz 960 MHz UMTS1900 (band II) 1850 MHz 1910 MHz 1930 MHz 1990 MHz UMTS2100 (band I) 1920 MHz 1980 MHz 2110 MHz 2170 MHz GSM850 GSM900 GSM1800 GSM1900 824 MHz 849MHz 869 MHz 894 MHz 890 MHz 915MHz 925 MHz 960MHz 1710 MHz 1785MHz 1805 MHz 1880MHz 1850 MHz 1910MHz 1930 MHz 1990MHz All Rights reserved, No Spreading abroad without Permission of ZTEWelink 17 MW3650 0 Hardware Development Guide of Module Products 3 Mechanic Features 3.1 Module Illustration The Product Illustration of module is shown in the Figure 3-1. Table 3-1 Product Illustration

NOTE:

The picture above is just for reference; please take the actual products as the reference.

Dimensions (L W H): 30.0 mm 30.0mm 2.3mm

Weight: about 5g. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 18 MW3650 0 Hardware Development Guide of Module Products Module hex-vision images 3.2 The module hex-vision images are shown in figure 3-2 (units: mm). Figure 3-2 module hex-vision images Note: the height in the figure above is without the module label, so it is 2.2mm. 3.3 Module Main Board PCB Encapsulation Dimension Diagram The detailed dimension of PCB welding panel is shown in figure 3-3 (units: mm). All Rights reserved, No Spreading abroad without Permission of ZTEWelink 19 MW3650 0 Hardware Development Guide of Module Products Figure 3-3 The detailed dimension of PCB welding panel Figure 3-4 Recommended Welding Panel Design Dimension of Customer Interface Board All Rights reserved, No Spreading abroad without Permission of ZTEWelink 20 MW3650 0 Hardware Development Guide of Module Products Figure 3-5 PCB Bottom Welding Panel 3.4 PCB Design Guidelines To ensure the module has good performance in the application process, the users of modules should do as the following guidelines in the process of PCB wire designing:

1) For testing and maintenance convenience, the customer dev board PCB should be hollowed out to show the test pionts as is shown in the red box in figure 3-5 so as to do JTAG installation and debugging. 2) The rest round test points are used for module power supply and calibration in SMT production process. Do not short out these test points when connect the module to main board. 3) In the design process, the strongly disturbing signals such as clock signal, high-frequency digital signal and switching signal of switch power supply should be placed far away from the module. 4) Please pay attention to the protection of RF and audio analog signal. If condition permits, it is better to separate the analog ground and digital ground. After the separation, the signal line or power line should not pass over the separation channel. 5) To ensure the integrity and circulation ability, if condition permits, it is better to adopt planar form. 6) Please ensure the integrity of the module ground to reduce the leak of disturbing signal. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 21 MW3650 0 Hardware Development Guide of Module Products Suggestions for Heat-dissipation Design 3.5 The module will dissipate heat during the working process, and might also be affected by other high-temperature devices. When do the heat-dissipation design, please pay attention to the following items:

1) Place this product far away from the switch power supply and high speed signal line, and protect the wiring of these interference sources. 2) Place the antenna and coaxial-cable connecting the network card and antenna far away from these interference sources. 3) Place the module far away from the devices that have high calorific power such as CPU and Southbridge to avoid the influencing the RF performance because of the temperature rise. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 22 MW3650 0 Hardware Development Guide of Module Products 4 Interfaces 4.1 Definition of PINs The definition of interface PINs on module is shown in figure 4-1. Figure 4-1 PIN Configuration Diagram Table 4-1 PIN Interface Definition PIN Classification Signal Definition I/O Description 1 POWER_ON ON/OFF I Power on/off Remark Pull-up internally, low pulse active All Rights reserved, No Spreading abroad without Permission of ZTEWelink 23 MW3650 0 Hardware Development Guide of Module Products RESET Reserved PIN Classification Signal Definition PON_RESET_N 2 3 GND VREF_2V8 4 VREF_1V8 5 NC 6 7 GPIO GPIO 8 GND 9 10 NC GND 11 Reserved 12 13 Reserved Reserved 14 Reserved 15 16 Reserved Reserved 17 Reserved 18 Reserved 19 20 GND GND 21 VBUS 22 23 USB_DM USB_DP 24 NC 25 26 NC NC 27 NC 28 29 NC NC 30 31 GND USB 32 33 34 35 36 37 SPI_MISO_DATA

--

SPI_MOSI_DATA

--

SPI SPI_CLK I/O SPI_CS_N GND USIM USIM_CLK O I/O Description Reset signal I

--

GND Voltage output O Voltage output O

--

--

I/O GPIO I/O GPIO GND

--

--

--

GND

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

GND GND

--

I USB power I/O USB data-

I/O USB data +

--

--

--

--

--

--

--

--

--

--

--

--

--

GND Main input, slave output Main input, slave output SPI interface clock signal I/O SPI strobe signal

--

GND USIM card clock line Remark 1.8V low level active

--

2.85V 1.8V

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

5V

--

--

--

--

--

--

--

--

--

1.8V 1.8V 1.8V 1.8V

--

1.8V/3.0V All Rights reserved, No Spreading abroad without Permission of ZTEWelink 24 MW3650 0 Hardware Development Guide of Module Products PIN Classification Signal Definition I/O Description Remark USIM_DATA I/O 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 O O I

--

--

--

--

--

I I

--

I I

--

O I O I O I O O USIM_RST VREG_USIM USIM_DETECT Reserved Reserved Reserved Reserved GND ADC2 ADC1 GND V_MAIN V_MAIN GND UART_TXD UART_RXD UART_RTS UART_CTS UART_DSR UART_DTR UART_DCD UART_RI GND RF_ANT GND GPIO Reserved ADC UART ANT USIM card data line USIM card reset signal USIM 1.8/3V power supply USIM card detect signal

--

--

--

--

1.8V/3.0V 1.8V/3.0V 1.8V/3.0V 1.8V

--

--

--

--

DTE transmit serial data DTE receive serial data

--

3.3V-4.2V 3.3V-4.2V

--

0-VCC 0-VCC

--

GND ADC ADC GND Module main power supply Module main power supply GND UART Transmit Data UART Receive Data Ready for sending DCE Request to send Ready for receiving UART DCE get ready UART DTE get ready UART Carrier detects UART Ring Indicator GND DCE get ready DTE get ready

--

Notify DTE the remote call

--

--

--

--

--

I/O Antenna interface

--

GND I/O GPIO All Rights reserved, No Spreading abroad without Permission of ZTEWelink 25 MW3650 0 Hardware Development Guide of Module Products PIN Classification Signal Definition 65 66 67 68 GPIO GPIO NC NC 69 WWAN_STATE O I/O Description I/O GPIO I/O GPIO

--

--

--

--

Network status index signal 70 SIG_LED O Module status indicator light WAKEUP_OUT O WAKEUP_IN I I2C I2C_SCL I2C_SDA GPIO GPIO GPIO GND NC GND output wakeup signal Input wakeup signal I2C clock line I2C data line I I/O I/O GPIO I/O GPIO I/O GPIO GND

--

--

--

GND

--

71 72 73 74 75 76 77 78 79 80

NOTE:

Remark

--

--

--

--

1. Power-on status:

indicator light off;

2. network searching status: indicator light flickers with the frequency of 3Hz;

3.Standyby status:

indicator light flickers with the frequency of 1Hz;

4.Service status: indicator light flickers with the frequency of 5Hz.

--

--

1.8V 1.8V

--

--

--

--

--

--

WAKEUP is USB wake-up PIN in default. If the main controller needs to be waked up after a trigger event (such as SMS arrive) happens, a low-high-low PWL change is generated and each state lasts 1s. Then the level of this pin changes to high level. Then main controller needs to issues USB wake-up command to wake up the module. Figure 4-2 Wakeup Waveform All Rights reserved, No Spreading abroad without Permission of ZTEWelink 26 MW3650 0 Hardware Development Guide of Module Products 4.2 Hardware interface description The interfaces and peripheral circuit should be designed reasonably in the process of hardware development. The interface voltages of peripheral circuit must match with voltages of product pins., otherwise the performance may be influenced or the module cannot work normally or even be damaged. This section mainly describes related interfaces of the module including interface logic function, interface description, design example and match circuit. According to the interfaces description in this section, customers can make secondary developments about embedded system and consumer electronics. Interfaces of MW3650 module includes as following aspects.

UART interface

(U)SIM card (compatible with 1.8V/3.0V)

USB2.0 full-speed interface

External power supply

Power on/off and RESET control

I2C interface

SPI interface

ADC

Module status indicator All Rights reserved, No Spreading abroad without Permission of ZTEWelink 27 MW3650 0 Hardware Development Guide of Module Products 4.3 Ground GND is the Ground signal of this product, and needs to be well connected to the ground on system board. If the GND signal is not connected completely, the performance of module will be affected. Well ground handing is important to module performance guarantee such as guaranteeing signal integrity, improving RF performance, reducing EMI interference and heat dissipation. In module ground handing process:

1. The module ground welding panel should have full access to mainboard welding panel;

2. All GND pins must be accessed to ground panel with shortest ground wire. All GND pins should be connected together effectively using plenty of vias;

3. For RF signal, please pay attention to the resistance wire structure (micro strip line, strip line) and ensure the integrity of reference ground;

4. It is wise to surround (on both sides) the PCB transmission line such as audio and clock signal with Ground, and isolate the interference source from sensitive source;

5. Line geometry should have uniform characteristics, constant cross section, avoid meanders and abrupt curves. 4.4 Power Interface 4.4.1 V_MAIN PINS According to the definition, power supply pins of module are described as V_MAIN signal group including pin50&51. Power supply pins V_MAIN are positive poles and input signals. When design the external circuit, firstly, ensure external power supply circuit has sufficient power supply ability and the power voltage range is strictly controlled between 3.4V and 4.2V (typical value 3.8V). If the voltage is higher than the voltage range, the main chip will be damaged while if the voltage is lower than the voltage range, the working of RF circuit will be influenced or shutdown/restart phenomenon will happen. When the network signal is weak, RF transmit power and module transient current will increase and transient peak current value will reach about 2A. So when design the power supply circuit, choose DC/DC All Rights reserved, No Spreading abroad without Permission of ZTEWelink 28 MW3650 0 Hardware Development Guide of Module Products or LDO of that lager than 2A. In addition, considering that the transient current needed by high-power transmit is large under GSM model, so in the circuit design process, please add a large capability (lager than 470uF) in the output of DC/DC or LDO to avoid voltage decline abruptly. Sufficient line width of power line on system board should be guaranteed, and at the same time, the power line should form a well circumfluence with ground panel. Moreover, in the power supply circuit design process, large capacitance at kilo uF level should be added to guarantee the transient power supply ability. It is recommended that on system side DC/DC power supply is adopted and power ripple is controlled within 100mV. Table 4-2 Voltage Current Characteristic Type Minimum value Typical value Maximum value (transient) Input voltage 3.3 V 3.8 V 4.2 V As is shown in the following figure, using LDO power supply circuit as a reference, over-current capability of LDO needs to be above 3A. As the poor transient response of linear regulator, large capacitors should be placed at the input and output of LDO to avoid resetting or power off resulted from that too large voltage fluctuation in high-power transmitting process under GSM mode. The reference power supply circuit design with LDO is as shown in Figure below. Figure 4-3 LDO Power Supply As is shown in the following figure, use DC/DC switch power and large capacitors (lager than 1000uF) to ensure the normal working of RF PA (power amplifier) and sufficient transient current under GSM Burst mode. The advantage of this reference design is that it can provide well transient current under 2G weak signal environment to satisfy modules requirements, to prevent device shutdown and Ports re-enumeration as a consequence of the supply voltage drop. The over-current ability of DC/DC switch power should be larger than 3A such as ZI1153, AAT2138 and so on. The input voltage range of ZI1153 is 2.5V~5.5V and the output voltage range is 0.6V to VIN (input). The input voltage range is 2.7V~5.5V and the output voltage range is 3.3V~5.5V. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 29 MW3650 0 Hardware Development Guide of Module Products As shown in the Figure below, use DC/DC switching power supply ZI1153 as the buck chip. Place a tantalum capacitor of 330UF at the input of the chip. Place a 2200UF capacitor or place several 330UF tantalum capacitors in parallel. This circuit fully meets the module power requirements. (If the users PCB size is limited, the output of buck chip can place three more 330UF tantalum capacitors of which the total capacity is more than 1000uF) Figure 4-4 DC/DC Switching Power Supply Vin=5V Vout=3.8V 4.4.2 VREF PINS MW3650 module has 2 power output pins used to supply power for external circuit on the mainboard. The voltages of these pins and the voltages of baseband processor and storage come from the same internal voltage regulator. They output voltage only when the module is powered on. The normal output voltage is PIN5 (VREF_1V8,1.8V) and PIN4(VREF_2V8,2.85V). Users should draw current as less as possible from these pins. Generally, users are suggested that these power pins are only used for pulling up chip pins in level matching process. 4.4.3 PCB Layout Guideline of Power Supply When design the power supply of module, the layout and wiring of related components in power supply part is very important. If they are not designed appropriately, it will have effects on many aspects, such as the EMC performance , the transmission modulation spectrum, receive sensitivity and so on. The users of Modules should do as the following guidelines in the process of power supply PCB line designing:

The use of a good common ground plane is suggested. Because the power switch has strong EMC interference, place the circuit lines far away from antenna. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 30 MW3650 0 Hardware Development Guide of Module Products Considering the module power supply requirements, the PCB traces from the input connector to the power regulator IC must be wide enough to ensure no voltage drops occur when the 2A current peaks are absorbed. The recommended power wiring width is more than 100mil. The wiring of power supply should be far away from the circuit which is sensitive for noise such as microphone/earphone, RF cable and so on. The PCB wiring between module and bypass capacitor should be wide enough and as short as possible to ensure there is no significant voltage decline abruptly when the current is peak 2A. 4.5 Power-on/Power-off & Reset 4.5.1 Power On After the module been normally electrified, it is in power-off status. To turn on the module, the ON/OFF pin must be tied low for at least 3 seconds and then released. 4.5.2 Power Off To turn off the module the ON/OFF pin must be tied low for at least 3 seconds and then released. The power on/off part circuit reference design is shown in the following figure. Figure 4-5 Power On & Reseting Circuit Reference Diagram All Rights reserved, No Spreading abroad without Permission of ZTEWelink 31 MW3650 0 Hardware Development Guide of Module Products 4.5.3 Reset You can reset the module by driving the PON_RESET_N to a low level voltage for more than 100ms and then releasing. After resetting, the module will shut down first and then enter power-on status automatically.

Other advises To ensure that the data of module is well saved a, please do not cut off the module power during the module runtime. It is strongly recommended that use AT command (+ZPWROFF) to shut down the module in application. The PON_RESET_N and ON/OFF signals are sensitive. When designing a circuit on the PCB of the main board, it is recommended that the circuit length not exceed 20 mm and the circuit be kept at a distance of 2.54 mm (100 mil) at least from the PCB edge. Furthermore, you need to surround (on both sides) the signals with Ground. Otherwise, the module may be reset due to interference. 4.5.4 Power-on/Power-off Flow To guarantee the user can power on and power off stably, you can refer to the power-on sequence chart as shown in Figure 4-6 and the power-off sequence chart as shown in Figure 4-7. Table 4-3 shows the power-on and power-off time. During the process of power on the module, pay attention to the following items:

1) The power on time that the module supplies to external interfaces cannot be earlier than the module power on time. 2) Once the V_MAIN is powered on, the ON/OFF signal will be synchronized and established as the high PWL. 3) The time interval between the V_MAIN is electrified normally and ON/OFF signal is valid could not be too short. For details see T2 parameter. It is recommended not to disconnect the power supply after V_MAIN is powered off. 4) The failing edge of ON/OFF is the start of power-on time. ON/OFF should be released after being kept at low PWL for a period of time. 5) VBUS supplies power for USB PHY. It is not recommended to connect VBUS to power supply before V_MAIN. During the process of power-off, pay attention to the following items:

1) To power off by the ON/OFF signal, the T4 period needs to be designed as required. 2) After VPH_PWR and USB_VBUS are powered off, it is recommended not to disconnect the power supply. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 32 MW3650 0 Hardware Development Guide of Module Products Figure 4-6 Power-on Sequence Chart of Module T1 V_MAIN VBUS T3 ON/OFF T2 Figure 4-7 Power-off Sequence Chart of Module V_MAIN T5 VBUS ON/OFF T4 Table 4-3 Power-on/Power-off Time Parameter Description Min Typical Max Unit T1 T2 T3 T4 T5 The time from power-on issue to VBUS ready From powering on V_MAIN to ON/OFF ready The time of active low level impulse of ON/OFF pin to power on module The time of active low level impulse of ON/OFF pin to power off module The time from power-off issue to V_MAIN and VBUS off 0 1

--

--

1 0.5 1.5 3 3 2 1

--

--

--

--

second second second second second All Rights reserved, No Spreading abroad without Permission of ZTEWelink 33 MW3650 0 Hardware Development Guide of Module Products 4.6 UART Interface The module provides a series of UART interfaces. The highest speed is 230.4Kbps and the typical speed is 115.2Kbps. The external interface PWL is 1.8V CMOS PWL signal used for UART communication. The definition and interface mode of UART are shown as followed. Table 4-4 The Definition of UART Signal PIN No. Type Definition I/O Description 53 54 55 56 57 58 59 60 UART(1.8V) UART_TXD UART_RXD UART_RTS UART_CTS UART_DSR UART_DTR UART_DCD UART_RI O I O I O I O O UART Send UART Receive Send get ready Receive get ready Data equipment get ready Data terminal get ready Data carrier wave detect Ring indication NOTE:

1) When the module communicates with PC or MCU trough UART, please pay attention to the direction of TX and RX. TX and RX is named in the reference direction of module. 2) The sleep of UART is realized through UART_DTR pin. When the module needs sleep, please set this pin as high PWL while when the module needs to be waked-up, please set this pin as low PWL. 3) When there is SMS, the RI pin will generate low PWL interrupt. 4) MW3650 UART interface supports 1.8V voltage, so the external UART interface which is not 1.8V needs PWL conversion. As is shown in the following figure, audion can be used to realize the PWL conversion. The resistance is only an example in the figure. Please recount it during designing. The diode in the figure is Schottky diode (whose forward voltage drop is 0.3V). If other diodes are chosen, please choose the one whose forward voltage drop is small to ensure the PWL of RXD_1V8 is below the low PWL input threshold when the low PWL is input. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 34 MW3650 0 Hardware Development Guide of Module Products Figure 4-8 UART Interface PWL Conversion Reference Design Figure 4-9 Module Serial Port & AP Application Processor Module RXD TXD CTS RFR DTR DSR DCD RI GND TXD RXD RFR CTS DTR DSR DCD RI GND AP To catch LOG during the software debugging process, it is recommended for users to keep this interface and reserve testing points. If the module is connected with the application processor whose PWL is 1.8V, the connection way is as shown in figure 4-9. 8-line or 2-line connection way can be adopted. The PWL of module interface is 1.8V. If it does not match with the AP interface, the PWL switching circuit is suggested to be added. MW3650 module can connected with standard RS-232-C interface through chips of 232 type. If the design is related to the interconverting between TTL PWL and EIA PWL, the NLSX5014MUTAG chip is recommended to be used. For example, when 2-line UART is used, the MAX3232 chip is recommended and when 8-line UART is used, SP3238 or MAX3238 chip is recommended to design the interface. The connection way is shown in the following figure. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 35 MW3650 0 Hardware Development Guide of Module Products Figure 4-10 The Connection of UART and Standard RS-232-C Interface The module support standard 8-wire UART interfaces and transfer digital signals, please isolate them from sensitive signals to avoid influencing other analog signal and RF signal. 4.7

(U)SIM Card Interface Module baseband processor integrates the (U)SIM card interface to compliance with ISO 7816-3 standards, and supports 3.0V/1.8V (U)SIM cards. The signals on SIM card interface is as shown in Table below. Table 4-5 The Definition of USIM Card Interface PIN No. Type Definition 37 38 39 40 USIM USIM_CLK USIM_DATA USIM_RST VREG_USIM I/O O I/O O O Description USIM card clock line USIM card data line USIM card reset signal USIM 1.8/3V power supply Notes about designing SIM card:

1) Because the typical speed of (U)SIM card interface is about 3.25MHz, it is recommended to place (U)SIM card console close to the (U)SIM card interface, to prevent the wiring from being too long (the wiring is recommended not to be longer than 100mm) to influence the normal communication of (U)SIM signal. 2) The wiring of SIM card signal wire should be placed far away from RF wire and V_MAIN power supply line. 3) The GND of SIM card console wiring and the module GND wiring should be short and thick, meanwhile the electric potential of them should be the same. The line width of SIM_VDD and GND should be ensured not less All Rights reserved, No Spreading abroad without Permission of ZTEWelink 36 MW3650 0 Hardware Development Guide of Module Products than 0.5mm. The bypass circuit between VREG_USIM and SIM_GND should not be bigger than 1uF, and be placed near the SIM card console. 4) To avoid the potential interference between USIM_CLK and USIM_DATA signal, please do not place the wiring of them too near, and USIM_CLK and USIM_DATA signal need to be surrounded by Ground. USIM_RST signal also needs ground protection. Add a 0.1uF or 0.22uF capacitance of 0402 encapsulation on VREG_USIM, and cascade a 0 resistance and parallel a 33pF capacitance with USIM_CLK, USIM_DATA and USIM_RST for the convenience of matching of latter electrical performance and to avoid the interference because of too long wiring. Besides, USIM_DATA signal should be pulled up to VREG_USIM. The pull-up resistor value is about 10K to avoid the identification problem of SIM card. 5) Besides, these four signal wires should parallel TVS to avoid electrostatic discharge. The recommended reference design circuit of ESD protection of wireless module SIM card interface is shown in the following figure. 6) The wiring related to (U)SIM card need to be put together. The wiring width of VREG_USIM is related to its length. The recommended value is 10 mil wiring width. The wiring of (U)SIM card can refer the wiring of BUS. Please pay attention to the wiring protection to avoid the interference of high-speed signal and strong reference signal of clock to (U)SIM card signal. Otherwise the restart of (U)SIM card may be caused. The ESD protection components of (U)SIM card should be placed near (U)SIM card console to avoid the electrostatic interference to module. Figure 4-11 (U)SIM Card Console Circuit Reference Design All Rights reserved, No Spreading abroad without Permission of ZTEWelink 37 MW3650 0 Hardware Development Guide of Module Products 4.8 USB Interface MW3650 module has the high-speed USB2.0 interface. It is connected to the system board side by LCC interface, which is the path for communication between the processor on the system board side and module of which the pins are PIN23(USB_DM) and PIN24(USB_DP). The definition of USB pins is shown in table 4-6. Table 4-6 The Definition of USB PINS PIN NO. Type Definition 22 23 24 VBUS USB USB_DM USB_DP I/O I I/O I/O Description USB power USB data-

USB data+

Remark 5V

--

--

VBUS is the module USB power supply pin. The working current of USB is 4.75V~5.25V and typical value is 5V.This power supply can supply the module with 3.8V voltage after transition by the power supply circuit mentioned in the previous section. USB_DM/USB_DP is differential data line. During PCB wiring, it should meets the requirements of differential line and surrounded by Ground. If it is too close to antenna, to avoid the influence of antenna radiation, high-speed common mode suppression filter can be concatenated on the USB differential signal wiring circuit. USB interface needs to add TVS components to avoid damage of module components because of static electricity. The load capacitance value of TVS should be less than 3pF, to satisfy the transmission of USB2.0 high-speed signal. In the following figure, D1 is USB2.0 anti-static protective components. Meanwhile, USB_VBUS pin is vulnerable to voltage shock which can damage the pin. It is recommended to adopt appropriate OVP measure to avid the voltage higher than 5.25V. Besides, the power-off leakage current exists on USB_VBUS. It is suggested to add power switch on power supply branch circuit or cascade a resistance with the resistance value between 200k and 400k to reduce the leakage current when the module is powered off but does not cut off the power. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 38 MW3650 0 Hardware Development Guide of Module Products Figure 4-12 USB Interface Circuit Reference Design Schematic Diagram Usually, USB interface of module can be enumerated to several ports, such as AT port, DIAG port, Modem port and so on. These ports are enumerated in order during the load process. For example, during the load process of module under Linux system, if the enumeration of DIAG port is ttyUSB0, the ports maps on PC are shown in the following table. Table 4-7 The Correspondence of Port Map Module VID&PID Dial-up port AT Command Port DIAG Port Audio Port USB Modem Service Port Diagnostics Port Voice Port MW3650 VID_19D2&

Windows: 03 Windows: 02 Windows: 00 Windows: 01 PID_FFEB

/Linux: ttyUSB3

/Linux: ttyUSB2

/Linux: ttyUSB0

/Linux: ttyUSB1 USB Modem port, bearing AT commands, is mainly used for initiating data business. Service Port, bearing AT commands, is mainly used for AT command operation when MODEM port is occupied by data business. Diagnostics Port, bearing DIAG task, can be connected to the tool for catching LOG or updating to catch software LOG information or update the firmware. 4.9 Working Status Indicator Interface The SIG_LED pin is constant current output interface whose current driver capability is 20mA. It is connected with LED to indicate the working status of module. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 39 MW3650 0 Hardware Development Guide of Module Products The indicator light reference design is shown in the following figure. The luminance of LED can be regulated by the value of resistance. The indicator status of network is as defined in table below Table 4-8 Indicator Light Reference Design Schematic Diagram Table 4-9 The Description of Working Status Indicator Light Module status Indicator light status Frequency Power-on status Indicator light off Network searching status Standard flicker Free status Data business status Slow flicker Fast flicker 3Hz 1Hz 5Hz 4.10 SPI Bus Interface The SPI interface signal definition of this product is shown in the following table. Table 4-10 The Definition of SPI Interface PIN NO. Type Definition 32 33 34 35 SPI SPI_MISO_DATA SPI_MOSI_DATA SPI_CLK SPI_CS_N I/O

--

--

I/O I/O Description Main input, slave output Main output, slave input SPI interface clock signal SPI gating signal SPI interface electric features:

The SPI bus of this product is configured as the main equipment, which has three modes:

Running modebasic running mode;

Waiting mode The waiting mode of SPI is a configurable low-power mode, enabled by the byte of the control registered. In the waiting mode, if the waiting byte is cleared, SPI works under the similar running mode. However, if SPI waits for the position byte, SPI clock stops and enters the low-power status. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 40 MW3650 0 Hardware Development Guide of Module Products Stop modeUnder the stop mode, SPI is not available, so the power consumption is reduced. If SPI is configured as the master equipment, any transmission process will be stopped, but it can enter the running mode when the waiting mode stops. 4.11 I2C Bus I2C is the two-wire bus for the communication between ICs, which supports any IC process (NMOS, CMOS, dual-polarity). The two signal wires, serial data (I2C_SDA) and serial clock (I2C_SCL), can transmit information between the connected equipment. Each equipment is identified by the unique address (such as the micro controller, storage, LCD driver or keyboard interface). Due to the different functions of the equipment, it can be used as both the sender and the receiver. The I2C interface has the following electric features:

1) The two-wire bus is used for the communication between chips. 2) It supports any external equipment of any manufacturing technology (1.8V). 3) It supports the external functions, such as the image sensor, micro controller, LCD driver and keyboard interface. The I2C interface has two working modes with different transmission ratios: standard mode with a speed as high as 100kbps; high-speed mode with a speed as high as 400kbps. Figure 4-11 is the I2C reference circuit design diagram. Table 4-11 I2C Reference Circuit Design All Rights reserved, No Spreading abroad without Permission of ZTEWelink 41 MW3650 0 Hardware Development Guide of Module Products 4.12 User Interface AT commands are mainly used for communication between users and the module. AT commands comply with ITU-T V.250, 3GPP 27.007 and 3GPP 27.005 standards. Moreover, the module also supports ZETWelink expanding AT commands. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 42 MW3650 0 Hardware Development Guide of Module Products 5 Antenna 5.1 Preliminary Antenna Evaluation The antenna is a sensitive device and its performance is greatly affected by external environments. The radiation performance of the antenna is affected by the mainboard dimensions, antenna position, occupied space size of the antenna, and the grounding of surrounding components of the antenna. Besides, the fixed assembly of the antenna, the wiring of RF cables on the antenna, and the fixed position of the antenna all are related to the problem whether the antenna exists the interference problem with structure. Thus, during the preliminary design phase of an antenna, it is critical that antenna engineers, RF engineers, baseband engineers, structure engineers, and ID engineers work together to make estimation for both 2D and 3D design. 5.2 Antenna Design Guidance Well shielding measure should be added between external antenna and RF PAD of module, and external cables should be far away from all interference source, especially high-speed digital signal, DC/DC power and so on. According to mobile equipment standard, the standing-wave ratio of antenna the module uses should be between 1.1 and 1.5. Input resistance is 50. Under different environments, the requirements of antenna gain are different. Usually, antenna performance is better if intraband gain is larger and out-of-band gain is smaller. When using the multi-ports antenna, the isolation between the ports should be larger than 30dB. For example, the isolations between the two different polarization ports on polarization antenna, the two different frequency ports on dual-frequency antenna and the four ports on dual-frequency dual-polarization antenna should be larger than 30dB. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 43 MW3650 0 Hardware Development Guide of Module Products Figure 5-1 Translation Circuit Diagram Microstrip line or stripline with a natural impedance of 50 ohm Dual-L matching network Microstrip line or stripline with a natural impedance of 50 ohm Anten na RF interface on the antenna RF cable and RF interface on the mainboard RF coaxial cable of the antenna RF interface on the module PIN62 is antenna pin. The following items should be noticed when this pin is used an antenna feed pin. 1) The feed cable connected with PIN 62 is microstrip line or strip line with resistance value of 50. Near the module, -shaped or inverted-F-shaped matching network should be added for latter tuning. 2) The RF wiring should be kept certain distance with GND. Usually the distance is 3 times the line width of RF wiring. 3) Do not pile the interference sources near the RF wiring or RF ports, such as DCDC, WIFI module and so on. 5.3 Suggested Antenna Location Mainboard area has serious interference. The experiments result shows that the module performance will be poor If the module is placed in these interference regions. During the laptop design, it is better to separate the module from the mainboard PCB, instead of installing the module on the mainboard. If they cannot be separated, the module should be far from modules and components that might generate EMI, such as chip and memory, power interface, and data cable interface. For Internet laptops products, the ideal position of antennas is on the top left corner or top right corner of the LCD, which is relatively far from the mainboard, so the electromagnetic interference is relatively small. Besides, because it is far from human bodies, it is easy to satisfy SAR indexes. The other choice is on the left or right of LCD. Other products such as router, e-book and so on should be evaluated specifically according to the features of product itself. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 44 MW3650 0 Hardware Development Guide of Module Products Because different antenna manufacturers may adopt different antenna modes and different terminal products have different external dimension and different requirements for antenna performance, the reserved spaces as well as antenna dimension and location are all different. Take the 3G internet laptops as an example, the recommended antenna space dimension is larger than 7mm*10mm*100mm, and it is recommended to place the antenna at the top of LCD screen. 5.4 RF PCB wire guidelines The RF wiring of antenna should be kept as short as possible. It is suggested to choose thicker RF cables considering the transmission consumption. Meanwhile, RF cables should be far away from modules and components that might generate EMI, such as chip and memory, power interface, and data cable interface. The RF wiring connecting the antenna and 3G module should not be right angle, squeezing and abraded. Keep, if possible, at least one layer of the PCB used only for the Ground plane; If possible, use this layer as reference Ground plane for the transmission line;

5.5 EMC Requirements Electronic communications have more EMC requirements than non-communication products. It is very important that baseband engineer, RF engineer and antenna engineer must fully communicate during the design process of circuit and wiring to reduce the electromagnetic interference of produces. The following items are common problems and solutions that can be referred during the product design process. 1) During the product design, it is better to separate the module from the mainboard PCB, instead of installing the module on the ground of the mainboard. If they cannot be separated, the module should be far from modules and components that might generate EMI, such as chip and memory, power interface, and data cable interface. 2) Because the mainboard of PAD, CPE, and Internet laptops does not have a shielding cover, as that of mobile terminals, to shield most circuits to avoid overflow of electromagnetic interference, you can spray conductive paint on the surface on non-antenna areas within the structural components above and below the mainboard, and the conductive paint should be connected to the ground on the mainboard by several points to shield electromagnetic interference. 3) Besides, data cables of the LCD and the camera might introduce interference signals, which affect the receiving performance of the antenna. Thus, it is necessary to wrap conductive cloth around the two data cables and connected them to the ground. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 45 MW3650 0 Hardware Development Guide of Module Products 4) RF cables of the antenna should be far from modules and components that might generate EMI, such as chip and memory, power interface, and data cable interface. The wiring of RF cables should be close to the ground of the mainboard. 5.6 Index Requirement of Antenna Module supported electronic communications pay more and more attention to collect radiation performance test. At present there are two methods to investigate the radiation performance: one method is investigating the radiation performance of antenna which is a traditional antenna test method, i.e. passive test; the other method is testing the radiation power and receiving sensitivity in a specific microwave darkroom, i.e. active test. The index requirement of antenna involves passive index requirement and active index requirement. Passive indexes include S11, antenna efficiency, antenna gain, antenna pattern and so on which can used as parameters weighing the performance of antenna itself. Active indexes usually mean OTA indexes, including TPR (all-round radiation power), TIS (all-round receiving sensitivity), radiation pattern and so on which are important indexes weighing the whole device (including antenna, module, circuit main board) radiation performance. 5.6.1 Passive Index of Antenna Different products have different requirements about antenna performance. The following is the passive reference index about PAD products while the antenna radiation performance is weighed by the active index. The passive index requirements are only for the main antenna as is shown in table below. Table 5-1 The Passive Index Reference of Main Antenna about PAD product Frequency band 824-960MHz 1710-2170MHz VSWR Maximum gain Average gain Efficiency

<3.5:1

>0dBi

>-3.5dBi

>40%

<3.5:1

>0dBi

>-3.5dBi

>40%

It is recommended that the passive index reference of diversity antenna should be decided by the requirements of its performance. If it is required that the performance of diversity antenna is the same as the performance of main antenna, the requirement about passive index of diversity antenna is shown in table above. If it is required that the performance of diversity antenna reach half of performance of main antenna, see table below for passive index. Table 5-2 The Passive Index Reference of Diversity Antenna about PAD product Frequency band 824-960MHz 1710-2170MHz All Rights reserved, No Spreading abroad without Permission of ZTEWelink 46 MW3650 0 Hardware Development Guide of Module Products

<3.5:1

>-3dBi

>-6.5dBi

>20%

<3.5:1

>-3dBi

>-6.5dBi

>20%

VSWR Maximum gain Average gain Efficiency

NOTE:

MW3650 module does not support diversity reception. 5.6.2 Active Index of Antenna Active index is an important index weighing the radiation performance of whole device (including antenna, module and circuit main board), so the active index decides the final radiation performance of product. Because different products have different active index and different operators have different requirements about active index, it is suggested that antenna engineer, RF engineer, baseband engineer, structure engineer and ID engineer evaluate the performance the whole device can achieve according to the requirements customer provides about the product performance in the beginning of a project to decide the active index. For mobile terminal product, there is no international general standard. The standards are all customized according to the requirements of operator. Table 5-4 is the active index provided by our company for mobile terminal products for reference. Table 5-3 Recommended Product OTA Index Requirement Mode Frequency band TRP(dBm) Free space TIS(dBm) Free space GSM WCDMA GSM850MHz GSM900MHz GSM1800MHz GSM1900MHz Band I Band II Band V Band VIII 28 28 26 26 19 19 19 19

-104

-104

-102

-102

-106

-104.5

-104.5

-104.5 The active index reference of diversity antenna should be decided by the performance of diversity antenna. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 47 MW3650 0 Hardware Development Guide of Module Products 5.6.3 OTA Test method of Whole Machine Antenna Refer to the OTA test method of corresponding products in CTIA. Figure 5-6 is the structure of OTA test system in CTIA. This system mainly consists of darkroom, high-precision location system and its controller, RF test instrument and PC with automatic test program. The main RF instruments involve integrated testing instrument, frequency spectrograph and network analyzer. The frequency spectrograph, swivel table controller and PC with automatic test program communicate with each other through GPIB interface. Figure 5-2 OTA Test System All Rights reserved, No Spreading abroad without Permission of ZTEWelink 48 MW3650 0 Hardware Development Guide of Module Products 6 Electric Feature This section mainly introduces the electric features of the module, including module interface PWL, power dissipation, reliability and so on. 6.1 Interface PWL See table 6-1 for the main outward interface PWL of the module. Table 6-1 Main Out ward Interface PWL of Module Interface PWL Min Typical Max UART UIM 0 1 0 1

--

0 0.1*V_UART 0.9*V_UART V_UART

--

--

0 0.1*VREG_USIM 0.9*VREG_USIM VREG_USIM

--

V_UART is 1.8V, VREG_USIM is 1.8V or 3V. Please design according to the CMOS interface PWL. 6.2 Power Supply The input voltage range of MODULE is DC 3.4V~4.2V, and the typical value is 3.8V as shown in Table6-2. Table 6-2 Input Voltage Parameter Min Typical Max Input voltage 3.3V 3.8V 4.2V 6.3 Working Current The working current range of module is as shown in Table 6-3. The Sleep mode indicates the power consumption of the module in standby and sleep mode. The table also provides the working current range under GSM and WCDMA mode when there is data service. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 49 MW3650 0 Hardware Development Guide of Module Products Table 6-3 The Current Consumption under Sleep Mode Mode Frequency Band Test value (mA) Remark WCDMA GSM Band I (IMT2100) Band II (PCS1900) BandV(850) BandVIII(900) GSM1900 GSM1800 GSM900 GSM850

<5

<5

<5

<5

<5

<5

<5

<5 Sleep mode Note:USB bus is fully suspended under this mode. In this mode, the module can also accept SM from the network. The power consumption is decreased to the lowest level. The above test value is the average current acquired under the maximum transmission power. Under different environments, the testing results might be slightly different. Take the actual situation as the reference. Table 6-4 The Working Current of MODULE Mode Frequency Band Test value (mA) Remark UMTS GSM/GPRS Band I (IMT2100) 540 Band II (PCS1900) 530 BandV(850) BandVIII(900) GSM1900 GSM1800 GSM900 GSM850 389 537 226 169 239 239 The module in state of working. The module in state of working. Note: The above test value is the average current acquired under the maximum transmission power. Under different environments, the testing results might be slightly different. Take the actual situation as the reference. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 50 MW3650 0 Hardware Development Guide of Module Products 7 Technical Index of Radio Frequency Test Environment:

Test instrument: Agilent 8960 Power supply: Agilent 66319D RF cable length: About 15 cm WCDMA 850 MHz/900 MHz compensation: 0.6dB WCDMA 2100 MHz/1900 MHz compensation: 0.8dB

NOTE:

The compensation value is set by the frequency characteristic of corresponding RF cable. The compensation mode is related to the equipment. 7.1 Index of RF under UMTS Mode The RF index should be tested strictly in accordance with the related testing specifications of 3GPP. The RF indexes of UMTS2100/1900/850/900 should satisfy the requirements of 3GPP TS 34.121 protocol. 7.1.1 Maximum Transmission Power Maximum transmission power is another very important index to weigh the module performance. It is the maximum transmission power the module can transmit tested at the antenna port. Under the normal testing environment, the test value and reference value of the maximum transmission power of UMTS2100/1900/850/900 are shown in the table 7-1. Table 7-1 Maximum Transmission Power Operating Band Level 3GPP Protocol Claim Test value UMTS850 UMTS900 UMTS1900 Class 3 Class 3 Class 3

+24dBm +1/-3dBm

+24dBm +1/-3dBm

+24dBm +1/-3dBm 23.04 23.04 22.89 All Rights reserved, No Spreading abroad without Permission of ZTEWelink 51 MW3650 0 Hardware Development Guide of Module Products UMTS2100 Class 3

+24dBm +1/-3dBm 22.45 7.1.2 Receiving Sensibility The receiving sensitivity is a key parameter that indicates the weakest signal strength the module can receive and work well with it. At the same time the BER (Bit Error Rate) must meet the 3GPP TS 34.121protocol requirements in case of the minimum signal. The test value of UMTS2100/900 receiving sensibility is shown in the Table 7-2. Table 7-2 Reference of Receiving Sensitivity Operating Band Unit 3GPP Protocol Claim Test value UMTS850 UMTS900 dBm/3.84 MHz

-103.7dBm dBm/3.84 MHz

-103.7dBm UMTS1900 dBm/3.84 MHz

-104.7dBm UMTS2100 dBm/3.84 MHz

-106.7dBm

-109.9

-109.2

-110.3

-109.9 7.1.3 Spurious Emission Index The spurious emission is the signals the transmitter transmits beyond the frequency band the spectrum emission mask describes. The spurious emission will interfere other wireless communication systems. The aims of meeting the spurious emission requirements are improving the electromagnetic compatibility performance of the system for better coexisting of other systems and ensuring the normal running of the system itself. The spurious emission index of UMTS2100/1900/850(900) should comply with the requirements in 3GPP TS 34.121 protocol, as illustrated below. And the test result of module in UMTS mode meets the requirement in Table 7-3. Table 7-3 Spurious Emission Index Frequency Band Resolution Bandwidth Minimum Requirement 9 kHz f < 150 kHz 150 kHz f < 30 MHz 30 MHz f < 1000 MHz 1 GHz f < 12.75 GHz 1 kHz 10 kHz 100 kHz 1 MHz

-36 dBm

-36 dBm

-36 dBm

-30 dBm 7.2 Index of RF under GPRS/GSM/EDGE Mode The RF indexes of GSM/GPRS/EDGE 900/1800 should satisfy the requirements of 3GPP TS 05.05 protocol. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 52 MW3650 0 Hardware Development Guide of Module Products 7.2.1 Maximum Transmission Power Maximum transmission power is another very important index to weigh the module performance. It is the maximum transmission power the module can transmit tested at the antenna port. Under the normal testing environment, the test value and reference value of the maximum transmission power of GSM850/900/1800/1900 (GMSK/8PSK) are shown in the table 7-4. Table 7-4 Maximum Transmission Power of GSM850/900/1800/1900 (GMSK/8PSK) Frequency Band Power Level 3GPP Protocol Claim Test value GSM850 GSM900 GSM1800 GSM1900 Class 4 Class 4 Class 1 Class 1

+33dBm2dBm

+33dBm2dBm

+30dBm 2dBm

+30dBm 2dBm 32.61 dBm 32.9 dBm 30.08dBm 29.55 dBm 7.2.2 Receiving Sensibility The receiving sensitivity is a key parameter that indicates the weakest signal strength the module can receive and work well with it. At the same time the BER (Bit Error Rate) must meet the 3GPP TS 34.121protocol requirements in case of the minimum signal. The test value of GSM850/900/1800/1900 (GMSK/8PSK) receiving sensibility is shown in the Table 7-5. Table 7-5 Receiving Sensitivity Frequency Band Unit 3GPP Protocol Claim Test value GSM850 GSM900 GSM1800 GSM1900 dBm/3.84 MHz

-102dBm dBm/3.84 MHz

-102dBm dBm/3.84 MHz

-102dBm dBm/3.84 MHz

-102dBm

-110.3dBm

-110.2 dBm

-108.3dBm

-107.3 dBm 7.2.3 Spurious Emission Index The spurious emission is the signals the transmitter transmits beyond the frequency band the spectrum emission mask describes. The spurious emission will interfere other wireless communication systems. The aims of meeting the spurious emission requirements are improving the electromagnetic compatibility performance of the system for better coexisting of other systems and ensuring the normal running of the system itself. The spurious emission index of GSM850/900/1800/1900 (GMSK/8PSK) should comply with the requirements in 3GPP TS 34.121 protocol. And the test result of module meets the requirement in following. The test power should be less than -36dBM tested under the frequency band between 9kHz and 1GHz. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 53 MW3650 0 Hardware Development Guide of Module Products The test power should be less than -30dBm tested under the frequency between 1GHz and 12.75GHz. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 54 MW3650 0 Hardware Development Guide of Module Products 8 Related Test & Test Standard 8.1 Testing Reference The related tests of MODULE comply with the IEC standard, including the equipment running under high/low temperature, storage under high/low temperature, temperature shock and EMC. Table 8-1 is the list of testing standard, which includes the related testing standards for MODULE. Table 8-1 Testing Standard Test Standard Document Reference IEC6006826 Environmental testing-Part2.6:Test FC: Sinusoidal Vibration IEC60068234 Basic environment testing procedures part2. IEC60068264 Environmental testing-part2-64: Test FH: vibration broadband random and guidance. IEC60068214 Environmental testing-part 2-14: Test N:change of temperature. IEC60068229 Basic environmental testing procedures-part2: Test EB and guidance. IEC6006822 Environmental testing-part2-2:Test B:dry heat IEC6006821 Environment testing-part2-1: Test A: cold. GB/T 15844.2 MS telecommunication RF wireless phone-set environment requirement &

experimental method part 4: Strict level of experimental condition Basic environment experiment of electronic products-Part2:Experiment GB/T 2423.11 method Try Fd: Broad frequency band random vibration (General requirement) TIA/EIA 603 3.3.5 TIA Standard-part3-5:Shock Stability

NOTE:

1. IECL International Electro technical Commission;

2. GB/T: Recommended national standard. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 55 MW3650 0 Hardware Development Guide of Module Products 8.2 Description of Testing Environment The working temperature range of MODULE is divided into the normal working temperature range and the extreme working temperature range. Under the normal working temperature range, the testing result of RF complies with the requirements of 3GPP specifications, and its function is normal. Under the extreme temperature range, the RF index basically complies with the 3GPP specifications, and the quality of data communication is affected to a certain extent, but its normal function is not affected. MODULE has passed the EMC test. Table 8-2 is the requirement for the testing environment, and Table 8-3 lists out the instruments and devices that might be used during the test. Table 8-2 Testing Environment Working Condition Min Temperature Max Temperature Remark Normal working condition

-30C Extreme condition Storage working

-40C

-40C

+75C

+85C

+85C All the indexes are good. Some indexes become poorer. Storage environment of module Table 8-3 Testing Instrument & Device Testing Item Instrument & Device RF test Comprehensive testing device RF cable Tower antenna Panel antenna High/Low-temperature High/Low-temperature experimental box running & storage test Temperature shock test Temperature shock experimental box Vibration test Vibration console 8.3 Reliability Testing Environment The reliability test includes the vibration test, high/low-temperature running, high/low-temperature storage and temperature shock experiment test. Refer to Table 8-4 for the specific parameters. Table 8-4 Reliability Features Test Item Test Condition Test Standard Random vibration Frequency range: 5-20Hz, PSD:1.0m2/s3 IEC 68-2-6 Frequency range: 20-200Hz, -3dB/oct 3 axis, 1 hour for each axis All Rights reserved, No Spreading abroad without Permission of ZTEWelink 56 MW3650 0 Hardware Development Guide of Module Products Temperature shock Low temperature: -40C 2C IEC 68-2-14 Na High temperature: +90C 2C Temperature changing period: less than 30s Test duration: 2 hours Cycle: 10 High-temperature running Normal high temperature: 75 C ZTE standard Extreme high temperature: 80C Duration: 4 hours Low-temperature running Normal low temperature: -30C ZTE standard Extreme low temperature: -40C Duration: 4 hours High temperature & high Temperature: +60C ZTE standard humidity Humidity: 95%

Duration: 48 hours High temperature storage Temperature: 85C IEC 68-2-1 Ab Duration: 24 hours Low temperature storage Temperature: -40C IEC 68-2-2 Bb Duration: 24 hours 8.4 Reliability Testing Result Table 8-5 The Temperature Testing Result Under Windless Condition Mode Environment temperature Voltage Transmit power Duration Testing result GPRS Class 10

+25C EDGE Class 12

+25C WCDMA

+25C

(3.810%)V

(3.810%)V

(3.810%)V Max Max Max 1hour 1 hour 1 hour Pass Pass Pass Table 8-6 The High/low Temperature Running and Storage Testing Result Test Item Test Condition &

Standard Test Content Test result Random vibration Temperature shock Refer to Table 8-4 RF test & function test Refer to Table 8-4 RF test & function test Low temperature running Refer to Table 8-4 RF test & function test High temperature running Refer to Table 8-4 RF test & function test Pass Pass Pass Pass Extreme low temperature running Extreme high temperature running Refer to Table 8-4 RF test & function test Pass Refer to Table 8-4 RF test & function test Pass Low temperature storage Refer to Table 8-4 RF test & function test High temperature storage Refer to Table 8-4 RF test & function test Pass Pass All Rights reserved, No Spreading abroad without Permission of ZTEWelink 57 MW3650 0 Hardware Development Guide of Module Products 8.5 ESD Characteristic Module is sensitive to ESD in the process of storage, transporting and assembling. Especially, the module is mounted on the users mother board, The ESD components should be placed beside the connectors which human body might touch, such as USIM card holder, audio jacks, switches and keys, etc. The measured ESD values of module at the normal temperature are shown as the following table. Table 8-7 Module ESD Features Interface Test program Test requirements Antenna Interface Shielding case Air discharge Contact discharge Air discharge Contact discharge 8 kV 6kV 8 kV 6kV All Rights reserved, No Spreading abroad without Permission of ZTEWelink 58 MW3650 0 Hardware Development Guide of Module Products 9 SMT Process and Baking Guide Now there are more and more products in our company. Customers may meet a lot of welding problems. So, we provide this SMT process and baking guide particularly for customers to ensure the first pass yield of the module on customer side. 9.1 Storage Requirements Storage conditions: temperature<40, relative humidity<90% (RH), 12 months weldability guaranteed under this circumstances of excellent sealing package. The Moisture sensitivity level for all modules is level 3 (Conforming to IPC/JEDEC J-STD-020). After opening the package, mount within 168 hours under the environment conditions of temperature<30, relative humidity<60% (RH); if it doesnt meet the above requirements, perform the baking process. See the baking parameters in Table below:

Table 9-1 Baking parameters Temperature Baking conditions Baking time Remarks 1255 455 Moisture60%RH 8 hours The accumulated baking time must be less than 96 hours Moisture5%RH 192 hours The products transportation, storage and processing must conform to IPC/JEDEC J-STD-033. When in the process of PAD designing of module, refer to IPC-SM-782A and following instructions. 9.2 Modules Position Requirements on Main board It is recommended that the thickness of green oil at the modules position on main board should be less than 0.02mm. Do not cover with white oil or cover white oil on the green oil layer to avoid excessive thickness. As the excessive thickness may cause the module cannot be effective contact with the solder paste thus affecting the quality of welding. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 59 MW3650 0 Hardware Development Guide of Module Products Figure 9-1 Green oil and white oil at modules position on main board The white oil need be removed

(The figure is just for reference; it doesnt represent the actual module encapsulation) In addition, do not lay out other components within 2mm around the modules position on main board to ensure the maintenance of the module. 9.3 Module Planeness Standard The modules planeness is required to be 0.15mm. Measurement method: put the module on the marble plane, use the feeler gage to measure the gap width at the position of maximum warp, and do not exert force on the module during the measurement. 9.3.1 Process Routing Selection The modules are manufactured with the lead-free process and meet the ROHS requirements, therefore its recommended to follow the lead-free manufacturing process upon the selection of process routing for module board and main board. 9.3.2 Solder Paste Selection The solder pastes with metal particle TYPE3 and TYPE4 can fulfill the welding requirements. It is accordingly recommended to use the no-clean solder paste. If the solder paste which needs cleaning is used, we cannot guarantee the components on the module board could withstand the washing of the cleaning solvents. This might cause the functional problems of such components and affect the appearance of the module. During the printing process, make sure the solder pastes thickness at the position of modules PAD is within 0.18mm -0.20mm. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 60 MW3650 0 Hardware Development Guide of Module Products 9.3.3 Design of module PADs steel mesh opening on main board The thickness of the steel mesh on main board is selected according to the encapsulation type of components on the main board. Pay attention to the following requirements:

1) Make sure to design the module PAD on main board according to the third item as below. 2) The thickness of steel mesh is 0.15mm or 0.18mm, but the thickness at the position of module pad can be increased to 0.18~0.20mm or the thickness of steel mesh is directly 0.18mm~0.20mm on main board. 3) Requirements on the thickness of solder paste: control the thickness between 0.15mm and 0.18mm. 4) See the LCC module PADs steel mesh opening in the following table:

Table 9-2 LCC module PADs steel mesh opening Module PAD GAP (G)=Center Distance (e) PAD width (X) Steel mesh opening G0.5mm G0.5mm Drill holes at 100%

scale in the direction of width;

extend 0.3mm outward in the direction of length Contract 0.05~0.1mm in the direction of width;

Contract 0.05~0.1mm inward in the direction of length, extend 0.5mm outward in the direction of length. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 61 MW3650 0 Hardware Development Guide of Module Products Figure 9-2 Module Boards Steel Mesh Diagram 0.1mm 0.1mm Steel mesh opening Module PAD on PCB 0.5mm 0.1mm 9.3.4 Module Boards SMT process 1) SMT Pallets:

The pallets, which are suitable for SMT, have been made for most ZTE modules. If the module has provided the pallets itself and meets the SMT requirements, customers can directly use it for module SMT. Figure 9-3 Material Module Pallet

(The figure is just for reference; it doesnt represent the actual Material Module Pallet) Otherwise, customers need make a loading tool similar to the pallet. Customers can take out the module from the packaging box, put them into the pallet according to the sequence and direction, and then start SMT. 2) Mounting Pressure:

All Rights reserved, No Spreading abroad without Permission of ZTEWelink 62 MW3650 0 Hardware Development Guide of Module Products In order to ensure a good contact between the module and the solder paste on main board, the pressure of placing the module board on main board should be 2-5N according to our experiences. Different modules have different numbers of pads, therefore the pressure selected are different. Customers can select proper pressure based on their own situations to suppress the module paste as little as possible, in order to avoid the surface tension of the solder paste melts too much to drag the module during reflow. 9.3.5 Module Soldering Reflow Curve Module soldering furnace temperature curve is:

Peak value: 245+0/-5 217: 3060S 150200 : 60 120S Temperature rise slope: <3 /S Temperature drop rate: 24 /S Figure 9-4 Module Furnace Temperature Curve Diagram All Rights reserved, No Spreading abroad without Permission of ZTEWelink 63 MW3650 0 Hardware Development Guide of Module Products Note: The test board of furnace temperature must be the main board with the module board mounted on, and there must be testing points at the position of module board. 9.3.6 Reflow method If the main board used by customers is a double-sided board, it is recommended to mount the module board at the second time. In addition, it is preferable for the main board to reflow on the mesh belt when mounting at the first time and the second time. If such failure is caused by any special reason, the fixture should be also used to make such main board reflow on the track so as to avoid the deformation of PCB during the reflow process. 9.3.7 Maintenance of defects If poor welding occurs to the module board and main board, e.g., pseudo soldering of the module board and main board, the welder can directly use the soldering iron to repair welding according to the factorys normal welding parameters. 9.4 Modules Baking Requirements The module must be baked prior to the second reflow. 9.4.1 Modules Baking Environment The operators must wear dust-free finger cots and anti-static wrist strap under the lead-free and good static-resistant environment. Refer to the following environment requirements:

The products transportation, storage and processing must conform to IPC/JEDEC J-STD-033. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 64 MW3650 0 Hardware Development Guide of Module Products 9.4.2 Baking device and operation procedure Baking device: any oven where the temperature can rise up to 125C or above. Precautions regarding baking: during the baking process, the modules should be put in the high-temperature resistant pallet flatly and slightly to avoid the collisions and frictions between the modules. During the baking process, do not overlay the modules directly because it might cause damage to the modules chipset. 9.4.3 Module Baking Conditions See the baking parameters in Table 9-1. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 65 MW3650 0 Hardware Development Guide of Module Products 10 Safety Warnings and Notes During the process of the module secondary development, use and repair, all the safety warnings and notes in this section should be followed. The module integrator must pass the following safety information to users and operators or integrate the information into product operating manual:

When RF devices including the module are used, the electronic devices whose shielding performance is not good may be interfered. Please keep far away from ordinary telephones, televisions, radios and places of office automatic, to avoid interaction with the module.

Please consult the product manufacturer before the devices containing the module is used beside medical equipment such as hearing-aid, cochlear implant and heart pacemaker.

Please do not use the devices containing the module in the environment which has potential explosion hazard such as oil depot and chemical plant and which has special requirements such as hospital and airport.

Please do not expose the module to the strong sunshine to avoid being excessive heated and damaged.

The module does not have waterproof performance, so please avoid liquid entering the module. Please do not use it in the high humidity environment such as the bathroom to avoid being damaged.

Non-professionals please do not detach the module to avoid people and devices been injured or damaged.

When cleaning the module, please shut down it first and use clean antistatic fabric. Users have responsibility to follow the relevant regulations and specific operating environment regulations about wireless communication module and equipment. Our company is not responsible for the relevant loss since the customer do not follow the rules. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 66 MW3650 0 Hardware Development Guide of Module Products 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. FCC Caution:

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. Radiation Exposure Statement:

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body. This device is intended only for OEM integrators under the following conditions:

1) The antenna must be installed such that 20 cm is maintained between the antenna and users, and the maximum antenna gain allowed for use with this device is 1.6dBi. 2) The transmitter module may not be co-located with any other transmitter or antenna. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 67 MW3650 0 Hardware Development Guide of Module Products 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 IMPORTANT NOTE: In the event that these conditions can not be met (for example certain laptop configurations or co-location with another transmitter), then the FCC authorization is no longer considered valid and the FCC ID can not 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 authorization. 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 FCC ID:SRQ-MW3650. The grantee's FCC ID can be used only when all FCC compliance requirements are met. 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. All Rights reserved, No Spreading abroad without Permission of ZTEWelink 68

Model:MW3650 WCDMA Module PID:V1B IMEI: S578900040000000 S/N: D0250000400000 FCC IDSRQ-MW3650 ZTE CORPORATION MADE IN CHINA Size: 27.5x27.5mm

RF_734_02 04 April 16 Modular Approval Request FCC (KDB 996369 D01 & Part 15.212) FCC ID: SRQ-MW3650 Items to be covered by Single modular transmitters. 1. The modular transmitter must have its own RF shielding. 2. The modular transmitter must have buffered modulation/data inputs (if such inputs are provided) to ensure that the module will comply with Part 15 requirements under conditions of excessive data rates or over-modulation. 3. The modular transmitter must have its own power supply regulation. 4. The modular transmitter must comply with the antenna requirements of Section 15.203 and 15.204(b)(c). 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). 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. 6. The modular transmitter must be equipped with either a permanently affixed label or must be capable of electronically displaying its FCC identification number in accordance with 15.212 (a)(1)(vi)(A) / (B). 8. there are very strict operational and 7. The modular transmitter must comply with any specific rule or operating requirements applicable to the transmitter and the manufacturer must provide adequate instructions along with the module to explain any such requirements. A copy of these instructions must be included in the application for equipment authorization. For example, 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. The modular transmitter must comply with any applicable RF exposure requirements. For example, FCC Rules in Sections 1.1310, 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. 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. Answer from applicant The radio portion of this module has been shielded, Buffered data inputs stage has been integrated in chip QSC6270 The part number of the power regulator is QSC6270 The requirements of antenna connector and spurious emission have been fulfilled, please refer to the Test Report exhibition. Please refer to the Setup Photo exhibition for the stand-alone test configuration. Yes The required FCC rule has been fulfilled and all the instructions for maintaining compliance have been clearly stated in the User Manual. Please refer exhibition RF Exposure for the compliance of MPE RF exposure rule. Items to be covered by Split modular transmitters. 1. The modular transmitter must comply with all requirements of a single modular transmitter except for items (1) & (5) of the above single modular approval requirements. Answer from applicant RF_734_02 04 April 16 2. Only the radio front end must be shielded. The physical crystal and tuning capacitors may be located external to the shielded radio elements. The interface between the split sections of the modular system must be digital with a minimum signalling amplitude of 150 mV peak-to-peak. 3. Control information and other data may be exchanged between the transmitter control elements and radio front end. 4. The sections of a split modular transmitter must be tested installed in a host device(s) similar to that which is representative of the platform(s) intended for use. 5. Manufacturers must ensure that only transmitter control elements and radio front end components that have been approved together are capable of operating together. The transmitter module must not operate unless it has verified that the installed transmitter control elements and radio front end have been authorized together. Manufacturers may use means including, but not limited to, coding in hardware and electronic signatures in software to meet these requirements, and must describe the methods in their application for equipment authorization. Note: A limited modular approval (LMA) may be granted for single or split modular transmitters that comply partially with the requirements above. Name and surname of applicant (or authorized representative):

Daniel Lee Vice President Date: Sep. 22, 2016 Signature: ___________________________

ZTE Corporation ZTE Plaza, Keji Road South, Hi-Tech, Industrial Park, Nanshan District, Shenzhen, Guangdong, P.R.China Power of Attorney Date: September 21, 2016 To whom it may concern, Please be notified that I, Min Zhang, have designated Daniel Lee of Bureau Veritas Consumer Products Services (H.K.) Ltd., Taoyuan Branch (BV CPS Taoyuan Branch) of Taiwan as the person being responsible for this project and to sign the form 731 and other documentation. Any and all acts carried out by Daniel Lee of Bureau Veritas Consumer Products Services (H.K.) Ltd., Taoyuan Branch (BV CPS Taoyuan Branch) of Taiwan on the matters relating to all processes required in the FCC approval and any communication needed with the national authority, shall have the same legal authority as acts on our own behalf. As defined in 47 CFR Ch. 1.U.S.C.862, we further certify that neither the applicant nor any party to this application is subject to a denial to Federal benefits, including FCC benefits, pursuant to section 5301 of the Anti-Drug Abuse Act. This authorization is limited to the product of as following:

FCC ID: SRQ-MW3650 If you have any acknowledgement and response, please send it to Daniel Lee of Bureau Veritas Consumer Products Services (H.K.) Ltd., Taoyuan Branch (BV CPS Taoyuan Branch) of Taiwan directly. Should you have any question or comment regarding this matter, please have my best attention. Sincerely yours, Min Zhang / Certification Manager ZTE Corporation Tel: +86-21-68897541 Fax: +86-21-50801070 E-mail: zhang.min13@zte.com.cn

ZTE Corporation ZTE Plaza, Keji Road South, Hi-Tech, Industrial Park, Nanshan District, Shenzhen, Guangdong, P.R.China Date: September 21, 2016 Federal Communications Commission 7435 Oakland Mills Road - Gate A Columbia, Maryland 21046 Schematic Diagram Block Diagram Parts List Tune-up Procedure Operational Description Subject: Request for Confidentiality FCC ID: SRQ-MW3650 To Whom It May Concern, Pursuant to the provisions of Sections 0.457 and 0.459 of Commissions rules (47CFR0.457, 0.459), we are requesting the Commission to withhold the following attachments as confidential document from public disclosure indefinitely. Above mentioned document contains detailed system and equipment description are considered as proprietary information in operation of the equipment. The public disclosure of above documents might be harmful to our company and would give competitor an unfair advantage in the market. In additional to above mentioned documents, pursuant to Public Notice DA 04-1705 of the Commission s policy, in order to comply with the marketing regulations in 47 CFT 2.803 and the importation rules in 47 CFR 2.1204, while ensuring that business sensitive information remains confidential until the actual marketing of newly authorized devices. We are requesting the commission to grant short-term confidentiality request on the following attachments until 180 days after the Grant Date of Equipment Authorizations. It is our understanding that all measurement test reports, FCC ID label format and correspondent during certification review process cannot be granted as confidential documents and those information will be available for public review once the grant of equipment authorization is issued. Best Regards, External Photos Internal Photos Test Setup Photos Users Manual Min Zhang / Certification Manager ZTE Corporation Tel: +86-21-68897541 Fax: +86-21-50801070 E-mail: zhang.min13@zte.com.cn