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SC20-WL Hardware Design Smart Wi-Fi Module Series Rev: SC20-WL_Hardware_Design_V1.0 Date: 2019-12-16 www.quectel.com Smart Wi-Fi Module Series SC20-WL Hardware Design Our aim is to provide customers with timely and comprehensive service. For any assistance, please contact our company headquarters:
Quectel Wireless Solutions Co., Ltd. Building 5, Shanghai Business Park Phase III (Area B), No.1016 Tianlin Road, Minhang District, Shanghai, China 200233 Tel: +86 21 5108 6236 Email: info@quectel.com Or our local office. For more information, please visit:
http://www.quectel.com/support/sales.htm For technical support, or to report documentation errors, please visit:
http://www.quectel.com/support/technical.htm Or email to: support@quectel.com GENERAL NOTES QUECTEL OFFERS THE INFORMATION AS A SERVICE TO ITS CUSTOMERS. THE INFORMATION PROVIDED IS BASED UPON CUSTOMERS REQUIREMENTS. QUECTEL MAKES EVERY EFFORT TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE. QUECTEL DOES NOT MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN, AND DOES NOT ACCEPT ANY LIABILITY FOR ANY INJURY, LOSS OR DAMAGE OF ANY KIND INCURRED BY USE OF OR RELIANCE UPON THE INFORMATION. ALL INFORMATION SUPPLIED HEREIN IS SUBJECT TO CHANGE WITHOUT PRIOR NOTICE. COPYRIGHT THE INFORMATION CONTAINED HERE IS PROPRIETARY TECHNICAL INFORMATION OF QUECTEL CO., LTD. TRANSMITTING, REPRODUCTION, DISSEMINATION AND EDITING OF THIS DOCUMENT AS WELL AS UTILIZATION OF THE CONTENT ARE FORBIDDEN WITHOUT PERMISSION. OFFENDERS WILL BE HELD LIABLE FOR PAYMENT OF DAMAGES. ALL RIGHTS ARE RESERVED IN THE EVENT OF A PATENT GRANT OR REGISTRATION OF A UTILITY MODEL OR DESIGN. Copyright Quectel Wireless Solutions Co., Ltd. 2018. All rights reserved. SC20-WL_Hardware_Design 1 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design About the Document History Revision Date Author Description 1.0 2019-12-16 Quinn.lv Initial SC20-WL_Hardware_Design 2 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Contents About the Document ................................................................................................................................... 2 Contents ....................................................................................................................................................... 3 Table Index ................................................................................................................................................... 5 Figure Index ................................................................................................................................................. 6 1 Introduction ........................................................................................................................................ 11 1.1. Safety Information.................................................................................................................... 11 2 Product Concept ................................................................................................................................ 13 2.1. General Description ................................................................................................................. 13 2.2. Key Features ........................................................................................................................... 14 Functional Diagram ................................................................................................................. 16 2.3. 2.4. Evaluation Board ..................................................................................................................... 17 3.5. 3.5.1. 3.5.2. 3 Application Interfaces ....................................................................................................................... 18 3.1. General Description ................................................................................................................. 18 Pin Assignment ........................................................................................................................ 19 3.2. 3.3. Pin Description ......................................................................................................................... 20 Power Supply ........................................................................................................................... 29 3.4. 3.4.1. Power Supply Pins ......................................................................................................... 29 3.4.2. Decrease Voltage Drop .................................................................................................. 29 3.4.3. Reference Design for Power Supply .............................................................................. 30 Turn on and off Scenarios ....................................................................................................... 31 Turn on Module Using the PWRKEY ............................................................................. 31 Turn off Module .............................................................................................................. 33 VRTC Interface ........................................................................................................................ 34 3.6. Power Output ........................................................................................................................... 35 3.7. Battery Charge and Management ........................................................................................... 35 3.8. 3.9. USB Interface .......................................................................................................................... 37 3.10. UART Interfaces ...................................................................................................................... 39 3.11. SD Card Interface .................................................................................................................... 40 3.12. GPIO Interfaces ....................................................................................................................... 42 3.13. SPI Interface ............................................................................................................................ 44 3.14. I2C Interfaces .......................................................................................................................... 45 3.15. ADC Interfaces ........................................................................................................................ 46 3.16. Motor Drive Interface ............................................................................................................... 46 3.17. LCM Interface .......................................................................................................................... 47 3.18. Touch Panel Interface .............................................................................................................. 50 3.19. Camera Interfaces ................................................................................................................... 51 3.19.1. Rear Camera Interface................................................................................................... 51 3.19.2. Front Camera Interface .................................................................................................. 53 3.19.3. Design Considerations ................................................................................................... 55 3.20. Sensor Interfaces..................................................................................................................... 56 SC20-WL_Hardware_Design 3 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 3.21. Audio Interfaces ....................................................................................................................... 57 3.21.1. Reference Circuit Design for Microphone ...................................................................... 58 3.21.2. Reference Circuit Design for Receiver Interface ........................................................... 58 3.21.3. Reference Circuit Design for Headphone Interface ....................................................... 59 3.21.4. Reference Circuit Design for Loudspeaker Interface..................................................... 59 3.21.5. Audio Interface Design Considerations ......................................................................... 59 3.22. Emergency Download Interface .............................................................................................. 60 4 Wi-Fi and BT ....................................................................................................................................... 61 4.1. Wi-Fi Overview ........................................................................................................................ 61 4.1.1. Wi-Fi Performance ......................................................................................................... 61 BT Overview ............................................................................................................................ 63 4.2.1. BT Performance ............................................................................................................. 64 4.2. 5 Antenna Interface ............................................................................................................................... 65 5.1. Wi-Fi/BT Antenna Interface ..................................................................................................... 65 5.1.1. Reference Design of RF Layout..................................................................................... 66 Antenna Installation ................................................................................................................. 68 5.2.1. Antenna Requirements .................................................................................................. 68 5.2.2. Recommended RF Connector for Antenna Installation ................................................. 68 5.2. 6 Electrical, Reliability and Radio Characteristics ............................................................................ 70 6.1. Absolute Maximum Ratings ..................................................................................................... 70 6.2. Power Supply Ratings ............................................................................................................. 70 6.3. Charging Performance Specifications ..................................................................................... 71 6.4. Operation and StorageTemperatures ...................................................................................... 71 Current Consumption .............................................................................................................. 72 6.5. 6.6. Electrostatic Discharge ............................................................................................................ 73 7 Mechanical Dimensions .................................................................................................................... 74 7.1. Mechanical Dimensions of the Module.................................................................................... 74 7.2. Recommended Footprint ......................................................................................................... 76 Top and Bottom Views of the Module ...................................................................................... 77 7.3. 8 Storage, Manufacturing and Packaging .......................................................................................... 78 8.1. Storage..................................................................................................................................... 78 8.2. Manufacturing and Soldering .................................................................................................. 79 8.3. Packaging ................................................................................................................................ 80 9 Appendix A References ..................................................................................................................... 82 SC20-WL_Hardware_Design 4 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Table Index TABLE 1: SC20-WL FREQUENCY BANDS ...................................................................................................... 13 TABLE 2: SC20-WL KEY FEATURES ............................................................................................................... 14 TABLE 3: I/O PARAMETERS DEFINITION ....................................................................................................... 20 TABLE 4: PIN DESCRIPTION ........................................................................................................................... 20 TABLE 5: POWER DESCRIPTION ................................................................................................................... 35 TABLE 6: PIN DEFINITION OF USB INTERFACE ........................................................................................... 37 TABLE 7: USB TRACE LENGTH INSIDE THE MODULE ................................................................................. 38 TABLE 8: PIN DESCRIPTION OF UART INTERFACES .................................................................................. 39 TABLE 9: PIN DEFINITION OF SD CARD INTERFACE .................................................................................. 40 TABLE 10: SDIO TRACE LENGTH INSIDE THE MODULE ............................................................................. 42 TABLE 11: PIN DEFINITION OF GPIO INTERFACES...................................................................................... 42 TABLE 12: PIN DEFINITION OF SPI INTERFACE ........................................................................................... 45 TABLE 13: PIN DEFINITION OF I2C INTERFACE ........................................................................................... 45 TABLE 14: PIN DEFINITION OF ADC INTERFACES ....................................................................................... 46 TABLE 15: PIN DEFINITION OF MOTOR DRIVE INTERFACE ....................................................................... 46 TABLE 16: PIN DEFINITION OF LCM INTERFACE ......................................................................................... 47 TABLE 17: PIN DEFINITION OF TOUCH PANEL INTERFACE ....................................................................... 50 TABLE 18: PIN DEFINITION OF REAR CAMERA INTERFACE ...................................................................... 52 TABLE 19: PIN DEFINITION OF FRONT CAMERA INTERFACE .................................................................... 53 TABLE 20: MIPI TRACE LENGTH INSIDE THE MODULE............................................................................... 55 TABLE 21: PIN DEFINITION OF SENSOR INTERFACES ............................................................................... 56 TABLE 22: PIN DEFINITION OF AUDIO INTERFACES ................................................................................... 57 TABLE 23: Wi-Fi TRANSMITTING PERFORMANCE ....................................................................................... 61 TABLE 24: Wi-Fi RECEIVING PERFORMANCE .............................................................................................. 62 TABLE 25: BT DATA RATE AND VERSION ...................................................................................................... 63 TABLE 26: BT TRANSMITTING AND RECEIVING PERFORMANCE ............................................................. 64 TABLE 27: PIN DEFINITION OF Wi-Fi/BT ANTENNA ...................................................................................... 65 TABLE 28: Wi-Fi/BT FREQUENCY ................................................................................................................... 65 TABLE 29: ANTENNA REQUIREMENTS .......................................................................................................... 68 TABLE 30: ABSOLUTE MAXIMUM RATINGS .................................................................................................. 70 TABLE 31: SC20-WL MODULE POWER SUPPLY RATINGS .......................................................................... 70 TABLE 32: CHARGING PERFORMANCE SPECIFICATIONS ......................................................................... 71 TABLE 33: OPERATION TEMPERATURE ........................................................................................................ 71 TABLE 34: SC20-WL CURRENT CONSUMPTION .......................................................................................... 72 TABLE 35: ESD CHARACTERISTICS (TEMPERATURE: 25C, HUMIDITY: 45%) ......................................... 73 TABLE 36: RECOMMENDED THERMAL PROFILE PARAMETERS ............................................................... 79 TABLE 37: REEL PACKAGING ......................................................................................................................... 81 TABLE 38: RELATED DOCUMENTS ................................................................................................................ 82 TABLE 39: TERMS AND ABBREVIATIONS ...................................................................................................... 82 SC20-WL_Hardware_Design 5 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Figure Index FIGURE 1: FUNCTIONAL DIAGRAM ............................................................................................................... 17 FIGURE 2: PIN ASSIGNMENT (TOP VIEW)..................................................................................................... 19 FIGURE 3: VOLTAGE DROP SAMPLE ............................................................................................................. 30 FIGURE 4: POWER SUPPLY ........................................................................................................................... 30 FIGURE 5: REFERENCE CIRCUIT OF POWER SUPPLY .............................................................................. 31 FIGURE 6: TURN ON THE MODULE USING DRIVING CIRCUIT ................................................................... 32 FIGURE 7: TURN ON THE MODULE USING KEYSTROKE ........................................................................... 32 FIGURE 8: TIMING OF TURNING ON MODULE ............................................................................................. 33 FIGURE 9: TIMING OF TURNING OFF MODULE ........................................................................................... 34 FIGURE 10: RTC POWERED BY COIN CELL ................................................................................................. 34 FIGURE 11: RTC POWERED BY CAPACITOR ................................................................................................ 34 FIGURE 12: REFERENCE DESIGN FOR BATTERY CHARGING CIRCUIT ................................................... 36 FIGURE 13: USB INTERFACE REFERENCE DESIGN (OTG IS NOT SUPPORTED) ................................... 37 FIGURE 14: USB INTERFACE REFERENCE DESIGN (OTG IS SUPPORTED) ............................................ 38 FIGURE 15: REFERENCE CIRCUIT WITH LEVEL TRANSLATOR CHIP (FOR UART1) ............................... 39 FIGURE 16: RS232 LEVEL MATCH CIRCUIT (FOR UART1) .......................................................................... 40 FIGURE 17: REFERENCE CIRCUIT FOR SD CARD INTERFACE ................................................................. 41 FIGURE 18: REFERENCE CIRCUIT FOR MOTOR CONNECTION ................................................................ 47 FIGURE 19: REFERENCE CIRCUIT DESIGN FOR LCM INTERFACE ........................................................... 49 FIGURE 20: REFERENCE DESIGN FOR BACKLIGHT DIRVING CIRCUIT ................................................... 50 FIGURE 21: REFERENCE CIRCUIT DESIGN FOR TP INTERFACE .............................................................. 51 FIGURE 22: REFERENCE CIRCUIT DESIGN FOR REAR CAMERA INTERFACE ........................................ 53 FIGURE 23: REFERENCE CIRCUIT DESIGN FOR FRONT CAMERA INTERFACE ...................................... 54 FIGURE 24: REFERENCE CIRCUIT DESIGN FOR MICROPHONE INTERFACE ......................................... 58 FIGURE 25: REFERENCE CIRCUIT DESIGN FOR RECEIVER INTERFACE ................................................ 58 FIGURE 26: REFERENCE CIRCUIT DESIGN FOR HEADPHONE INTERFACE ........................................... 59 FIGURE 27: REFERENCE CIRCUIT DESIGN FOR LOUDSPEAKER INTERFACE ....................................... 59 FIGURE 28: REFERENCE CIRCUIT DESIGN FOR EMERGENCY DOWNLOAD INTERFACE ..................... 60 FIGURE 29: REFERENCE CIRCUIT DESIGN FOR Wi-Fi/BT ANTERNNA ..................................................... 65 FIGURE 30: MICROSTRIP LINE DESIGN ON A 2-LAYER PCB ...................................................................... 66 FIGURE 31: COPLANAR WAVEGUIDE LINE DESIGN ON A 2-LAYER PCB .................................................. 66 FIGURE 32: COPLANAR WAVEGUIDE LINE DESIGN ON A 4-LAYER PCB (LAYER 3 AS REFERENCE GROUND) .......................................................................................................................................................... 67 FIGURE 33: COPLANAR WAVEGUIDE LINE DESIGN ON A 4-LAYER PCB (LAYER 4 AS REFERENCE GROUND) .......................................................................................................................................................... 67 FIGURE 34: DIMENSIONS OF THE U.FL-R-SMT CONNECTOR (UNIT: MM) ................................................ 68 FIGURE 35: MECHANICAL PARAMETERS OF U.FL-LP CONNECTORS ...................................................... 69 FIGURE 36: SPACE FACTOR OF MATED CONNECTORS (UNIT: MM) ......................................................... 69 FIGURE 37: MODULE TOP AND SIDE DIMENSIONS ..................................................................................... 74 FIGURE 38: MODULE BOTTOM DIMENSIONS (TOP VIEW) ......................................................................... 75 FIGURE 39: RECOMMENDED FOOTPRINT (TOP VIEW) .............................................................................. 76 SC20-WL_Hardware_Design 6 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design FIGURE 40: TOP VIEWS OF THE MODULE ................................................................................................... 77 FIGURE 41: BOTTOM VIEW OF THE MODULE .............................................................................................. 77 FIGURE 42: REFLOW SOLDERING THERMAL PROFILE .............................................................................. 79 FIGURE 43: TAPE DIMENSIONS ..................................................................................................................... 80 FIGURE 44: REEL DIMENSIONS ..................................................................................................................... 81 SC20-WL_Hardware_Design 7 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design OEM/Integrators Installation Manual Important Notice to OEM integrators 1. This module is limited to OEM installation ONLY. 2. This module is limited to installation in mobile or fixed applications, according to Part 2.1091(b). 3. The separate approval is required for all other operating configurations, including portable configurations with respect to Part 2.1093 and different antenna configurations 4. For FCC Part 15.31 (h) and (k): The host manufacturer is responsible for additional testing to verify compliance as a composite system. When testing the host device for compliance with Part 15 Subpart B, the host manufacturer is required to show compliance with Part 15 Subpart B while the transmitter module(s) are installed and operating. The modules should be transmitting and the evaluation should confirm that the module's intentional emissions are compliant (i.e. fundamental and out of band emissions). The host manufacturer must verify that there are no additional unintentional emissions other than what is permitted in Part 15 Subpart B or emissions are complaint with the transmitter(s) rule(s). The Grantee will provide guidance to the host manufacturer for Part 15 B requirements if needed. End Product Labeling When the module is installed in the host device, the FCC/IC ID label must be visible through a window on the final device or it must be visible when an access panel, door or cover is easily re-moved. If not, a second label must be placed on the outside of the final device that contains the following text:
Contains FCC ID: XMR201911SC20WL Contains IC: 10224A-2019SC20WL The FCC ID/IC ID can be used only when all FCC/IC compliance requirements are met. In the event that these conditions cannot be met (for example certain laptop configurations or co-location with another transmitter), then the FCC/IC authorization is no longer considered valid and the FCC ID/IC ID cannot be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate FCC/IC authorization. Manual Information to the End User The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the users manual of the end product which integrates this module. The end user manual shall include all required regulatory information/warning as show in this manual. Federal Communication Commission Interference Statement This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular SC20-WL_Hardware_Design 8 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help. Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. Industry Canada Statement This device complies with Industry Canadas licence-exempt RSSs. Operation is subject to the following two conditions:
(1) This device may not cause interference; and
(2) This device must accept any interference, including interference that may cause undesired operation of the device. Le prsent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorise aux deux conditions suivantes:
(1) l'appareil ne doit pas produire de brouillage, et
(2) l'utilisateur de l'appareil doit accepter tout brouillage radiolectrique subi, mme si le brouillage est susceptible d'en compromettre le fonctionnement."
The device could automatically discontinue transmission in case of absence of information to transmit, or operational failure. Note that this is not intended to prohibit transmission of control or signaling information or the use of repetitive codes where required by the technology. The device for operation in the band 51505250 MHz is only for indoor use to reduce the potential for harmful interference to co-channel mobile satellite systems; The maximum antenna gain permitted for devices in the bands 52505350 MHz and 54705725 MHz shall comply with the e.i.r.p. limit; and The maximum antenna gain permitted for devices in the band 57255825 MHz shall comply with the e.i.r.p. limits specified for point-to-point and non point-to-point operation as appropriate. L'appareil peut interrompre automatiquement la transmission en cas d'absence d'informations transmettre ou de panne oprationnelle. Notez que ceci n'est pas destin interdire la transmission d'informations de contrle ou de signalisation ou l'utilisation de codes rptitifs lorsque cela est requis par la technologie. Le dispositif utilis dans la bande 5150-5250 MHz est rserv une utilisation en intrieur afin de rduire le risque de brouillage prjudiciable aux systmes mobiles par satellite dans le mme canal; Le gain d'antenne maximal autoris pour les dispositifs dans les bandes 5250-5350 MHz et 5470-5725 MHz doit tre conforme la norme e.r.p. limite; et Le gain d'antenne maximal autoris pour les appareils de la SC20-WL_Hardware_Design 9 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design bande 5725-5825 MHz doit tre conforme la norme e.i.r.p. les limites spcifies pour un fonctionnement point point et non point point, selon le cas CAN ICES-3(B)/ NMB-3(B) Radiation Exposure Statement This equipment complies with FCC/IC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20 cm between the radiator &
your body. SC20-WL_Hardware_Design 10 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 1 Introduction This document defines the SC20-WL module, its air interface and hardware interface which are connected with customers application. This document can help customers quickly understand module interface specifications, electrical and mechanical details as well as other related information of SC20-WL module. Associated with application notes and user guides, customers can use SC20-WL module to design and set up mobile applications easily. 1.1. Safety Information The following safety precautions must be observed during all phases of operation, such as usage, service or repair of any cellular terminal or mobile incorporating SC20-WL module. Manufacturers of the cellular terminal should send the following safety information to users and operating personnel and incorporate these guidelines into all manuals supplied with the product. If not so, Quectel assumes no liability for customers failure to comply with these precautions. Full attention must be given to driving at all times in order to reduce the risk of an accident. Using a mobile while driving (even with a handsfree kit) causes distraction and can lead to an accident. Please comply with laws and regulations restricting the use of wireless devices while driving. Switch off the cellular terminal or mobile before boarding an aircraft. The operation of wireless appliances in an aircraft is forbidden to prevent interference with communication systems. If the device offers an Airplane Mode, then it should be enabled prior to boarding an aircraft. Please consult the airline staff for more restrictions on the use of wireless devices on boarding the aircraft. Wireless devices may cause interference on sensitive medical equipment, so please be aware of the restrictions on the use of wireless devices when in hospitals, clinics or other healthcare facilities. Cellular terminals or mobiles operating over radio signals and cellular network cannot be guaranteed to connect in all possible conditions (for example, with SC20-WL_Hardware_Design 11 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design unpaid bills or with an invalid (U)SIM card). When emergent help is needed in such conditions, please remember using emergency call. In order to make or receive a call, the cellular terminal or mobile must be switched on in a service area with adequate cellular signal strength. The cellular terminal or mobile contains a transmitter and receiver. When it is ON, it receives and transmits radio frequency signals. RF interference can occur if it is used close to TV set, radio, computer or other electric equipment. In locations with potentially explosive atmospheres, obey all posted signs to turn off wireless devices such as your phone or other cellular terminals. Areas with potentially explosive atmospheres include fueling areas, below decks on boats, fuel or chemical transfer or storage facilities, areas where the air contains chemicals or particles such as grain, dust or metal powders, etc. SC20-WL_Hardware_Design 12 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 2 Product Concept 2.1. General Description SC20-WL is a series of Smart Wi-Fi module based on Qualcomm platform and Linux operating system, and provides industrial grade performance. Its general features are listed below:
Support short-range wireless communication via Wi-Fi 802.11a/b/g/n and BT4.2 LE. processing unit. Support multiple audio and video codecs. Built-in high performance AdrenoTM 304 graphics Enable smooth play of 720P videos. Provide multiple audio and video input/output interfaces as well as abundant GPIO interfaces. The following table shows the supported Wi-Fi/BT standards and frequency range of SC20-WL series module. Table 1: SC20-WL Frequency Bands Type Network Standard Frequency Range IEEE 802.11b/g/n 2402MHz~2482MHz SC20-WL R1.1 IEEE 802.11a/n 5180MHz~5825MHz BT4.2 LE 2402MHz~2480MHz SC20-WL is an SMD type module, which can be embedded into applications through its 210-pin pads including 146 LCC signal pads and 64 other pads. With a compact profile of 40.5mm 40.5mm 2.8mm, SC20-WL can meet almost all requirements for M2M applications such as CPE, wireless POS, smart metering, automotive, digital signage, alarm panel, security and industrial PDA. SC20-WL_Hardware_Design 13 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 2.2. Key Features The following table describes the detailed features of SC20-WL module. Table 2: SC20-WL Key Features Feature Details Applications Processor ARM Cortex-A7 microprocessor cores (quad-core) up to 1.1 GHz 512KB L2 cache Modem DSP Memory QDSP6 v5 core up to 691.2MHz 768KB L2 cache 8GB eMMC + 8Gb LPDDR3 16GB eMMC + 16Gb LPDDR3 Operating System Linux Power Supply Supply voltage: 3.5V~4.2V Typical supply voltage: 3.8V SC20-WL R1.1 2.4GHz/5GHz double frequency bands Support 802.11a/b/g/n standards, with max data rate up to 150Mbps Support AP mode 3GPP TS 27.007 and 3GPP TS 27.005 AT commands as well as Quectel enhanced AT commands 4-lane MIPI_DSI, up to 1.5Gbps for each lane Support WVGA (2-lane MIPI_DSI), up to 720p (4-lane MIPI_DSI) 24-bit color depth Use MIPI_CSI, up to 1.5Gbps per lane Support two cameras:
2-lane MIPI_CSI for rear camera, max pixel up to 8MP 1-lane MIPI_CSI for front camera, max pixel up to 2MP Bluetooth Feature BT4.2 LE WLAN Features AT Commands LCM Interface Camera Interfaces Video Codec Video encoding:
H.264 BP/MP 720p @30fps MPEG-4 SP/H.263 P0 WVGA @30fps VP8 WVGA @30fps Video decoding:
H.264 BP/MP/HP 1080P @30fps MPEG-4 SP/ASP 1080P @30fps DivX 4x/5x/6x 1080P @30fps H.263 P0 WVGA @30fps SC20-WL_Hardware_Design 14 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Audio Codec HR, FR, EFR, AMR, AMR-WB Audio Interfaces USB Interface VP8 1080P @30 fps
(HEVC) H.265 MP 8 bit 1080P @30fps Audio input:
2 groups of analog microphone input, integrating internal bias voltage Audio output:
Class AB stereo headphone output Class AB earpiece differential output Class D speaker differential amplifier output Compliant with USB 2.0 specification; the data transfer rate can reach up to 480Mbps Used for AT command communication, data transmission, software debugging and firmware upgrade Support USB OTG (Need additional 5V power supply chip) USB Driver: Support Windows XP, Windows Vista, Windows 7/8/8.1, Linux 2.6 or later 2 UART interfaces: UART1 and UART2 UART1: 4-wire UART interface with RTS/CTS hardware flow control;
UART Interfaces baud rate up to 4Mbps UART2: 2-wire UART interface used for debugging Motor Drive Interface Drive ERM motor SD Card Interface I2C Interfaces 3 groups of I2C Used for peripherals such as camera, sensor, touch panel, etc. Support SD 3.0, 4-bit SDIO Support hot-plug Support 3 ADC interfaces;
Used general-purpose ADC for ADC Interfaces input voltage sense, battery temperature detection and Real Time Clock Supported Antenna Interface Wi-Fi/BT antenna Physical Characteristics Size: (40.50.15)mm (40.50.15)mm (2.80.2) mm Package: LCC Weight: approx. 9.8g Temperature Range Operation temperature range: -35C~+65C 1) Storage temperature range: -40C ~ +90C Firmware Upgrade Over USB interface RoHS All hardware components are fully compliant with EU RoHS directive SC20-WL_Hardware_Design 15 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design NOTES 1. 1) Within operation temperature range, the module is IEEE specifications. 2. 2) Within extended temperature range, the module remains the ability for data transmission. There is no unrecoverable malfunction. There are also no effects on radio spectrum and no harm to radio network. Only one or more parameters like Pout might reduce in their value and exceed the specified tolerances. When the temperature returns to the normal operation temperature levels, the module will meet IEEE specifications again. 2.3. Functional Diagram The following figure shows a block diagram of SC20-WL and illustrates the major functional parts. Power management Radio frequency Baseband LPDDR3+EMMC flash Peripheral interfaces
-- USB interface
-- UART interfaces
-- SD card interface
-- I2C interfaces
-- ADC interfaces
-- LCM (MIPI) interface
-- Touch Panel interface
-- Camera (MIPI) interfaces
-- Audio interfaces SC20-WL_Hardware_Design 16 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Figure 1: Functional Diagram 2.4. Evaluation Board In order to help customers to develop applications with SC20-WL, Quectel supplies the evaluation board
(Smart-EVB), RS-232 to USB cable, USB data cable, earphone, antenna and other peripherals to control or test the module. For more details, please refer to document [1]. SC20-WL_Hardware_Design 17 / 81 ANT_WIFI/BT SAW WCN LPDDR3+
EMMC Baseband VBAT_BB USB_VBUS VRTC PWRKEY RESET_N AUDIO ADC PMIC 19.2M XO LDO Output LCM (MIPI) TP CAM (MIPI) USB UART I2C GPIO SD Card Smart Wi-Fi Module Series SC20-WL Hardware Design 3 Application Interfaces 3.1. General Description SC20-WL is equipped with 146-pin 1.0mm pitch SMT pads plus 64-pin ground/reserved pads that can be embedded into wireless application platforms. The following chapters provide the detailed description of pins/interfaces listed below. Power supply VRTC interface USB interface UART interfaces SD card interface GPIO interfaces SPI interface I2C interfaces ADC interfaces Motor drive interface LCM interface TP interface Camera interfaces Sensor interfaces Audio interfaces Emergency download interface SC20-WL_Hardware_Design 18 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 3.2. Pin Assignment The following figure shows the pin assignment of SC20-WL module. Figure 2: Pin Assignment (Top View) SC20-WL_Hardware_Design 19 / 81 S U B V _ B S U S U B V _ B S U 2 4 1 1 4 1 D N G 0 4 1 D N G 4 4 1 D N G 3 4 1 6 4 1 5 4 1 T E D _ S H L _ H P H D N G _ H P H R _ H P H D N G M R E H T _ T A B V S N S _ T A B V 5 8 V 2 _ 7 1 O D L D N G D N G C D A L E S _ E G R A H C 7 2 1 C T R V 6 2 1 9 3 1 8 3 1 7 3 1 6 3 1 5 3 1 4 3 1 3 3 1 2 3 1 1 3 1 0 3 1 9 2 1 8 2 1 5 2 1 4 2 1 3 2 1 2 2 1 1 2 1 8 V 1 _ 6 O D L 7 1 _ O P G I 6 1 _ O P G I D N G 8 _ O P G I 9 1 1 9 _ O P G I 8 1 1 D N G 0 2 1 0 1 _ O P G I 1 1 _ O P G I 5 9 _ O P G I 7 1 1 6 1 1 5 1 1 Y E K R W P 4 1 1 9 9 _ O P G I 3 1 1 8 V 1 _ 5 O D L 8 5 _ O P G I 2 1 1 1 1 1 8 7 1 7 7 1 2 7 1 1 7 1 149 179 195 206 190 168 150 180 196 205 189 167 151 181 197 204 188 166 152 182 198 203 187 165 6 7 1 4 9 1 0 1 2 9 9 1 3 8 1 7 5 1 5 7 1 3 9 1 9 0 2 0 0 2 4 8 1 8 5 1 4 7 1 2 9 1 8 0 2 1 0 2 5 8 1 9 5 1 3 7 1 1 9 1 7 0 2 2 0 2 6 8 1 0 6 1 VBAT_BB VBAT_BB GND MIC1P MIC_GND MIC2P GND EARP EARN SPKP SPKN GND USB_DM USB_DP GND USB_ID GND VIB_DRV PWM TP_INT TP_RST SD_LDO12 GPIO_23 UART1_TXD UART1_RXD UART1_CTS UART1_RTS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 147 148 153 154 170 169 164 163 110 109 108 107 106 105 104 103 102 101 100 102 99 GPIO_96 GPIO_65 GPIO_36 GPIO_94 GPIO_98 GPIO_0 GPIO_110 GPIO_97 GPIO_68 GPIO_69 GPIO_89 GPIO_88 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 GPIO_92 GPIO_31 KEY_VOL_DOWN KEY_VOL_UP UART2_TXD UART2_RXD SENSOR_I2C_SDA SENSOR_I2C_SCL GPIO_32 GND GND GND GND CAM_I2C_SDA CAM_I2C_SCL CAM1_PWD CAM1_RST CAM0_PWD CAM0_RST GND ANT_WIFI/BT GND CAM1_MCLK CAM0_MCLK 5 5 1 6 5 1 1 6 1 2 6 1 8 3 9 3 0 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 4 9 4 0 5 1 5 2 5 3 5 4 5 5 5 6 5 7 5 8 5 9 5 0 6 1 6 2 6 3 6 4 6 5 6 6 6 7 6 8 6 9 6 0 7 1 7 2 7 3 7 K L C _ D S D M C _ D S 1 1 O D L _ D S 0 A T A D _ D S 1 A T A D _ D S 2 A T A D _ D S 3 A T A D _ D S T E D _ D S T O O B _ B S U L C S _ C 2 I _ P T A D S _ C 2 I _ P T D N G E T _ D C L T S R _ D C L N K L C _ I S D _ I P M I P K L C _ I S D _ I P M I N 0 N L _ I S D _ I P M I P 0 N L _ I S D _ I P M I N 1 N L _ I S D _ I P M I P 1 N L _ I S D _ I P M I N 2 N L _ I S D _ I P M I P 2 N L _ I S D _ I P M I N 3 N L _ I S D _ I P M I P 3 N L _ I S D _ I P M I D N G D N G N K L C _ 0 I S C _ I P M I P K L C _ 0 I S C _ I P M I N 0 N L _ 0 I S C _ I P M I P 0 N L _ 0 I S C _ I P M I N 1 N L _ 0 I S C _ I P M I P 1 N L _ 0 I S C _ I P M I N K L C _ 1 I S C _ I P M I P K L C _ 1 I S C _ I P M I N 0 N L _ 1 I S C _ I P M I P 0 N L _ 1 I S C _ I P M I SDC2 USB GND UART OTHERS GPIO ANT AUDIO TP CAMERA LCM RESERVED POWER Smart Wi-Fi Module Series SC20-WL Hardware Design 3.3. Pin Description The following tables show the SC20-WLs pin definition. Table 3: I/O Parameters Definition Type IO DI DO PI PO AI AO OD Description Bidirectional Digital input Digital output Power input Power output Analog input Analog output Open drain The following tables show the SC20-WLs pin definition and electrical characteristics. Table 4: Pin Description Power Supply Pin Name Pin No. I/O Description DC Characteristics Comment VBAT_BB 1, 2 PI Power supply for modules baseband part Vmax=4.2V Vmin=3.5V Vnorm=3.8V VRTC 126 LDO5_1V8 111 PI/
PO PO Power supply for internal RTC circuit VOmax=3.2V VI=2.0V~3.25V IIN max=200uA 1.8V output power supply Vnorm=1.8V IOmax=20mA Power supply for external GPIOs SC20-WL_Hardware_Design 20 / 81 It must be able to provide sufficient current up to 3.0A. It is suggested to use a zener diode for voltage stabilization. If unused, keep this pin open. Smart Wi-Fi Module Series SC20-WL Hardware Design pull up circuits and level conversion circuit. Power supply for peripherals. 2.2uF~4.7uF capacitor is recommended to be applied to the LDO6_1V8 pin. If unused, keep this pin open. Power supply for peripherals. 2.2uF~4.7uF capacitor is recommended to be applied to the LDO17_2V85 pin. If unused, keep this pin open. Power supply for SD cards pull-up circuit. LDO6_1V8 125 PO 1.8V output power supply Vnorm=1.8V IOmax=100mA LDO17_ 2V85 129 PO 2.85V output power supply Vnorm=2.85V IOmax=300mA SD_LDO11 38 SD_LDO12 32 PO PO Power supply for SD card Vnorm=2.95V IOmax=600mA 1.8V/2.95V output power supply Vnorm=2.95V IOmax=50mA GND GND 3, 7, 12, 15, 27, 51, 62, 69, 76, 78, 85, 86, 88, 89, 120, 122, 130, 132, 135, 140, 143, 144, 147~150, 160~178, 180~182, 184~186, 188, 189, 192, 193, 198, 200, 201, 208, 209 SC20-WL_Hardware_Design 21 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Pin Name Pin No. I/O Description DC Characteristics Comment Audio Interfaces MIC1P 4 MIC_GND 5 MIC2P EARP EARN SPKP SPKN 6 8 9 10 11 HPH_R 136 HPH_GND 137 HPH_L 138 HS_DET 139 USB Interface AI AI AO AO AO AO AO AO AI Microphone positive input for channel 1 MIC reference ground Microphone positive input for channel 2 Earpiece positive output Earpiece negative output Speaker positive output Speaker negative output Headphone right channel output Headphone virtual ground Headphone left channel output Headset insertion detection Pin Name Pin No. I/O Description USB_VBUS 141, 142 PI USB power supply USB_DM 13 USB_DP 14 IO IO USB differential data bus (minus) USB differential data bus (plus) USB_ID 16 AI USB ID detection UART Interfaces DC Characteristics Vmax=6.3V Vmin=4.35V Vnorm=5.0V Compliant with USB 2.0 standard specification. Pin Name Pin No. I/O Description DC Characteristics Comment High level by default. Comment Used for USB 5V power input and USB detection. Require differential impedance of 90. High level by default. SC20-WL_Hardware_Design 22 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 1.8V power domain. If unused, keep this pin open. 1.8V power domain. If unused, keep this pin open. 1.8V power domain. If unused, keep this pin open. 1.8V power domain. If unused, keep this pin open. 1.8V power domain. If unused, keep this pin open. 1.8V power domain. If unused, keep this pin open. 34 DO UART1 transmit data 35 DI UART1 receive data 36 DI UART1 clear to send VOLmax=0.45V VOHmin=1.35V VILmax=0.63V VIHmin=1.17V VILmax=0.63V VIHmin=1.17V 37 DO UART1 request to send VOLmax=0.45V VOHmin=1.35V 93 DI UART2 receive data. Debug port by default. VILmax=0.63V VIHmin=1.17V UART1_ TXD UART1_ RXD UART1_ CTS UART1_ RTS UART2_ RXD UART2_ TXD 94 DO UART2 transmit data. Debug port by default. SD Card Interface SD_CLK 39 DO High speed digital clock signal of SD card Pin Name Pin No. I/O Description Comment VOLmax=0.45V VOHmin=1.35V DC Characteristics 1.8V SD card:
VOLmax=0.45V VOHmin=1.4V 2.95V SD card:
VOLmax=0.37V VOHmin=2.2V 1.8V SD card:
VILmax=0.58V VIHmin=1.27V VOLmax=0.45V VOHmin=1.4V 2.95V SD card:
VILmax=0.73V VIHmin=1.84V SD_CMD 40 IO Command signal of SD card SC20-WL_Hardware_Design 23 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design SD_DET 45 DI Active low SD card insertion detection VOLmax=0.37V VOHmin=2.2V 1.8V SD card:
VILmax=0.58V VIHmin=1.27V VOLmax=0.45V VOHmin=1.4V 2.95V SD card:
VILmax=0.73V VIHmin=1.84V VOLmax=0.37V VOHmin=2.2V VILmax=0.63V VIHmin=1.17V DC Characteristics VILmax=0.63V VIHmin=1.17V VOLmax=0.45V VOHmin=1.35V SD_DATA0 41 SD_DATA1 42 SD_DATA2 43 IO IO IO SD_DATA3 44 IO High speed bidirectional digital signal lines of SD card Touch Panel (TP) Interface Pin Name Pin No. I/O Description TP_INT 30 DI Interrupt signal of TP TP_RST 31 DO Reset signal of TP TP_I2C_ SCL TP_I2C_ SDA 47 48 LCM Interface OD I2C clock signal of TP OD I2C data signal of TP 1.8V power domain. Active low. Comment 1.8V power domain. 1.8V power domain. 1.8V power domain. Pin Name Pin No. I/O Description DC Characteristics Comment PWM 29 DO Adjust the backlight brightness. PWM control signal. VOLmax=0.45V VOHmax=VBAT_BB LCD_RST 49 DO LCD reset signal VOLmax=0.45V VOHmin=1.35V LCD_TE 50 MIPI_DSI_ CLKN MIPI_DSI_ CLKP 52 53 LCD tearing effect signal VILmax=0.63V VIHmin=1.17V DI AO AO MIPI DSI clock signal
(negative) MIPI DSI clock signal
(positive) 1.8V power domain. Active low. 1.8V power domain. SC20-WL_Hardware_Design 24 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Pin Name Pin No I/O Description DC Characteristics Comment Camera Interfaces MIPI_DSI_ LN0N MIPI_DSI_ LN0P MIPI_DSI_ LN1N MIPI_DSI_ LN1P MIPI_DSI_ LN2N MIPI_DSI_ LN2P MIPI_DSI_ LN3N MIPI_DSI_ LN3P MIPI_CSI0_ CLKN MIPI_CSI0_ CLKP MIPI_CSI0_ LN0N MIPI_CSI0_ LN0P MIPI_CSI0_ LN1N MIPI_CSI0_ LN1P MIPI_CSI1_ CLKN MIPI_CSI1_ CLKP MIPI_CSI1_ LN0N MIPI_CSI1_ LN0P CAM0_ 54 55 56 57 58 59 60 61 63 64 65 66 67 68 70 71 72 73 74 AO AO AO AO AO AO AO AO AI AI AI AI AI AI AI AI AI AI MIPI DSI data signal
(negative) MIPI DSI data signal
(positive) MIPI DSI data signal
(negative) MIPI DSI data signal
(positive) MIPI DSI data signal
(negative) MIPI DSI data signal
(positive) MIPI DSI data signal
(negative) MIPI DSI data signal
(positive) MIPI CSI clock signal
(negative) MIPI CSI clock signal
(positive) MIPI CSI data signal
(negative) MIPI CSI data signal
(positive) MIPI CSI data signal
(negative) MIPI CSI data signal
(positive) MIPI CSI clock signal
(negative) MIPI CSI clock signal
(positive) MIPI CSI data signal
(negative) MIPI CSI data signal
(positive) DO Clock signal of rear VOLmax=0.45V SC20-WL_Hardware_Design 25 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design MCLK CAM1_ MCLK CAM0_ PWD CAM0_RST 79 CAM1_RST 81 CAM1_PW D CAM_I2C_ SCL CAM_I2C_ SDA Keypad Interfaces 75 80 82 83 84 camera VOHmin=1.35V Clock signal of front camera VOLmax=0.45V VOHmin=1.35V Reset signal of rear camera VOLmax=0.45V VOHmin=1.35V Power down signal of rear camera VOLmax=0.45V VOHmin=1.35V Reset signal of front camera VOLmax=0.45V VOHmin=1.35V Power down signal of front camera VOLmax=0.45V VOHmin=1.35V I2C clock signal of camera I2C data signal of camera DO DO DO DO DO OD OD DC Characteristics VILmax=0.63V VIHmin=1.17V VILmax=0.63V VIHmin=1.17V VILmax=0.63V VIHmin=1.17V DC Characteristics Pin Name Pin No. I/O Description PWRKEY 114 DI Turn on/off the module KEY_VOL_ UP KEY_VOL_ DOWN 95 96 SENSOR_I2C Interfaces DI Volume up DI Volume down Pin Name Pin No. I/O Description SENSOR_ I2C_SCL SENSOR_ I2C_SDA 91 92 ADC Interfaces I2C clock signal of external sensor I2C data signal of external sensor Pin Name Pin No. I/O Description ADC 128 General purpose ADC VBAT_SNS 133 Input voltage sense OD OD AI AI 1.8V power domain. 1.8V power domain. Comment Pull-up to 1.8V internally. Active low. If unused, keep this pin open. If unused, keep this pin open. Comment 1.8V power domain. 1.8V power domain. Maximum voltage not exceeding 1.7V. Maximum input voltage is 4.5V. DC Characteristics Comment SC20-WL_Hardware_Design 26 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design VBAT_ THERM 134 AI Battery temperature detection Pin Name Pin No. I/O Description DC Characteristics Comment 77 IO Wi-Fi/BT antenna 50 impedance Pin Name Pin No. I/O Description DC Characteristics Comment Antenna Interface ANT_ Wi-Fi/BT GPIO Interfaces GPIO_23 33 GPIO_32 90 GPIO_31 97 GPIO_92 98 GPIO_88 1) 99 GPIO_89 100 GPIO_69 101 GPIO_68 1) 102 GPIO_97 103 GPIO_110 104 GPIO_0 105 GPIO_98 106 GPIO_94 107 GPIO_36 108 GPIO_65 109 GPIO_96 110 GPIO_58 112 GPIO_99 113 IO IO IO IO IO IO IO IO IO IO IO IO IO IO IO IO IO IO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO 1.8V power domain 1.8V power domain 1.8V power domain 1.8V power domain 1.8V power domain 1.8V power domain 1.8V power domain 1.8V power domain 1.8V power domain 1.8V power domain 1.8V power domain 1.8V power domain 1.8V power domain 1.8V power domain 1.8V power domain 1.8V power domain 1.8V power domain 1.8V power domain VILmax=0.63V VIHmin=1.17V VOLmax=0.45V VOHmin=1.4V SC20-WL_Hardware_Design 27 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Pin Name Pin No. I/O Description DC Characteristics Comment VIB_DRV 28 PO Motor drive GPIO_95 115 GPIO_11 116 GPIO_10 117 GPIO_9 118 GPIO_8 119 GPIO_16 123 GPIO_17 124 Other Interfaces IO IO IO IO IO IO IO GPIO GPIO GPIO GPIO GPIO GPIO GPIO RESET_N 179 DI Reset the module USB_BOOT 46 DI Force the module to boot from USB port CHARGE_ SEL 127 DI Used for charger selection 1.8V power domain Multiplexed into SPI_CLK. Multiplexed into SPI_CS_N. Multiplexed into SPI_MISO. Multiplexed into SPI_MOSI 1.8V power domain 1.8V power domain Connected to the negative terminal of the motor. Disabled by default and can be enabled through software configuration. Set USB_BOOT to high level will force the module to enter into emergency download mode. If it is open, internal charger is used. If it is connected to GND, external charger is used. Reserved Interface Pin Name Pin No. I/O Description DC Characteristics Comment RESERVED Reserved pins Keep these pins open. 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 87, 121, 131, SC20-WL_Hardware_Design 28 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 145, 146, 151, 152, 153, 154, 155, 156, 157, 158, 159, 183, 187, 190, 191, 194, 195, 196, 197, 199, 202, 203, 204, 205, 206, 207, 210 1) GPIO_68 and GPIO_88 cannot be pulled up during start-up. NOTE 3.4. Power Supply 3.4.1. Power Supply Pins SC20-WL provides two VBAT pins dedicated to connection with the external power supply. The two VBAT_BB pins are used for modules baseband part. The power supply range of the module is 3.5V~4.2V, and the recommended value is 3.8V. VBAT performance, such as load capacity, ripple and spikes will directly affect the performance and stability of the module. If the voltage drops below 3.1V, the module will be turned off automatically. 3.4.2. Decrease Voltage Drop Make sure the input voltage will never drop below 3.1V. If the voltage drops below 3.1V, the module will be turned off automatically. SC20-WL_Hardware_Design 29 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Figure 3: Voltage Drop Sample To decrease voltage drop, a bypass capacitor of about 100F with low ESR (ESR=0.7) should be used, and a multi-layer ceramic chip (MLCC) capacitor should also be reserved due to its ultra-low ESR. It is recommended to use a ceramic capacitor (100nF) for the VBAT pins. The width of VBAT_BB trace should be no less than 1mm. In principle, the longer the VBAT trace is, the wider it will be. In addition, in order to get a stable power source, it is suggested to use a 0.5W zener diode and place it as close to the VBAT pins as possible. The following figure shows the star structure of the power supply. Figure 4: Power Supply 3.4.3. Reference Design for Power Supply The power design for the module is very important, as the performance of module largely depends on the power source. The power supply of SC20-WL should be able to provide sufficient current up to 3A at least. If the voltage drop between the input and output is not too high, it is suggested to use an LDO to supply power for the module. If there is a big voltage difference between the input source and the desired output
(VBAT), a buck converter is preferred to be used as the power supply. SC20-WL_Hardware_Design 30 / 81 Input current Voltage 3.8V 3.1V VBAT VBAT_BB
D1 C1 C2 100uF 100nF Module Smart Wi-Fi Module Series SC20-WL Hardware Design The following figure shows a reference design for +5V input power source which adopts an LDO
(MIC29302WU) from MICREL. The typical output voltage is 3.8V and the maximum rated current is 3.0A. Figure 5: Reference Circuit of Power Supply NOTES 1. It is suggested to switch off the power supply for module in abnormal state, and then switch on the power to restart the module. 2. The module supports battery charging function by default. If the above power supply design is adopted, please make sure the charging function is disabled by software or connect VBAT to Schottky diode in series to avoid the reverse current to the power supply chip. 3.5. Turn on and off Scenarios 3.5.1. Turn on Module Using the PWRKEY The module can be turned on by driving PWRKEY pin to a low level for at least 1.6s. PWRKEY pin is pulled to 1.8V internally. It is recommended to use an open drain/collector driver to control the PWRKEY. A simple reference circuit is illustrated in the following figure. SC20-WL_Hardware_Design 31 / 81 DC_IN VBAT MIC29302WU U1 2 IN N E 4 OUT J D A D N G 1 3 5 C1 470uF C2 R1 100nF 51K R2 100K 1%
R3 47K 1%
R4 470R C3 C4 470uF 100nF Smart Wi-Fi Module Series SC20-WL Hardware Design Figure 6: Turn on the Module Using Driving Circuit The other way to control the PWRKEY is using a button directly. A TVS component is indispensable to be placed nearby the button for ESD protection. A reference circuit is shown in the following figure. Figure 7: Turn on the Module Using Keystroke SC20-WL_Hardware_Design 32 / 81 PWRKEY 1.6s Turn on pulse R1 4.7K Q1 R2 47K S1 PWRKEY TVS Close to S1 Smart Wi-Fi Module Series SC20-WL Hardware Design The turn on scenario is illustrated in the following figure. Figure 8: Timing of Turning on Module NOTES shown above. 1. When the module is powered on for the first time, its timing of turning on will be 45ms longer than that 2. Make sure that VBAT is stable before pulling down PWRKEY pin. The recommended time between them is no less than 30ms. PWRKEY pin cannot be pulled down all the time. 3.5.2. Turn off Module Set the PWRKEY pin low for at least 1s, and then choose to turn off the module when the prompt window comes up. The other way to turn off the module is to drive PWRKEY to a low level for at least 8s. The module will execute forced shutdown. The forced power-down scenario is illustrated in the following figure. SC20-WL_Hardware_Design 33 / 81 VBAT (Typ.: 3.8V) PWRKEY 1.6s 173ms 173.5ms LDO5_1V8 LDO6_1V8 LDO17_2V85 438ms Others 40s Active Smart Wi-Fi Module Series SC20-WL Hardware Design Figure 9: Timing of Turning off Module 3.6. VRTC Interface The RTC (Real Time Clock) can be powered by an external power source through VRTC when the module is powered down and there is no power supply for the VBAT. The external power source can be capacitor or rechargeable battery (such as coil cells) according to application demands. The following are some reference circuit designs when an external battery or capacitor is utilized for powering RTC. Figure 10: RTC Powered by Coin Cell Figure 11: RTC Powered by Capacitor SC20-WL_Hardware_Design 34 / 81 VBAT PWRKEY Others
>8s Power down Coin Cell VRTC RTC Core Module Large Capacitance Capacitor C VRTC RTC Core Module Smart Wi-Fi Module Series SC20-WL Hardware Design If RTC is ineffective, it can be synchronized through network after the module is powered on. 2.0V~3.25V input voltage range and 3.0V typical value for VRTC. When VBAT is disconnected, the average consumption is typically 5uA. When powered by VBAT, the RTC error is 50ppm. When powered by VRTC, the RTC error is 200ppm. If the rechargeable battery is used, the ESR of the battery should be less than 2K, and it is recommended to use the MS621FE FL11E of SEIKO. If a large capacitance capacitor is selected, it is recommended to use a 100uF capacitor with low ESR. The capacitor is able to power the real-time clock for 45 seconds. 3.7. Power Output SC20-WL supports output of regulated voltages for peripheral circuits. During application, it is recommended to use parallel capacitors (33pF and 10pF) in the circuit to suppress high frequency noise. Pin Name Default Voltage (V) Driving Current (mA) Idle Table 5: Power Description LDO5_1V8 LDO6_1V8 LDO17_2V85 SD_LDO12 SD_LDO11 1.8 1.8 2.85 2.95 2.95 20 100 300 50 600 KEEP
3.8. Battery Charge and Management SC20-WL module can recharge over-discharged batteries. The battery charger in SC20-WL module supports trickle charging, constant current charging and constant voltage charging modes, which optimizes the charging procedure for Li-ion batteries. Trickle charging: There are two steps in this mode. When the battery voltage is below 2.8V, a 90mA trickle charging current is applied to the battery. When the battery voltage is charged up and is between 2.8V and 3.2V, the charging current can be set to 450mA maximally. Constant current mode (CC mode): When the battery is increased to between 3.2V and 4.2V, the SC20-WL_Hardware_Design 35 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design system will switch to CC mode. The maximum charging current is 1.44A when adapter is used for battery charging; and the maximum charging current is 450mA while USB charging. Constant voltage mode (CV mode): When the battery voltage reaches the final value 4.2V, the system will switch to CV mode and the charging current will decrease gradually. When the battery level reaches 100%, the charging is completed. SC20-WL module supports battery temperature detection in the condition that the battery integrates a thermistor (47K 1% NTC thermistor with B-constant of 4050K by default; SDNT1608X473F4050FTF of SUNLORD is recommended) and the thermistor is connected to VBAT_THERM pin. The default battery temperature range is from -3.0C~48.5C. If VBAT_THERM pin is not connected, there will be malfunctions such as battery charging failure, battery level display error, etc. A reference design for battery charging circuit is shown as below. Figure 12: Reference Design for Battery Charging Circuit Mobile devices such as mobile phones and handheld POS systems are powered by batteries. When different batteries are utilized, the charging and discharging curve has to be modified correspondingly so as to achieve the best effect. If thermistor is not available in the battery, or adapter is utilized for powering module, then there is only a need for VBAT and GND connection. In this case, the system may mistakenly judge that the battery temperature is abnormal, which will cause battery charging failure. In order to avoid this, VBAT_THERM should be connected to GND with a 47K resistor. If VBAT_THERM is unconnected, the system will be unable to detect the battery, making battery cannot be charged. VBAT_SNS pin must be connected. Otherwise, the module will have abnormalities in voltage detection, as well as associated power on/off and battery charging/discharging issues. SC20-WL_Hardware_Design 36 / 81 1 2 3 VBAT NTC GND Battery Adapter or USB USB_VBUS VBAT VBAT_SNS R1 0R VBAT_THERM GND Module D1 D2 C1 C2 ESD ESD 100uF 1uF Smart Wi-Fi Module Series SC20-WL Hardware Design 3.9. USB Interface SC20-WL contains one integrated Universal Serial Bus (USB) interface which complies with the USB 2.0 specification and supports high speed (480 Mbps) and full speed (12 Mbps) modes. The USB interface is used for AT command communication, data transmission, software debugging and firmware upgrade. The following table shows the pin definition of USB interface. Table 6: Pin Definition of USB Interface Pin Name Pin No. I/O Description USB_VBUS 141, 142 PI USB power supply Comment 4.35V~6.3V Typical 5.0V USB_DM USB_DP USB_ID 13 14 16 IO IO AI USB differential data bus (minus) USB differential data bus (plus) Require differential impedance of 90 USB ID detection High level by default USB_VBUS can be powered by USB power or adapter. It can also be used for detecting USB connection, as well as for battery charging via the internal PMU. The input voltage of power supply ranges from 4.35 to 6.3V, and the typical value is 5.0V. SC20-WL module supports charging management for a single Li-ion battery, but varied charging parameters should be set for batteries with varied models or capacities. The module is available a built-in linear-charging circuit which supports maximally 1.44A charging current. The following are two USB interface reference designs for customers to choose from. Figure 13: USB Interface Reference Design (OTG is not Supported) SC20-WL_Hardware_Design 37 / 81 USB_VUSB USB_DM USB_DP Module C1 D1 D2 D3 100nF ESD ESD ESD 89 D N G D N G 1 2 3 4 5 VUSB USB_DM USB_DP USB_ID GND D N G D N G 6 7 Smart Wi-Fi Module Series SC20-WL Hardware Design Figure 14: USB Interface Reference Design (OTG is Supported) SC20-WL supports OTG protocol. If OTG function is needed, please refer to the above figure for the reference design. AW3605DNR is a high efficiency DC-DC chip manufactured by AWINIC, and users can choose according to their own demands. In order to ensure USB performance, please comply with the following principles while designing USB interface. It is important to route the USB signal traces as differential pairs with total grounding. The impedance of USB differential trace is 90. Keep the ESD protection devices as close as possible to the USB connector. Pay attention to the influence of junction capacitance of ESD protection devices on USB data lines. Typically, the capacitance value should be less than 2pF. Do not route signal traces under crystals, oscillators, magnetic devices and RF signal traces. It is important to route the USB differential traces in inner-layer with ground shielding on not only upper and lower layers but also right and left sides. Make sure the trace length difference between USB_DM and USB_DP is not exceeding 6.6mm. Table 7: USB Trace Length inside the Module Pin 13 14 Signal Length (mm) Length Difference (DP-DM) USB_DM USB_DP 29.43 29.36
-0.07 SC20-WL_Hardware_Design 38 / 81 VBAT L1 1.0uH C1 10uF 7 8 6 VOUT VOUT NC 4 5 1 SW VIN EN AW3605DNR D N G A D N G P D N G P U1 2 93 R1 10K D5 C2 22uF/
10V VBAT GPIO USB_VUSB USB_DM USB_DP USB_ID Module C3 D1 D2 D3 D4 100nF ESD ESD ESD ESD 89 D N G D N G 1 2 3 4 5 VUSB USB_DM USB_DP USB_ID GND D N G D N G 6 7 Smart Wi-Fi Module Series SC20-WL Hardware Design 3.10. UART Interfaces The module provides two UART interfaces:
UART1: 4-wire UART interface which supports hardware flow control UART2: 2-wire UART interfaces and is used for debugging Table 8: Pin Description of UART Interfaces Pin Name Pin No I/O Description Comment UART1_TXD 34 DO UART1 transmit data UART1_RXD 35 UART1 receive data UART1_CTS 36 UART1 clear to send UART1_RTS 37 UART1 request to send 1.8V power domain. If it is unused, keep it open. 1.8V power domain. If it is unused, keep it open. 1.8V power domain. If it is unused, keep it open. 1.8V power domain. If it is unused, keep it open. UART2_RXD 93 UART2_TXD 94 UART2 receive data. Debug port by default. 1.8V power domain. If it is unused, keep it open. UART2 transmit data. Debug port by default. 1.8V power domain. If it is unused, keep it open. DI DI DO DI DO UART1 provides 1.8V logic level. A level translator should be used if customers application is equipped with a 3.3V UART interface. A level translator TXS0104EPWR provided by Texas Instruments is recommended. The following figure shows the reference design. Figure 15: Reference Circuit with Level Translator Chip (for UART1) SC20-WL_Hardware_Design 39 / 81 LDO5_1V8 VCCA VCCB VDD_3.3V C1 100pF U1 GND C2 100pF UART1_CTS UART1_RTS UART1_TXD UART1_RXD OE A1 A2 A3 A4 TXS0104EPWR B1 B2 B3 B4 CTS_3.3V RTS_3.3V TXD_3.3V RXD_3.3V Smart Wi-Fi Module Series SC20-WL Hardware Design The following figure is an example of connection between SC20-WL and PC. A voltage level translator and a RS-232 level translator chip are also recommended to be added between the module and PC, as these two UART interfaces do not support the RS-232 level, while support the 1.8V CMOS level only. Figure 16: RS232 Level Match Circuit (for UART1) NOTE UART2 is similar to UART1. Please refer to UART1 reference circuit designs for UART2s. 3.11. SD Card Interface SC20-WL module supports SD cards with 4-bit data interfaces or SDIO devices. The pin definition of the SD card interface is shown below. Table 9: Pin Definition of SD Card Interface Pin Name Pin No. I/O Description Comment SD_LDO11 38 PO Power supply for SD card Vnorm=2.95V IOmax=600mA SD_LDO12 32 PO SD_CLK 39 DO 1.8V/2.95V output power supply Support 1.8V or 2.95V power supply. The maximum drive current is 50mA. High speed digital clock signal of SD card Control characteristic impedance as 50. SC20-WL_Hardware_Design 40 / 81 1.8V 3.3V OE VCCA TXD_1.8V RTS_1.8V VCCB TXD_3.3V RTS_3.3V UART1_TXD UART1_RTS UART1_RXD UART1_CTS RXD_1.8V CTS_1.8V RXD_3.3V CTS_3.3V GND GND VCC DIN1 DIN2 DIN3 DIN4 DIN5 ROUT1B ROUT1 ROUT2 ROUT3 GND DOUT1 DOUT2 DOUT3 DOUT4 DOUT5 RIN1 RIN2 RIN3 GND RXD CTS TXD RTS 3.3V FORCEON
/FORCEOFF
/INVALID Module TXS0104EPWR SN65C3238 DB-9 Smart Wi-Fi Module Series SC20-WL Hardware Design SD_CMD 40 I/O Command signal of SD card SD_DATA0 41 SD_DATA1 42 SD_DATA2 43 SD_DATA3 44 I/O I/O I/O I/O High speed bidirectional digital signal lines of SD card SD_DET 45 DI SD card insertion detection Active low A reference circuit for SD card interface is shown as below. Figure 17: Reference Circuit for SD Card Interface SD_LDO11 is a peripheral driver power supply for SD card. The maximum drive current is approx. 600mA. Because of the high drive current, it is recommended that the trace width is 0.5mm or more. In order to ensure the stability of drive power, a 2.2uF capacitor should be added in parallel near the SD card connector. CMD, CLK, DATA0, DATA1, DATA2 and DATA3 are all high-speed signal lines. In PCB design, please control the characteristic impedance of them as 50, and do not cross with other traces. It is recommended to route the trace on the inner layer of PCB, and keep the same trace length for CLK, CMD, DATA0, DATA1, DATA2 and DATA3. CLK additionally needs ground shielding. Layout guidelines:
Control impedance as 5010%, and ground shielding is required. The total trace length difference between CLK and other SC20-WL_Hardware_Design 41 / 81 120K 33R 33R 33R R7 R8 R9 R10 33R R11 R12 R13 33R 33R 1K SD_DATA2 SD_DATA3 SD_CMD SD_CLK SD_DATA0 SD_DATA1 SD_DET Module LDO5_1V8 SD_LDO12 SD_LDO11 R1 R2 R3 R4 R5 R6 NM_51K NM_51K NM_10K NM_51K NM_51K D1 D2 D3 D4 D5 D6 D7 D8 C1 2.2uF 1 2 3 4 5 6 7 8 9 P1-DAT2 P2-CD/DAT3 P3-CMD P4-VDD P5-CLK P6-VSS P7-DAT0 P8-DAT1 DETECTIVE 10 11 12 13 GND GND GND GND SD card connector 39 40 41 42 43 44 30 31 33 34 35 36 37 45 46 Smart Wi-Fi Module Series SC20-WL Hardware Design signal line traces should not exceed 1mm. Table 10: SDIO Trace Length Inside the Module Pin No. Signal Length (mm) Comment SD_CLK SD_CMD SD_DATA0 SD_DATA1 SD_DATA2 SD_DATA3 14.60 14.55 14.53 14.56 14.53 14.57 3.12. GPIO Interfaces SC20-WL has abundant GPIO interfaces with power domain of 1.8V. The pin definition is listed below. Table 11: Pin Definition of GPIO Interfaces PIN Pin Name GPIO Default State Comment TP_INT GPIO_13 B-PD: nppukp Wakeup TP_RST GPIO_12 B-PD: nppukp Wakeup GPIO_23 GPIO_23 B-PD: nppukp UART1_TXD GPIO_20 B-PD: nppukp Wakeup UART1_RXD GPIO_21 B-PD: nppukp UART1_RX Wakeup UART1_CTS GPIO_111 B-PD: nppukp Wakeup UART1_RTS GPIO_112 B-PD: nppukp Wakeup SD_DET GPIO_38 B-PD: nppukp Wakeup USB_BOOT GPIO_37 B-PD: nppukp Wakeup SC20-WL_Hardware_Design 42 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design TP_I2C_SCL GPIO_19 B-PD: nppukp TP_I2C_SDA GPIO_18 B-PD: nppukp LCD_RST GPIO_25 B-PD: nppukp Wakeup LCD_TE GPIO_24 B-PD: nppukp CAM0_CLK GPIO_26 B-PD: nppukp CAM1_CLK GPIO_27 B-PD: nppukp CAM0_RST GPIO_35 B-PD: nppukp Wakeup CAM0_PWD GPIO_34 B-PD: nppukp Wakeup CAM1_RST GPIO_28 B-PD: nppukp Wakeup CAM1_PWD GPIO_33 B-PD: nppukp CAM_I2C_SCL GPIO_30 B-PD: nppukp CAM_I2C_SDA GPIO_29 B-PD: nppukp GPIO_32 GPIO_32 B-PD: nppukp SENSOR_I2C_SCL GPIO_7 B-PD: nppukp SENSOR_I2C_SDA GPIO_6 B-PD: nppukp UART2_RXD GPIO_5 B-PD: nppukp Wakeup UART2_TXD GPIO_4 B-PD: nppukp KEY_VOL_UP GPIO_90 B-PD: nppukp Wakeup KEY_VOL_DOWN GPIO_91 B-PD: nppukp Wakeup GPIO_31 GPIO_31 B-PD: nppukp Wakeup GPIO_92 GPIO_92 B-PD: nppukp Wakeup 47 48 49 50 74 75 79 80 81 82 83 84 90 91 92 93 94 95 96 97 98 99 GPIO_88 1) GPIO_88 B-PD: nppukp 100 GPIO_89 GPIO_89 B-PD: nppukp 101 GPIO_69 GPIO_69 B-PD: nppukp 102 GPIO_68 1) GPIO_68 B-PD: nppukp SC20-WL_Hardware_Design 43 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 103 GPIO_97 GPIO_97 B-PD: nppukp Wakeup 104 GPIO_110 GPIO_110 B-PD: nppukp Wakeup 105 GPIO_0 GPIO_0 B-PD: nppukp 106 GPIO_98 GPIO_98 B-PD: nppukp Wakeup 107 GPIO_94 GPIO_94 B-PD: nppukp Wakeup 108 GPIO_36 GPIO_36 B-PD: nppukp Wakeup 109 GPIO_65 GPIO_65 B-PD: nppukp Wakeup 110 GPIO_96 GPIO_96 B-PD: nppukp Wakeup 112 GPIO_58 GPIO_58 B-PD: nppukp Wakeup 113 GPIO_99 GPIO_99 B-PD: nppukp 115 GPIO_95 GPIO_95 B-PD: nppukp Wakeup 116 GPIO_11 GPIO_11 B-PD: nppukp Wakeup 117 GPIO_10 GPIO_10 B-PD: nppukp 118 GPIO_9 GPIO_9 B-PD: nppukp 119 GPIO_8 GPIO_8 B-PD: nppukp 123 GPIO_16 GPIO_16 B-PD: nppukp 124 GPIO_17 GPIO_17 B-PD: nppukp NOTES start-up. followed by a colon (:) 3.13. SPI Interface 1) GPIO_68 and GPIO_88 cannot be pulled up during Wakeup: interrupt pins that can wake up the system B: Bidirectional digital with CMOS input PD: nppukp = default pulldown with programmable options, SC20-WL_Hardware_Design 44 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design SC20-WL provides one SPI interface multiplexed from GPIO interfaces. The interface only supports the master mode. Table 12: Pin Definition of SPI Interface Pin Name Pin No I/O Comment Description GPIO_8 119 GPIO_9 118 IO IO GPIO_10 117 DO GPIO_11 116 DO GPIO by default. Can be multiplexed into SPI_MOSI. GPIO by default. Can be multiplexed into SPI_MISO. GPIO by default. Can be multiplexed into SPI_CS_N. GPIO by default. Can be multiplexed into SPI_CLK. Master out slave in of SPI Master in slave out of SPI SPI chip select SPI clock 3.14. I2C Interfaces SC20-WL provides 3 groups of I2C interfaces which only support the master mode. As an open drain output, the I2C interfaces need a pull-up resistor on its external circuit, and the recommended logic level is 1.8V. Table 13: Pin Definition of I2C Interface Pin Name Pin No I/O Description Comment TP_I2C_SCL OD I2C clock signal of touch panel TP_I2C_SDA OD I2C data signal of touch panel CAM_I2C_SCL OD I2C clock signal of camera CAM_I2C_SDA OD I2C data signal of camera 47 48 83 84 SENSOR_I2C_SCL 91 OD I2C clock signal for external sensor SENSOR_I2C_SDA 92 OD I2C data signal for external sensor Used for touch panel Used for camera Used for external sensor SC20-WL_Hardware_Design 45 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 3.15. ADC Interfaces SC20-WL provides three analog-to-signal converter (ADC) interfaces, and the pin definition is shown below. Table 14: Pin Definition of ADC Interfaces Pin Name Pin No I/O Description Comment ADC 128 AI General purpose ADC Max input voltage is 1.7V VBAT_SNS 133 AI Input voltage sense Max input voltage is 4.5V VBAT_THERM 134 AI Battery temperature detection The resolution of the ADC is up to 16 bits and the effective resolution is 12 bits. Internal pull-up. Externally connect to GND with a 47K NTC thermistor. When the input voltage exceeds the maximum input voltage of VBAT_SNS pin, resistor divider cannot be used in the circuit design. Instead, general purpose ADC with resistor divider input can be used. NOTE 3.16. Motor Drive Interface The pin definition of motor drive interface is listed below. Table 15: Pin Definition of Motor Drive Interface Pin Name Pin No I/O Description Comment VIB_DRV 28 PO Motor drive Connected to the negative terminal of motor The motor is driven by an exclusive circuit, and a reference circuit design is shown below. SC20-WL_Hardware_Design 46 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Figure 18: Reference Circuit for Motor Connection When the motor stops, the redundant electricity can be discharged from the circuit loop formed by diodes, thus avoiding component damages. 3.17. LCM Interface SC20-WL module provides an LCM interface meeting MIPI DSI specification. The interface supports high speed differential data transmission, with up to four lanes and a transmission rate up to 1.5Gbps per lane. It supports maximally 720P resolution displays. Table 16: Pin Definition of LCM Interface Pin Name Pin No I/O Description Comment LDO6_1V8 125 PO LDO17_2V85 129 PO 1.8V output power supply for LCM logic circuit and DSI 2.85V output power supply for LCM analog circuits 1.8V normal voltage. Vnorm=1.8V IOmax=100mA 2.85V normal voltage. Vnorm=2.85V IOmax=300mA PWM LCD_RST LCD_TE 29 49 50 DO Adjust the backlight brightness. PWM control signal. DO LCD reset signal Active low DI LCD tearing effect signal SC20-WL_Hardware_Design 47 / 81 3V3 C1 1uF D1 C2 NM 1 VIB+
Motor 4 VIB-
VIB_DRV Module Smart Wi-Fi Module Series SC20-WL Hardware Design MIPI_DSI_CLKN 52 AO MIPI_DSI_CLKP 53 AO MIPI_DSI_LN0N 54 AO MIPI_DSI_LN0P 55 AO MIPI_DSI_LN1N 56 AO MIPI_DSI_LN1P 57 AO MIPI_DSI_LN2N 58 AO MIPI_DSI_LN2P 59 AO MIPI_DSI_LN3N 60 AO MIPI_DSI_LN3P 61 AO MIPI DSI clock signal
(negative) MIPI DSI clock signal
(positive) MIPI DSI data signal
(negative) MIPI DSI data signal
(positive) MIPI DSI data signal
(negative) MIPI DSI data signal
(positive) MIPI DSI data signal
(negative) MIPI DSI data signal
(positive) MIPI DSI data signal
(negative) MIPI DSI data signal
(positive) Four-lane MIPI DSI is needed for connection with 720P displays. The following is a reference circuit design, by taking the connection with LCM interface on LHR050H41-00 (IC: ILI9881C) from HUARUI Lighting as an example. SC20-WL_Hardware_Design 48 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Figure 19: Reference Circuit Design for LCM Interface MIPI are high speed signal lines. It is recommended that common-mode filters should be added in series near the LCM connector, so as to improve protection against electromagnetic radiation interference. ICMEF112P900MFR from ICT is recommended. When compatible design with other displays is required, please connect the LCD_ID pin of LCM to the modules ADC pin, and please note that the output voltage of LCD_ID cannot exceed the voltage range of ADC pin. Backlight driving circuit needs to be designed for LCM, and a reference circuit design is shown in the following figure. Backlight brightness adjustment can be realized by PWM pin of SC20-WL module through adjusting the duty ratio. SC20-WL_Hardware_Design 49 / 81 LDO17_2V85 LDO6_1V8 LCM_LED+
LCM_LED-
C1 C2 4.7uF 100nF C3 1uF LCD_TE LCD_RST Module MIPI_DSI_LN3P MIPI_DSI_LN3N MIPI_DSI_LN2P MIPI_DSI_LN2N MIPI_DSI_LN1P MIPI_DSI_LN1N MIPI_DSI_LN0P MIPI_DSI_LN0N MIPI_DSI_CLKP MIPI_DSI_CLKN FL1 3 FL2 FL3 FL4 FL5 4 3 4 3 4 3 4 3 4 1 2 1 2 1 2 1 2 1 2 5 6 5 6 5 6 5 6 5 6 EMI filter 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 LEDA NC LEDK NC LPTE RESET LCD_ID NC(SDA-TP) NC(SCL-TP) NC(RST-TP) NC(EINT-TP) GND VIO18 VCC28 NC(VTP-TP) GND MIPI_TDP3 MIPI_TDN3 GND MIPI_TDP2 MIPI_TDN2 GND MIPI_TDP1 MIPI_TDN1 GND MIPI_TDP0 MIPI_TDN0 GND MIPI_TCP MIPI_TCN LCM Smart Wi-Fi Module Series SC20-WL Hardware Design Figure 20: Reference Design for Backlight Dirving Circuit 3.18. Touch Panel Interface SC20-WL provides a set of I2C interface for connection with Touch Panel (TP), and also provides the corresponding power supply and interrupt pins. The definition of TP interface pins is illustrated below. Table 17: Pin Definition of Touch Panel Interface Pin Name Pin No I/O Description Comment LDO6_1V8 125 PO LDO17_2V85 129 PO 1.8V output power supply for TP I/O power Pull-up power supply of I2C. 1.8V normal voltage. 2.85V output power supply for TP VDD power TP power supply. 2.85V normal voltage. TP_INT TP_RST DI Interrupt signal of TP DO Reset signal of TP Active low 30 31 47 48 TP_I2C_SCL OD I2C clock signal of TP TP_I2C_SDA OD I2C data signal of TP SC20-WL_Hardware_Design 50 / 81 VBAT 29 PWM Module C1 2.2uF Backlight driving circuit LCM_LED+
LCM_LED-
Smart Wi-Fi Module Series SC20-WL Hardware Design The following illustrates a TP interface reference circuit, by taking the connection with TP interface on LHR050H41-00 (IC: GT9147) from HUARUI Lighting as an example. Figure 21: Reference Circuit Design for TP Interface 3.19. Camera Interfaces Based on standard MIPI CSI video input interface, SC20-WL module supports two cameras, and the maximum pixel of the rear camera can be up to 8MP. The video and photo quality is determined by various factors such as the camera sensor, camera lens quality, etc. It is recommended to select a proper camera model, according to the specification of cameras verified and recommended by Quectel. The following models of camera sensors have been verified by Quectel:
For rear camera: Hi843 of SK Hynix, T4KA3 of TOSHIBA For front camera: Hi259 of SK Hynix, SP2508 of SuperPix 3.19.1. Rear Camera Interface The rear camera realizes transmission and control via its FPC and a connector which is connected to the module. SC20-WL rear camera interface integrates a two-lane MIPI CSI for differential data transmission, and it maximally supports 8MP cameras. The pin definition of rear camera interface is shown below. SC20-WL_Hardware_Design 51 / 81 LDO6_1V8 LDO17_2V85 R1 2.2K R2 2.2K 1 2 3 4 5 6 SDA 1.8V SCL 1.8V RESET 1.8V INT 1.8V GND VDD 2.8V TP D1 D2 D3 D4 C1 C2 D5 4.7uF 100nF TP_I2C_SDA TP_I2C_SCL TP_RST TP_INT Module Smart Wi-Fi Module Series SC20-WL Hardware Design Table 18: Pin Definition of Rear Camera Interface Pin Name Pin No I/O Description Comment LDO6_1V8 125 PO LDO17_2V85 129 PO 1.8V output power supply for DOVDD of camera 2.85V output power supply for auto focus circuit and AVDD of camera 1.8V normal voltage. Vnorm=1.8V IOmax=100mA 2.85V normal voltage. Vnorm=2.85V IOmax=300mA MIPI_CSI0_CLKN 63 MIPI_CSI0_CLKP 64 MIPI_CSI0_LN0N 65 MIPI_CSI0_LN0P 66 MIPI_CSI0_LN1N 67 MIPI_CSI0_LN1P 68 AI AI AI AI AI AI MIPI CSI clock signal
(negative) MIPI CSI clock signal
(positive) MIPI CSI data signal
(negative) MIPI CSI data signal
(positive) MIPI CSI data signal
(negative) MIPI CSI data signal
(positive) CAM0_MCLK DO Clock signal of rear camera CAM0_RST DO Reset signal of rear camera CAM0_PWD DO Power down signal of rear camera CAM_I2C_SCL OD I2C clock signal of camera CAM_I2C_SDA OD I2C data signal of camera 74 79 80 83 84 The following is a reference circuit design for rear camera interface, by taking the connection with T4KA3 camera as an example. SC20-WL_Hardware_Design 52 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Figure 22: Reference Circuit Design for Rear Camera Interface NOTE DVDD_1V2 is used to power the rear camera core, and VDD_AF_2V8 is used to power the rear camera AF circuit. Both of them are powered by an external LDO. 3.19.2. Front Camera Interface The front camera interface integrates a differential data interface meeting one-lane MIPI CSI standard, and is tested to support 2MP cameras. The pin definition of rear camera interface is shown below. Table 19: Pin Definition of Front Camera Interface Pin Name Pin No I/O Description Comment LDO6_1V8 125 PO 1.8V output power supply for DOVDD of camera 1.8V normal voltage. Vnorm=1.8V SC20-WL_Hardware_Design 53 / 81 DVDD_1V2 LDO6_1V8 VDD_AF_2V8 C1 C2 C3 1uF 1uF 100nF R1 R2 2.2K 2.2K FL1 1 2 5 6 EMI Filter 3 4 3 4 3 4 FL2 2 FL3 1 1 2 5 6 5 6 EMI Filter DVDD_1V2 NC AF_VDD2V8 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 DGND NC NC NC GND MDP2 MDN2 GND SIOD SIOC RESET GND DGND MCP MCN MDP1 MDN1 DGND NC XCLK LDO17_2V85 LDO6_1V8 AVDD_2V8 DOVDD1V8 R3 R4 0R_NM 0R Rear Camera MIPI_CSI0_LN1P MIPI_CSI0_LN1N CAM_I2C_SDA CAM_I2C_SCL CAM0_RST MIPI_CSI0_CLKP MIPI_CSI0_CLKN MIPI_CSI0_LN0P MIPI_CSI0_LN0N CAM0_PWD CAM0_MCLK Module Smart Wi-Fi Module Series SC20-WL Hardware Design IOmax=100mA 2.85V normal voltage. Vnorm=2.85V IOmax=300mA LDO17_2V85 129 PO 2.85V output power supply for AVDD of camera MIPI_CSI1_CLKN 70 MIPI_CSI1_CLKP 71 MIPI_CSI1_LN0N 72 MIPI_CSI1_LN0P 73 CAM1_MCLK CAM1_RST CAM1_PWD CAM_I2C_SCL CAM_I2C_SDA 75 81 82 83 84 AI AI AI AI DO DO DO OD OD MIPI CSI clock signal
(negative) MIPI CSI clock signal
(positive) MIPI CSI data signal
(negative) MIPI CSI data signal
(positive) Clock signal of front camera Reset signal of front camera Power down signal of front camera I2C clock signal of camera I2C data signal of camera The following is a reference circuit design for front camera interface, by taking the connection with SP2508 camera as an example. Figure 23: Reference Circuit Design for Front Camera Interface SC20-WL_Hardware_Design 54 / 81 MIPI_CSI1_CLKP MIPI_CSI1_CLKN MIPI_CSI1_LN0P MIPI_CSI1_LN0N CAM1_MCLK CAM_I2C_SCL CAM_I2C_SDA CAM1_PWD CAM1_RST Module FL1 FL2 3 4 3 4 1 2 1 2 5 6 5 6 EMI Filter R3 0R LDO6_1V8 R1 2.2K R2 2.2K LDO17_2V85 LDO6_1V8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 DGND DGND CLKP CLKN DGND DGND MDP0 MDN0 DGND DGND NC(MDP1) NC(MDN1) DGND DGND MCLK DGND SCL SDA PWDN RST AVDD2V8 AGND DGND DOVDD1V8 NC C1 C2 C3 C4 2.2uF 100nF 1uF 100nF Front Camera Smart Wi-Fi Module Series SC20-WL Hardware Design 3.19.3. Design Considerations Special attention should be paid to the definition of video device interface in schematic design. Different video devices will have varied definitions for their corresponding connectors. Assure the device and the connectors are correctly connected. MIPI are high speed signal lines, supporting maximum data rate up to 1.5Gbps. The differential impedance should be controlled as 100. Additionally, it is recommended to route the trace on the inner layer of PCB, and do not cross it with other traces. For the same video device, all the MIPI traces should keep the same length. In order to avoid crosstalk, a distance of 1.5 times of the trace width is recommended to be maintained among MIPI signal lines. During impedance matching, do not connect GND on different planes so as to ensure impedance consistency. It is recommended to select a low capacitance TVS for ESD protection and the recommended parasitic capacitance is below 1pF. Route MIPI traces according to the following rules:
a) The total trace length should not exceed 305mm;
b) Control the differential impedance as 10010%;
c) Control intra-lane length difference within 0.67mm;
d) Control inter-lane length difference within 1.3mm. Table 20: MIPI Trace Length inside the Module PIN Pin Name Length (mm) Length Difference (P-N) 52 53 54 55 56 57 58 59 60 61 63 64 MIPI_DSI_CLKN MIPI_DSI_CLKP MIPI_DSI_LN0N MIPI_DSI_LN0P MIPI_DSI_LN1N MIPI_DSI_LN1P MIPI_DSI_LN2N MIPI_DSI_LN2P MIPI_DSI_LN3N 7.08 6.45 6.15 5.85 6.64 6.60 8.20 8.94 9.28 MIPI_DSI_LN3P 10.24 MIPI_CSI0_CLKN 10.55 MIPI_CSI0_CLKP 11.09
-0.63
-0.30
-0.04 0.74 0.96 0.54 SC20-WL_Hardware_Design 55 / 81 65 66 67 68 70 71 72 73 Smart Wi-Fi Module Series SC20-WL Hardware Design MIPI_CSI0_LN0N 12.13 MIPI_CSI0_LN0P 12.53 MIPI_CSI0_LN1N 13.73 MIPI_CSI0_LN1P 14.49 MIPI_CSI1_CLKN 17.32 MIPI_CSI1_CLKP 17.45 MIPI_CSI1_LN0N 18.89 MIPI_CSI1_LN0P 19.24 0.40 0.76 0.13 0.35 3.20. Sensor Interfaces SC20-WL module supports communication with sensors via I2C interface, and it supports ALS/PS, compass, G-sensor, and gyroscopic sensors. Verified sensor models by Quectel include: BST-BMA223, STK3311-WV, MPU-6881 and MMC35240PJ. Table 21: Pin Definition of Sensor Interfaces Pin Name Pin No I/O Description Comment SENSOR_I2C_SCL 91 OD I2C clock signal for external sensor SENSOR_I2C_SDA 92 OD I2C data signal for external sensor GPIO_88 GPIO_89 GPIO_94 GPIO_36 GPIO_65 GPIO_96 99 100 107 108 109 110 DI DI DI DI DI DI Gyroscope sensor interrupt signal 2 Gyroscope sensor interrupt signal 1 Proximity sensor interrupt signal Compass sensor interrupt signal Default configuration;
include but not limited to these GPIO pins. Gravity sensor interrupt signal 2 Gravity sensor interrupt signal 1 SC20-WL_Hardware_Design 56 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 3.21. Audio Interfaces SC20-WL module provides two analog input channels and three analog output channels. The following table shows the pin definition. Table 22: Pin Definition of Audio Interfaces Pin Name Pin No I/O Description Comment MIC1P AI Microphone positive input for channel 1 MIC_GND MIC reference ground AI Microphone positive input for channel 2 4 5 6 8 9 10 11 MIC2P EARP EARN SPKP SPKN AO Earpiece positive output AO Earpiece negative output AO Speaker positive output AO Speaker negative output HPH_R 136 AO Headphone right channel output HPH_GND 137 Headphone virtual ground HPH_L 138 AO Headphone left channel output HS_DET 139 AI Headset insertion detection High level by default The module offers two audio input channels which are both single-ended channels. The earpiece interface uses differential output. The loudspeaker interface uses differential output as well. The output channel is available with a Class-D amplifier whose output power is 879mW when VBAT is 4.2V and load is 8. The headphone interface features stereo left and right channel output, and headphone insert detection function is supported. SC20-WL_Hardware_Design 57 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 3.21.1. Reference Circuit Design for Microphone Figure 24: Reference Circuit Design for Microphone Interface 3.21.2. Reference Circuit Design for Receiver Interface Figure 25: Reference Circuit Design for Receiver Interface SC20-WL_Hardware_Design 58 / 81 MIC1P MIC_GND Module F1 0R F2 0R C1 NC MIC D1 C3 100pF EARP EARN Module C2 NM C1 NM C3 NM F1 0R F2 0R D1 D2 Smart Wi-Fi Module Series SC20-WL Hardware Design 3.21.3. Reference Circuit Design for Headphone Interface Figure 26: Reference Circuit Design for Headphone Interface 3.21.4. Reference Circuit Design for Loudspeaker Interface Figure 27: Reference Circuit Design for Loudspeaker Interface 3.21.5. Audio Interface Design Considerations It is recommended to use the electret microphone. In order to decrease radio or other signal interference, the position of RF antenna should be kept away from audio interface and audio trace. Power trace cannot be parallel with audio trace and also should be far away from the audio trace. The differential audio traces must be routed according to the differential signal layout rule. SC20-WL_Hardware_Design 59 / 81 C1 NM C2 NM R1 0R R3 0R R4 20K F4 0R MIC_GND MIC2P HPH_L HS_DET HPH_R HPH_GND Module R2 0R F1 F2 0R 0R F3 0R C3 C4 C5 NM NM NM D1 D2 D3 D4 ESD 1 5 4 6 3 2 F1 0R F2 0R SPKP EARP SPKN EARN Module D1 D2 C1 NM C2 NM Smart Wi-Fi Module Series SC20-WL Hardware Design 3.22. Emergency Download Interface USB_BOOT is an emergency download interface. Pull up to LDO5_1V8 during power-up will force the module enter into emergency download mode. This is an emergency option when there are failures such as abnormal startup or running. For convenient firmware upgrade and debugging in the future, please reverse this pin. The reference circuit design is shown as below. Figure 28: Reference Circuit Design for Emergency Download Interface SC20-WL_Hardware_Design 60 / 81 USB_BOOT Module LDO5_1V8 S1 D1 R1 10K Smart Wi-Fi Module Series SC20-WL Hardware Design 4 Wi-Fi and BT SC20-WL module provides a shared antenna interface ANT_WIFI/BT for Wi-Fi and Bluetooth (BT) functions. The interface impedance is 50. External antennas such as PCB antenna and ceramic antenna can be connected to the module via the interface, so as to achieve Wi-Fi and BT functions. 4.1. Wi-Fi Overview SC20-WL series module supports 2.4GHz/5GHz double-bands WLAN wireless communication based on IEEE 802.11a/b/g/n standard protocols. The maximum data rate is up to 150 Mbps. The features are as below:
Support Wake-on-WLAN (WoWLAN) Support ad hoc mode Support WAPI SMS4 hardware encryption Support AP mode Support Wi-Fi Direct Support MCS 0-7 for HT20 and HT40 4.1.1. Wi-Fi Performance The following table lists the Wi-Fi transmitting and receiving performance of SC20-WL module. Table 23: Wi-Fi Transmitting Performance Standard Data Rate Output Power 2.4GHz 802.11g 802.11b 802.11b 802.11g 1Mbps 11Mbps 6Mbps 54Mbps 16dBm2.5dBm 16dBm2.5dBm 16dBm2.5dBm 14dBm2.5dBm 802.11n HT20 MCS0 15dBm2.5dBm SC20-WL_Hardware_Design 61 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Table 24: Wi-Fi Receiving Performance Standard Data Rate Sensitivity 5GHz 2.4GHz 802.11n HT20 802.11n HT40 802.11n HT40 802.11a 802.11a 802.11n HT20 802.11n HT20 802.11n HT40 802.11n HT40 802.11b 802.11b 802.11g 802.11g 802.11n HT20 802.11n HT20 802.11n HT40 802.11n HT40 802.11a 802.11a 802.11n HT20 802.11n HT40 MCS7 MCS0 MCS7 6Mbps 54Mbps MCS0 MCS7 MCS0 MCS7 1Mbps 11Mbps 6Mbps 54Mbps MCS0 MCS7 MCS0 MCS7 6Mbps 54Mbps MCS0 MCS7 MCS0 5GHz 802.11n HT20 13dBm2.5dBm 14dBm2.5dBm 13dBm2.5dBm 15dBm2.5dBm 13dBm2.5dBm 14dBm2.5dBm 12dBm2.5dBm 14dBm2.5dBm 12dBm2.5dBm
-96dBm
-87dBm
-91dBm
-74dBm
-90dBm
-72dBm
-87dBm
-68dBm
-90dBm
-71dBm
-88dBm
-69dBm
-86dBm SC20-WL_Hardware_Design 62 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 802.11n HT40 MCS7
-66dBm Referenced specifications are listed below:
IEEE 802.11n WLAN MAC and PHY, October 2009 + IEEE 802.11-2007 WLAN MAC and PHY, June 2007 IEEE Std 802.11b, IEEE Std 802.11d, IEEE Std 802.11e, IEEE Std 802.11g, IEEE Std 802.11i: IEEE 802.11-2007 WLAN MAC and PHY, June 2007 4.2. BT Overview SC20-WL module supports BT4.2 (BR/EDR+BLE) specification, as well as GFSK, 8-DPSK, /4-DQPSK modulation modes. Maximally support up to 7 wireless connections. Maximally support up to 3.5 piconets at the same time. Support one SCO (Synchronous Connection Oriented) or eSCO connection. The BR/EDR channel bandwidth is 1MHz, and can accommodate 79 channels. The BLE channel bandwidth is 2MHz, and can accommodate 40 channels. Table 25: BT Data Rate and Version Version Data rate Maximum Application Throughput Comment 1.2 1 Mbit/s
> 80 Kbit/s 2.0 + EDR 3 Mbit/s
> 80 Kbit/s 3.0 + HS 24 Mbit/s Reference 3.0 + HS 4.0 24 Mbit/s Reference 4.0 LE Referenced specifications are listed below:
Bluetooth Radio Frequency TSS and TP Specification 1.2/2.0/2.0 + EDR/2.1/2.1+ EDR/3.0/3.0 + HS, August 6, 2009 Bluetooth Low Energy RF PHY Test Specification, RF-PHY.TS/4.0.0, December 15, 2009 SC20-WL_Hardware_Design 63 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 4.2.1. BT Performance The following table lists the BT transmitting and receiving performance of SC20-WL module. Table 26: BT Transmitting and Receiving Performance Transmitter Performance Packet Types DH5 2-DH5 3-DH5 Transmitting Power 10dBm2.5dBm 8dBm2.5dBm 8dBm2.5dBm Receiver Performance Packet Types DH5 Receiving Sensitivity
-93dBm 2-DH5
-92dBm 3-DH5
-86dBm SC20-WL_Hardware_Design 64 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 5 Antenna Interface SC20-WL antenna interface includes a Wi-Fi/BT antenna. The antenna interface has an impedance of 50. 5.1. Wi-Fi/BT Antenna Interface The following tables show the Wi-Fi/BT antenna pins definition and frequency specification. Table 27: Pin Definition of Wi-Fi/BT Antenna Pin Name Pin No. Description Comment ANT_WIFI/BT 77 Wi-Fi/BT antenna 50 impedance Table 28: Wi-Fi/BT Frequency Type 802.11a/b/g/n/ac BT4.2 LE I/O IO Frequency 2402~2482 5180~5825 2402~2480 Unit MHz MHz A reference circuit design for Wi-Fi/BT antenna is shown as below. R1, C1 and C2 are mounted according to the actual debugging. C1 and C2 are not mounted and a 0 resistor is mounted on R1 by default. Figure 29: Reference Circuit Design for Wi-Fi/BT Anternna SC20-WL_Hardware_Design 65 / 81 R1 0R 2.4Ghz/
5Ghz antenna C1 NM C2 NM ANT_WIFI/BT Module Smart Wi-Fi Module Series SC20-WL Hardware Design NOTE Place the -type matching components (R1, C1, C2) as close to the antenna as possible. 5.1.1. Reference Design of RF Layout For users PCB, the characteristic impedance of all RF traces should be controlled to 50. The impedance of the RF traces is usually determined by the trace width (W), the materials dielectric constant, height from the reference ground to the signal layer (H), and the clearance between RF traces and grounds (S). Microstrip or coplanar waveguide is typically used in RF layout to control characteristic impedance. The following are reference designs of microstrip or coplanar waveguide with different PCB structures. Figure 30: Microstrip Design on a 2-layer PCB Figure 31: Coplanar Waveguide Design on a 2-layer PCB SC20-WL_Hardware_Design 66 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Figure 32: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground) Figure 33: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground) In order to ensure RF performance and reliability, the following principles should be complied with in RF layout design:
Use an impedance simulation tool to accurately control the characteristic impedance of RF traces to 50. connected to ground. The GND pins adjacent to RF pins should not be designed as thermal relief pads, and should be fully The distance between the RF pins and the RF connector should be as short as possible, and all the right-angle traces should be changed to curved ones. There should be clearance under the signal pin of the antenna connector or solder joint. The reference ground of RF traces should be complete. Meanwhile, adding some ground vias around RF traces and the reference ground could help to improve RF performance. The distance between the ground vias and RF traces should be no less than two times as wide as RF signal traces (2*W). For more details about RF layout, please refer to document [3]. SC20-WL_Hardware_Design 67 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 5.2. Antenna Installation 5.2.1. Antenna Requirements The following table shows the requirements on Wi-Fi/BT antenna. Table 29: Antenna Requirements Type Requirements Wi-Fi/BT VSWR: 2 Gain (dBi): 1 Max Input Power (W): 50 Input Impedance (): 50 Polarization Type: Vertical Cable Insertion Loss: < 1dB 5.2.2. Recommended RF Connector for Antenna Installation If RF connector is used for antenna connection, it is recommended to use the U.FL-R-SMT connector provided by HIROSE. Figure 34: Dimensions of the U.FL-R-SMT Connector (Unit: mm) SC20-WL_Hardware_Design 68 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design U.FL-LP serial connector listed in the following figure can be used to match the U.FL-R-SMT. Figure 35: Mechanical Parameters of U.FL-LP Connectors The following figure describes the space factor of mated connectors. Figure 36: Space Factor of Mated Connectors (Unit: mm) For more details, please visit http://www.hirose.com. SC20-WL_Hardware_Design 69 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 6 Electrical, Reliability and Radio Characteristics 6.1. Absolute Maximum Ratings Absolute maximum ratings for power supply and voltage on digital and analog pins of the module are listed in the following table. Table 30: Absolute Maximum Ratings Parameter VBAT USB_VBUS Voltage on Digital Pins Min.
-0.5
-0.5
-0.3 Max. Unit 6 16 2.3 V V V 6.2. Power Supply Ratings Table 31: SC20-WL Module Power Supply Ratings Parameter Description Conditions Min. Typ. Max. Unit VBAT VBAT 3.5 3.8 4.2 V The actual input voltages must stay between the minimum and maximum values. USB_VBUS USB detection 4.35 5.0 6.3 V VRTC Power supply voltage of backup battery 2.0 3.0 3.25 V SC20-WL_Hardware_Design 70 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 6.3. Charging Performance Specifications Table 32: Charging Performance Specifications Parameter Min. Typ. Max. Unit Trickle charging-A current 81 90 99 mA Trickle charging-A threshold voltage range (15.62mV stepping up) 2.5 2.796 2.984 V Trickle charging-B threshold voltage range (18.75mV stepping up) 3.0 3.2 3.581 V Charge voltage range (25mV stepping up) 4 4.2 4.775 V Charge voltage accuracy Charge current accuracy Charge current range (90mA stepping up) 90 1440 mA
+/-2
+/-10 %
7 7.4
Charge termination current: when charge current is from 90 to 450mA Charge termination current: when charge current is from 450 to 1440mA 6.4. Operation and Storage Temperatures The operation temperature is listed in the following table. Table 33: Operation Temperature Parameter Min. Max. Unit Operation temperature range
-35 Extended temperature range
-40 Storage temperature range
-40 Typ.
+25
+65
+75 90 C C C SC20-WL_Hardware_Design 71 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Parameter Description Conditions Min. Typ. Max. Unit 6.5. Current Consumption Table 34: SC20-WL Current Consumption OFF state Power down Sleep state Idle state Wi-Fi 11b TX Wi-Fi 11g TX RF sleep RF idle
@1Mbps
@11Mbps
@6Mbps
@54Mbps IVBAT Wi-Fi 11n TX
@6.5Mbps 20Mhz
@65Mbps 20Mhz
@13.5Mbps 40Mhz
@135Mbps 40Mhz Wi-Fi 11b RX Wi-Fi 11g RX Wi-Fi 11n RX BT Tx Channel 0 BT Tx Channel 38 BT Tx Channel 78 BT Rx Channel 38 20 1.4 42.7 298 281 286 188 275 201 269 186 120 119 117 100 100 100 80 uA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA SC20-WL_Hardware_Design 72 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 6.6. Electrostatic Discharge The module is not protected against electrostatic discharge (ESD) in general. Consequently, it should be subject to ESD handling precautions that are typically applied to ESD sensitive components. Proper ESD handling and packaging procedures must be applied throughout the processing, handling and operation of any application that incorporates the module. The following table shows the electrostatic discharge characteristics of SC20-WL module. Table 35: ESD Characteristics (Temperature: 25C, Humidity: 45%) Tested Points Contact Discharge Air Discharge Unit VBAT, GND
+/-5 All Antenna Interfaces
+/-5 USB Interfaces
+/-2 Other Interfaces
+/-0.5
+/-10
+/-10
+/-4
+/-1 KV KV KV KV SC20-WL_Hardware_Design 73 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 7 Mechanical Dimensions This chapter describes the mechanical dimensions of the module. All dimensions are measured in millimeter (mm), and the tolerances for dimensions without tolerance values are 0.05mm. 7.1. Mechanical Dimensions of the Module Figure 37: Module Top and Side Dimensions SC20-WL_Hardware_Design 74 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Figure 38: Module Bottom Dimensions (Top View) SC20-WL_Hardware_Design 75 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 7.2. Recommended Footprint Figure 39: Recommended Footprint (Top View) NOTES on host PCB. 1. For easy maintenance of the module, keep about 3mm between the module and other components 2. All RESERVED pins should be kept open and MUST NOT be connected to ground. SC20-WL_Hardware_Design 76 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 7.3. Top and Bottom Views of the Module Figure 40: Top View of the Module NOTE Figure 41: Bottom View of the Module These are renderings of SC20-W module. For authentic dimension and appearance, please refer to the module that you received from Quectel. SC20-WL_Hardware_Design 77 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 8 Storage, Manufacturing and Packaging 8.1. Storage SC20-WL is stored in a vacuum-sealed bag. It is rated at MSL 3, and its storage restrictions are shown as below. 1. Shelf life in the vacuum-sealed bag: 12 months at <40C/90%RH. 2. After the vacuum-sealed bag is opened, devices that will be subjected to reflow soldering or other high temperature processes must be:
Mounted within 168 hours at the factory environment of 30C/60%RH. Stored at <10%RH. 3. Devices require baking before mounting, if any circumstance below occurs. When the ambient temperature is 23C5C and the humidity indication card shows the humidity is >10% before opening the vacuum-sealed bag. Device mounting cannot be finished within 168 hours at factory conditions of 30C/60%. If baking is required, devices may be baked for 8 hours at 120C5C. Plastic packages shall be removed from the modules prior to high temperature baking (120C). If shorter baking time is desired, please refer to IPC/JEDECJ-STD-033 for baking procedure. 4. 1. NOTE SC20-WL_Hardware_Design 78 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 8.2. Manufacturing and Soldering Push the squeegee blade to apply the solder paste on the surface of stencil, making the paste fill the stencil apertures and then letting it penetrate to the PCB. Downward squeegee pressure should be adjusted properly to ensure that the stencil is wiped clean without damaging the stencil. To ensure the module soldering quality, the recommended stencil thickness is 0.18mm~0.20 mm. As for LGA pads, less soldering paste volume is recommended to avoid short circuits. For more details, please refer to document [2]. It is suggested that the peak reflow temperature ranges from 240 to 245C (for SnAg3.0Cu0.5 alloy). The absolute maximum reflow temperature is 245C. To avoid damage to the module caused by repeated heating, remounting the module after finishing the reflow soldering of the first side of PCB is highly recommended. The recommended reflow soldering thermal profile is illustrated as follows. Factor Soak Zone Max slope Reflow Zone Figure 42: Recommended Reflow Soldering Thermal Profile Table 36: Recommended Thermal Profile Parameters Recommendation 1 to 3C/sec Soak time (between A and B: 150C and 200C) 60 to 120 sec SC20-WL_Hardware_Design 79 / 81 Temp. (C) 245 240 220 200 150 100 Soak Zone A Max slope: 1~3C/
sec Reflow Zone Max slope:
2~3C/sec C Cooling down slope:
1~4C/sec B D Smart Wi-Fi Module Series SC20-WL Hardware Design Max slope Reflow time (D: over 220C) Max temperature Cooling down slope Reflow Cycle Max reflow cycle 8.3. Packaging 2 to 3C/sec 40 to 60 sec 240C ~ 245C 1 to 4C/sec 1 SC20-WL is packaged in tape and reel carriers. Each reel is 12.32m long and contains 200 modules. The following figures show the package details, measured in mm. Figure 43: Tape Dimensions SC20-WL_Hardware_Design 80 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Figure 44: Reel Dimensions Table 37: Reel Packaging Model Name MOQ for MP Minimum Package: 200pcs Minimum Package4=800pcs SC20-WL 200 Size: 370mm 350mm 85mm N.W: 1.92kg G.W: 3.17kg Size: 380mm 365mm 365mm N.W: 7.68kg G.W: 13.63kg SC20-WL_Hardware_Design 81 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design 9 Appendix A References Table 38: Related Documents SN Document Name Remark
[1]
Quectel_Smart_EVB_User_Guide Smart EVB User Guide
[2]
Quectel_Module_Secondary_SMT_User_Guide Module Secondary SMT User Guide
[3]
Quectel_RF_Layout_Application_Note RF Layout Application Note Table 39: Terms and Abbreviations Abbreviation Description ADC AMR bps BT CS CTS EMMC ESD FR FPC GND HIC Analog-to-Digital Converter Adaptive Multi-rate Bits Per Second Bluetooth Coding Scheme Clear to Send Embedded Multi Media Card Electrostatic Discharge Full Rate Ground Flexible Printed Circuit Humidity Indicator Card SC20-WL_Hardware_Design 82 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design LPDDR Low Power Double Data Rate I/O LCD LCM MIPI MSL NTC OTG PC PCB PDA POS RF RH RHCP RTC Rx SAW SDIO SMD TP TV TVS TX USB Input/Output Liquid Crystal Display Liquid Crystal Module Mobile Industry Processor Interface Moisture Sensitivity Level Negative Temperature Coefficient On-The-Go Personal Computer Printed Circuit Board Personal Data Assistant Point Of Sales Radio Frequency Relative Humidity Right Hand Circularly Polarized Real Time Clock Receive Surface Acoustic Wave Secure Digital Input and Output Surface Mount Device Touch Panel Television Transient Voltage Suppressors Transmitting Direction Universal Serial Bus SC20-WL_Hardware_Design 83 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design Universal Asynchronous Receiver & Transmitter Maximum Voltage Value Normal Voltage Value Minimum Voltage Value Maximum Input High Level Voltage Value Minimum Input High Level Voltage Value Maximum Input Low Level Voltage Value Minimum Input Low Level Voltage Value Absolute Maximum Input Voltage Value Absolute Minimum Input Voltage Value Maximum Output High Level Voltage Value Minimum Output High Level Voltage Value Maximum Output Low Level Voltage Value Minimum Output Low Level Voltage Value Voltage of Real Time Clock Voltage Standing Wave Ratio Wireless Local Area Network Wireless Fidelity Wide Video Graphics Array UART Vmax Vnorm Vmin VIHmax VIHmin VILmax VILmin VImax VImin VOHmax VOHmin VOLmax VOLmin VRTC VSWR WLAN Wi-Fi WVGA SC20-WL_Hardware_Design 84 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design SC20-WL_Hardware_Design 85 / 81 Smart Wi-Fi Module Series SC20-WL Hardware Design SC20-WL_Hardware_Design 86 / 81
1 2 3 | Internal photos | Internal Photos | 323.74 KiB | January 03 2020 / July 04 2020 | delayed release |
1 2 3 | External photos | External Photos | 1.30 MiB | January 03 2020 / July 04 2020 | delayed release |
1 2 3 | Cover letter | Cover Letter(s) | 147.40 KiB | January 03 2020 / January 06 2020 |
Quectel Wireless Solutions Company Limited Building 5, Shanghai Business Park PhaseIII, (Area B),No.1016 Tianlin Road, Minhang District, Tel: +8602150086326 Ext: 800; Fax: +862153253668 Shanghai 200233 China Date: December 30, 2019 Federal Communications Commission Office of Engineering and Technology Laboratory Division 7435 Oakland Mills Rd Columbia MD 21046-1609 Attention: Application Examiner / Review Engineer Subject: Request for a Change in Identification per Section 2.933 of the FCC Rules To The Commission:
This change in identification request applies for a new FCC ID as established in 47 CFR 2.933(b) for a currently approved device. This application by Quectel Wireless Solutions Company Limited will establish a new FCC ID:
XMR201911SC20WL for the purpose of marketing. The original grant with FCC ID: XMR201709SC20W, will remain in effect. An authorization letter by Quectel Wireless Solutions Company Limited is attached. Per 2.933(b) 1.) The original identification is: FCC ID: XMR201709SC20W 2.) The original granted date is: 09/05/2017 3.) The equipment is electrically identical. 4.) The original test results are applicable and representative of this device 5.) FCC ID label, location info, External and Internal photos are included in this application. The following files are electronically submitted as attachments:
- Cover Letter
- ID Label and Location Info
- External and Internal photos
-Test reports
-User Manual Sincerely yours, Contact Person: Jean Hu Company: Quectel Wireless Solutions Company Limited TEL: +8602150086326 Ext: 800 FAX: +862153253668 E-mail: jean.hu@quectel.com
1 2 3 | Reference test setup | Test Setup Photos | 210.73 KiB | January 03 2020 / July 04 2020 | delayed release |
1 2 3 | Reference test setup DFS | Test Setup Photos | 272.26 KiB | January 03 2020 / July 04 2020 | delayed release |
frequency | equipment class | purpose | ||
---|---|---|---|---|
1 | 2020-01-06 | 2422 ~ 2452 | DTS - Digital Transmission System | Change in Identification |
2 | 2402 ~ 2480 | DSS - Part 15 Spread Spectrum Transmitter | ||
3 | 5755 ~ 5795 | NII - Unlicensed National Information Infrastructure TX |
app s | Applicant Information | |||||
---|---|---|---|---|---|---|
1 2 3 | Effective |
2020-01-06
|
||||
1 2 3 | Applicant's complete, legal business name |
Quectel Wireless Solutions Company Limited
|
||||
1 2 3 | FCC Registration Number (FRN) |
0018988279
|
||||
1 2 3 | Physical Address |
Building 5, Shanghai Business Park PhaseIII (Area B),No.1016 Tianlin Road, Minhang District
|
||||
1 2 3 |
Building 5, Shanghai Business Park PhaseIII
|
|||||
1 2 3 |
Shanghai
|
|||||
1 2 3 |
China
|
|||||
app s | TCB Information | |||||
1 2 3 | TCB Application Email Address |
s******@nemko.com
|
||||
1 2 3 | TCB Scope |
A4: UNII devices & low power transmitters using spread spectrum techniques
|
||||
app s | FCC ID | |||||
1 2 3 | Grantee Code |
XMR
|
||||
1 2 3 | Equipment Product Code |
201911SC20WL
|
||||
app s | Person at the applicant's address to receive grant or for contact | |||||
1 2 3 | Name |
J******** H********
|
||||
1 2 3 | Telephone Number |
+8602******** Extension:
|
||||
1 2 3 | Fax Number |
+8621********
|
||||
1 2 3 |
j******@quectel.com
|
|||||
app s | Technical Contact | |||||
n/a | ||||||
app s | Non Technical Contact | |||||
n/a | ||||||
app s | Confidentiality (long or short term) | |||||
1 2 3 | Does this application include a request for confidentiality for any portion(s) of the data contained in this application pursuant to 47 CFR § 0.459 of the Commission Rules?: | Yes | ||||
1 2 3 | Long-Term Confidentiality Does this application include a request for confidentiality for any portion(s) of the data contained in this application pursuant to 47 CFR § 0.459 of the Commission Rules?: | Yes | ||||
1 2 3 | If so, specify the short-term confidentiality release date (MM/DD/YYYY format) | 07/04/2020 | ||||
if no date is supplied, the release date will be set to 45 calendar days past the date of grant. | ||||||
app s | Cognitive Radio & Software Defined Radio, Class, etc | |||||
1 2 3 | Is this application for software defined/cognitive radio authorization? | No | ||||
1 2 3 | Equipment Class | DTS - Digital Transmission System | ||||
1 2 3 | DSS - Part 15 Spread Spectrum Transmitter | |||||
1 2 3 | NII - Unlicensed National Information Infrastructure TX | |||||
1 2 3 | Description of product as it is marketed: (NOTE: This text will appear below the equipment class on the grant) | Smart Module | ||||
1 2 3 | Related OET KnowledgeDataBase Inquiry: Is there a KDB inquiry associated with this application? | No | ||||
1 2 3 | Modular Equipment Type | Single Modular Approval | ||||
1 2 3 | Purpose / Application is for | Change in Identification | ||||
1 2 3 | Composite Equipment: Is the equipment in this application a composite device subject to an additional equipment authorization? | Yes | ||||
1 2 3 | Related Equipment: Is the equipment in this application part of a system that operates with, or is marketed with, another device that requires an equipment authorization? | No | ||||
1 2 3 | Grant Comments | Single Modular Approval. Power output listed is conducted. This device is to be used only for mobile and fixed application, with a host antenna circuit trace layout design in strict compliance with the OEM instructions provided, and must not be co-located or operating in conjunction with any other antenna or transmitter, except in accordance with FCC multi-transmitter evaluation procedures as documented in this filing. OEM integrators must be provided with host antenna circuit trace layout design, antenna installation instructions, and labeling requirements for finished products. OEM integrators and End-users must be provided with transmitter operation conditions for satisfying RF exposure compliance. | ||||
1 2 3 | Is there an equipment authorization waiver associated with this application? | No | ||||
1 2 3 | If there is an equipment authorization waiver associated with this application, has the associated waiver been approved and all information uploaded? | No | ||||
app s | Test Firm Name and Contact Information | |||||
1 2 3 | Firm Name |
Sporton International (Kunshan) Inc.
|
||||
1 2 3 | Name |
M****** L******
|
||||
1 2 3 | Telephone Number |
+86 0********
|
||||
1 2 3 |
m******@sporton-lab.com
|
|||||
Equipment Specifications | |||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Line | Rule Parts | Grant Notes | Lower Frequency | Upper Frequency | Power Output | Tolerance | Emission Designator | Microprocessor Number | |||||||||||||||||||||||||||||||||
1 | 1 | 15C | CC | 2402 | 2480 | 0.002 | |||||||||||||||||||||||||||||||||||
1 | 2 | 15C | CC | 2412 | 2462 | 0.1469 | |||||||||||||||||||||||||||||||||||
1 | 3 | 15C | CC | 2422 | 2452 | 0.1626 | |||||||||||||||||||||||||||||||||||
Line | Rule Parts | Grant Notes | Lower Frequency | Upper Frequency | Power Output | Tolerance | Emission Designator | Microprocessor Number | |||||||||||||||||||||||||||||||||
2 | 1 | 15C | CC | 2402.00000000 | 2480.00000000 | 0.0065000 | |||||||||||||||||||||||||||||||||||
Line | Rule Parts | Grant Notes | Lower Frequency | Upper Frequency | Power Output | Tolerance | Emission Designator | Microprocessor Number | |||||||||||||||||||||||||||||||||
3 | 1 | 15E | 38 CC | 5180 | 5240 | 0.024 | |||||||||||||||||||||||||||||||||||
3 | 2 | 15E | 38 CC | 5190 | 5230 | 0.0199 | |||||||||||||||||||||||||||||||||||
3 | 3 | 15E | 38 CC | 5260 | 5320 | 0.0246 | |||||||||||||||||||||||||||||||||||
3 | 4 | 15E | 38 CC | 5270 | 5310 | 0.0209 | |||||||||||||||||||||||||||||||||||
3 | 5 | 15E | 38 CC | 5500 | 5580 | 0.0196 | |||||||||||||||||||||||||||||||||||
3 | 6 | 15E | 38 CC | 5660 | 5700 | 0.0207 | |||||||||||||||||||||||||||||||||||
3 | 7 | 15E | 38 CC | 5510 | 5550 | 0.0116 | |||||||||||||||||||||||||||||||||||
3 | 8 | 15E | 38 CC | 5670 | 5670 | 0.017 | |||||||||||||||||||||||||||||||||||
3 | 9 | 15E | 38 CC | 5745 | 5825 | 0.0157 | |||||||||||||||||||||||||||||||||||
3 | 1 | 15E | 38 CC | 5755 | 5795 | 0.012 |
some individual PII (Personally Identifiable Information) available on the public forms may be redacted, original source may include additional details
This product uses the FCC Data API but is not endorsed or certified by the FCC