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Quectel FC908A, Hardware Design

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                                                                                                                          Wi-Fi&Bluetooth  Module  Series

 

 

FC908A_Hardware_Design                                                                                                                        40  / 49 

 
 

 

 

4.4. RF Performance 

 

The following tables summarize the transmitting and receiving performances of FC908A. 

 

4.4.1.  Conducted RF Performance of Wi-Fi 

Table 30: Conducted RF Output Power at 2.4 GHz Wi-Fi 

 

Table 31: Conducted RF Receiving Sensitivity at 2.4 GHz Wi-Fi 

TX 11 Mbps @ 16 dBm 

271 

0.46 

mA 

802.11g 

TX 6 Mbps @ 15 dBm 

270 

0.46

 

mA 

TX 54 Mbps @15 dBm 

197 

0.46

 

mA 

802.11n 

HT20 

TX MCS0 @ 14 dBm 

258 

0.46

 

mA 

TX MCS7 @ 14 dBm 

186 

0.46

 

mA 

Description 

Min. 

Typ. 

Unit 

802.11b @ 1 Mbps 

14.5 

16 

dBm 

802.11b @ 11 Mbps 

14.5 

16 

dBm 

802.11g @ 6 Mbps 

13.5 

15 

dBm 

802.11g @ 54 Mbps 

13.5 

15 

dBm 

802.11n, HT20 @ MCS0 

12.5 

14 

dBm 

802.11n, HT20 @ MCS7 

12.5 

14 

dBm 

Description 

Receiving Sensitivity (Typ.) 

Unit 

802.11b @ 1 Mbps 

-95 

dBm 

802.11b @ 11 Mbps 

-89 

dBm 

802.11g @ 6 Mbps 

-91 

dBm 

Summary of Contents for FC908A

Page 1: ...FC908A Hardware Design Wi Fi Bluetooth Module Series Version 1 0 0 Date 2021 12 03 Status Preliminary ...

Page 2: ...asonable efforts to provide the best possible experience you hereby acknowledge and agree that this document and related services hereunder are provided to you on an as available basis We may revise or restate this document from time to time at our sole discretion without any prior notice to you Copyright Our and third party products hereunder may contain copyrighted material Such copyrighted mate...

Page 3: ...stomer designated servers Quectel strictly abiding by the relevant laws and regulations shall retain use disclose or otherwise process relevant data for the purpose of performing the service only or as permitted by applicable laws Before data interaction with third parties please be informed of their privacy and data security policy Disclaimer a We acknowledge no liability for any injury or damage...

Page 4: ...e 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 signal and cellular network cannot be guaranteed to connect in certain conditions such as when the mobile bill is unpaid or the U SIM card is invalid When emergency help is nee...

Page 5: ...odule Series FC908A_Hardware_Design 4 49 About the Document Revision History Version Date Author Description 2021 12 03 Elinor WANG Michael DU Creation of the document 1 0 0 2021 12 03 Elinor WANG Michael DU Preliminary ...

Page 6: ...2 Buck Circuit Pins Introduction 22 3 5 WLAN Application Interface 23 3 5 1 SDIO Interface 23 3 5 2 WLAN_EN 25 3 5 3 WLAN_WAKE 25 3 5 4 Introduction of WLAN Pin Multiplexing Function 26 3 6 Bluetooth Application Interface 27 3 6 1 UART Interface 27 3 6 2 BT_EN 28 3 6 3 BT_WAKE_HOST and HOST_WAKE_BT 29 3 6 4 PCM Interface 29 3 7 Other Interfaces 30 3 7 1 WLAN_SLP_CLK 30 3 7 2 XTAL_IN OUT 31 3 7 3 G...

Page 7: ... Conducted RF Performance of Wi Fi 40 4 4 2 Conducted RF Performance of Bluetooth 41 4 5 ESD 41 5 Mechanical Information 42 5 1 Mechanical Dimensions 42 5 2 Recommended Footprint 44 5 3 Top and Bottom Views 45 6 Storage Manufacturing Packaging 46 6 1 Storage Conditions 46 6 2 Manufacturing and Soldering 47 6 3 Packaging Specifications 49 6 3 1 Carrier Tape 49 6 3 2 Plastic Reel 49 6 3 3 Packaging ...

Page 8: ...ecommendation 30 Table 19 XO parameter definition 31 Table 20 Pin Definition of GPIO1 GPIO2 31 Table 21 FC908A operating frequency 32 Table 22 Pin Definition of RF Antenna Interfaces 32 Table 23 Antenna Cable Requirements 35 Table 24 Antenna requirements 35 Table 25 Absolute Maximum Ratings 38 Table 26 Recommended Operating Conditions 38 Table 27 General DC Electrical Characteristics for 1 8 V Dom...

Page 9: ...gn on a 2 layer PCB 33 Figure 13 Coplanar Waveguide Design on a 2 layer PCB 33 Figure 14 Coplanar Waveguide Design on a 4 layer PCB Layer 3 as Reference Ground 34 Figure 15 Coplanar Waveguide Design on a 4 layer PCB Layer 4 as Reference Ground 34 Figure 16 Dimensions of the U FL R SMT Connector Unit mm 36 Figure 17 Mechanicals of U FL LP Connectors 36 Figure 18 Space Factor of Mated Connector Unit...

Page 10: ...e user is encouraged to try to correct the interference by one or more 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 This device complies with FCC ...

Page 11: ...ollowing text Contains FCC ID XMR202206FC908A The FCC ID can be used only when all FCC compliance requirements are met Antenna Installation 1 The antenna must be installed such that 20 cm is maintained between the antenna and users 2 The transmitter module may not be co located with any other transmitter or antenna 3 Only antennas of the same type and with equal or less gains as shown below may be...

Page 12: ...ntegrator is still responsible for testing their end product for any additional compliance requirements required with this module installed Cet appareil est conç u uniquement pour les inté grateurs OEM dans les conditions suivantes Pour utilisation de dispositif module 1 L antenne doit ê tre installé e de telle sorte qu une distance de 20 cm est respectée entre l antenne et les utilisateurs et 2 L...

Page 13: ...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 user s manual of the end product which integrates this module The end user manual shall include all required regulatory information warning as show in this manual Manuel d information àl utilisateur final L intégrateur OEM doit être conscient de ne pas fournir des info...

Page 14: ... PCM interface for Bluetooth FC908A can provide WLAN and Bluetooth functions 2 2 Key Features The following table describes the key features of FC908A Table 2 Key Features Features Details Power Supply VBAT power supply Supply voltage range 3 0 4 8 V Typical supply voltage 3 6 V VDDIO power supply Supply voltage range 1 71 3 63 V Typical supply voltage 1 8 3 3 V Module buck VIN_LDO_OUT VIN_LDO typ...

Page 15: ...Mode AP STA Wi Fi Modulation DSSS OFDM DBPSK DQPSK CCK BPSK QPSK 16QAM 64QAM WLAN Application Interface SDIO 2 0 Bluetooth Application Interface UART and PCM RF Antenna Interfaces ANT_WIFI0 BT 50 Ω impedance Physical Characteristics Size 12 0 0 15 mm 12 0 0 15 mm 1 95 0 2 mm Package LCC Weight TBD Temperature Range Operating temperature range 30 C to 85 C 1 Storage temperature range 40 C to 85 C R...

Page 16: ...internal crystal or external crystal 2 4 EVB To help customers to develop applications with FC908A the evaluation board tools include EVB board FC908A M 2 and corresponding TE A USB 2 0 data cable antenna and other external devices used to control and test the module For details see document 1 NOTE ...

Page 17: ...ption FC908A is equipped with 44 LCC pins The subsequent chapters will provide a detailed introduction to the following function pins and interfaces of the module Power supply WLAN application interface Bluetooth application interface RF antenna interfaces Other interfaces WLAN_SLP_CLK XTAL_IN OUT GPIO ...

Page 18: ... 2 1 23 24 25 27 28 26 29 30 31 32 33 SDIO_DATA0 SDIO_CLK SDIO_CMD VIO GND GND RESERVED 41 39 38 40 37 36 35 34 43 42 44 BT_EN RESERVED GND RESERVED GPIO2 RESERVED BT_CTS GPIO1 BT_TXD BT_RTS BT_RXD GND GND ANT_WIFI0 BT RESERVED RESERVED HOST_WAKE_BT BT_WAKE_HOST RESERVED VBAT XTAL_OUT XTAL_IN FC908A GND Power WLAN Bluetooth RF XTAL Other signals RESERVED GPIO Figure 1 Pin Assignment Top View 1 Kee...

Page 19: ...t PI Power Input PO Power Output Power Supply Pin Name Pin No I O Description Comment VBAT 9 PI Power supply for the module VDDIO 22 PI Power supply for module s I O pins VIN_LDO_OUT 21 PO Internal buck output for the module VIN_LDO 23 PI Internal buck input for the module GND 1 3 20 31 33 36 WLAN Application Interface Pin Name Pin No I O Description Comment WLAN_EN 12 DI WLAN function enable cont...

Page 20: ...erface Pin Name Pin No I O Description Comment BT_EN 34 DI Bluetooth enable control VDDIO power domain Active high If unused pull it down HOST_WAKE_BT 6 DI Host wakes up Bluetooth VDDIO power domain If unused keep them open BT_WAKE_HOST 7 DO Bluetooth wakes up host PCM_DOUT 25 DO PCM data output PCM_CLK 26 DI PCM clock PCM_DIN 27 DI PCM data input PCM_SYNC 28 DI PCM data frame sync BT_RTS 41 DO Bl...

Page 21: ... GPIO2 If you need please contact the QUECTEL team Other Interfaces Pin Name Pin No I O Description Comment WLAN_SLP_CLK 24 DI External 32 768 kHz low power clock input XTAL_IN 10 DI Crystal input Optional XTAL_OUT 11 DO Crystal output GPIO1 3 40 DIO General purpose input output If unused keep them open GPIO2 39 DIO General purpose input output RESERVED Pin Name Pin No Comment RESERVED 4 5 8 29 30...

Page 22: ...VBAT input terminal to improve the surge voltage bearing capacity of the module In principle the longer the VBAT line the wider the line When paired with LTE it is recommended to use 10 pF and 33 pF for C2 C4 The reference circuit of VBAT input terminal is as shown in the figure below FC908A VBAT VBAT D1 C2 C3 C4 NM C1 100 μF 1 μF 100 nF R1 0R Figure 2 VBAT Circuit The time sequence of FC908A powe...

Page 23: ...d to use 2 2 μH inductors such as TFM201610ALM 2R2MTAA TDK and 4 7 μF capacitors to ensure that the traces are as short as possible and the trace width shall not be less than 0 4mm At the same time it is recommended to route the wires away from sensitive signals The following is the buck circuit reference circuit and inductance parameter recommendation table Figure 4 Recommended Reference Design C...

Page 24: ...erface FC908A is used for SDIO 2 0 interface supports 1 bit mode or 4 bit mode automatic detection when SDIO link SDIO interface definition is as follows Table 8 Pin Definition of SDIO Interface DCR 0 2 Ω Rated current based on temperature rise 1 15 A Pin Name Pin No 1 bit Mode 4 bit Mode SDIO_DATA2 14 NC SDIO data bit 2 SDIO_DATA3 15 NC SDIO data bit 3 SDIO_CMD 16 SDIO command SDIO command SDIO_C...

Page 25: ...adopted Route the SDIO traces in inner layer of the PCB and the impedance is controlled at 50 Ω 10 SDIO signals need to be keep away from sensitive signals such as radio frequency analog signals clocks and DC DC noise signals SDIO_DATA 2 requires an external 10 kΩ resistor to be pulled up to VDDIO and maintains a high level during the process of powering on the FC908A SDIO signal traces need to be...

Page 26: ...able signal When wiring keep it away from sensitive signals such as radio frequency analog signal clock and DC DC noise signals 3 5 3 WLAN_WAKE WLAN_WAKE is used to wake up the host Table 10 Pin Definition of WLAN_WAKE Pin Name Pin No I O Description Comment WLAN_EN 12 DI Wi Fi function enable control VDDIO power domain Active high Pin Name Pin No I O Description Comment WLAN_WAKE 13 DO Wake up th...

Page 27: ...hrough SDIO_DATA2 The SPI function is currently under development The following is the definition of SPI pin multiplexing Table 12 Pin Definition of SDIO Interface SDIO_DATA2 Mode Note L SPI Sampling at power on reset H SDIO Pin Name Pin No SPI Mode Description SDIO_DATA2 14 NC SDIO_DATA3 15 CS Card select SDIO_CMD 16 DI Data input SDIO_CLK 17 SCLK Clock SDIO_DATA0 18 DO Data output SDIO_DATA1 19 ...

Page 28: ...face Connection 3 6 1 UART Interface FC908A supports an HCI UART as defined in Bluetooth Core Specification Version 5 1 The UART supports hardware flow control and it is used for data transmission with host It supports up to 4 0 Mbps baud rates The following table shows the pin definition of UART interface Table 13 Pin Definition of UART Interface Pin Name Pin No I O Description Comment BT_RTS 41 ...

Page 29: ...T_TXD FC908A UART_RXD UART_TXD UART_CTS UART_RTS Host Figure 8 Reference Design for UART Interface Connection When paired with Quectel s LTE modules it may be their own CTS connected to CTS and RTS connected to RTS This depends on the input and output directions so in principle when connected the input corresponds to the output 3 6 2 BT_EN BT_EN is used to control the Bluetooth function of FC908A ...

Page 30: ...n Definition of PCM Interface The following figure shows the PCM interface connection between FC908A and the host FC908A Host PCM_CLK PCM_SYNC PCM_DOUT PCM_DIN PCM_CLK PCM_SYNC PCM_DIN PCM_DOUT Figure 9 PCM Interface Connection Pin Name Pin No I O Description Comment HOST_WAKE_BT 6 DI Host wakes up Bluetooth function VDDIO power domain BT_WAKE_HOST 7 DO Bluetooth function wakes up host Pin Name Pi...

Page 31: ...hen the module is in sleep mode Table 17 Pin Definition of WLAN_SLP_CLK Interface The following are the recommended selection parameters for the recommended 32 768 kHz crystal Table 18 WLAN_SLP_CLK parameter recommendation Pin Name Pin No I O Description WLAN_SLP_CLK 24 DI External 32 768 kHz low power clock input Parameter Value Unit Frequency 32 768 kHz Frequency accuracy 200 ppm Duty cycle 30 7...

Page 32: ...ding to the following table Table 19 XO parameter definition 3 7 3 GPIOs GPIO1 GPIO2 are function configuration pins which can be used to enter JTAG mode Please contact QUECTEL if necessary Table 20 Pin Definition of GPIO1 GPIO2 3 8 RF Antenna Interfaces ANT_WIFI0 BT is the RF antenna pin and the RF port requires 50 Ω characteristic impedance Parameter Min Typ Max Unit Frequency 26 MHz load capaci...

Page 33: ...types of RF trace with characteristic impendence close to 50 Ω FC908A comes with grounding pins which are next to the antenna pin in order to give a better grounding A reference circuit for the RF antenna interface is shown below It is recommended to reserve a LC and Π type matching circuit for better RF performance and it is also recommended to reserve an ESD protection component Matching compone...

Page 34: ...ed by the trace width W the materials dielectric constant the height from the reference ground to the signal layer H and the spacing 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 11 Microstrip Design on a ...

Page 35: ...ground The distance between the RF pins and the RF connector shall be as short as possible and all the right angle traces shall be changed to curved ones The recommended trace angle is 135 There shall be clearance area under the signal pin of the antenna connector or solder joint The reference ground of RF traces shall be complete Meanwhile adding some ground vias around RF traces and the referenc...

Page 36: ...ents are as follows Table 23 Antenna Cable Requirements The antenna requirements are as follows Table 24 Antenna requirements Type Requirements 2 412 2 484 GHz Cable insertion loss 1 dB Type Requirements Frequency Range 2 412 2 484 GHz VSWR 2 Gain dBi Typ 1 Max Input Power W 50 Input Impedance Ω 50 Polarization Type Vertical ...

Page 37: ...onnector is used for antenna connection it is recommended to use the U FL R SMT connector provided by HIROSE Figure 15 Dimensions of the U FL R SMT Connector Unit mm U FL LP serial connectors listed in the following figure can be used to match the U FL R SMT Figure 16 Mechanicals of U FL LP Connectors ...

Page 38: ...Wi Fi Bluetooth Module Series FC908A_Hardware_Design 37 49 The following figure describes the space factor of mated connector Figure 17 Space Factor of Mated Connector Unit mm ...

Page 39: ...ing table shows the absolute maximum ratings Table 25 Absolute Maximum Ratings The following table shows the recommended operating conditions of the module Table 26 Recommended Operating Conditions Parameter Min Max Unit VBAT 0 3 5 5 V Digital I O Input Voltage 0 3 3 9 V Parameter Min Typ Max Unit VBAT 3 0 3 6 4 8 V VDDIO 1 71 1 8 3 3 3 63 V ...

Page 40: ...nsumption The values of current consumption are shown as below Table 29 Current Consumption of the Module Normal Operation Symbol Parameter Min Max Unit VIH High level Input Voltage 0 65 VDDIO V VIL Low level Input Voltage 0 35 VDDIO V VOH High level Output Voltage VDDIO 0 45 V VOL Low level Output Voltage 0 45 V Symbol Parameter Min Max Unit VIH High level Input Voltage 2 V VIL Low level Input Vo...

Page 41: ...itivity at 2 4 GHz Wi Fi TX 11 Mbps 16 dBm 271 0 46 mA 802 11g TX 6 Mbps 15 dBm 270 0 46 mA TX 54 Mbps 15 dBm 197 0 46 mA 802 11n HT20 TX MCS0 14 dBm 258 0 46 mA TX MCS7 14 dBm 186 0 46 mA Description Min Typ Unit 802 11b 1 Mbps 14 5 16 dBm 802 11b 11 Mbps 14 5 16 dBm 802 11g 6 Mbps 13 5 15 dBm 802 11g 54 Mbps 13 5 15 dBm 802 11n HT20 MCS0 12 5 14 dBm 802 11n HT20 MCS7 12 5 14 dBm Description Rece...

Page 42: ...ng anti static gloves during the development production assembly and testing of the module adding ESD protective components to the ESD sensitive interfaces and points in the product design Table 33 Electrostatic Discharge Characteristics 25 º C 45 Relative Humidity 802 11g 54 Mbps 76 dBm 802 11n HT20 MCS0 91 dBm 802 11n HT20 MCS7 73 dBm Description Transmitting Power Typ Receiving Sensitivity Typ ...

Page 43: ...al Information This chapter describes the mechanical dimensions of FC908A All dimensions are measured in millimeter mm and the dimensional tolerances are 0 2 mm unless otherwise specified 5 1 Mechanical Dimensions Figure 18 Top and Side Dimensions Top and Side View Pin 1 ...

Page 44: ...Wi Fi Bluetooth Module Series FC908A_Hardware_Design 43 49 Figure 19 Bottom Dimension Top View The package warpage level of the module conforms to JEITA ED 7306 standard NOTE Pin 1 ...

Page 45: ...908A_Hardware_Design 44 49 5 2 Recommended Footprint Figure 20 Recommended Footprint Top View Keep at least 3 mm between the module and other components on the motherboard to improve soldering quality and maintenance convenience NOTE ...

Page 46: ...esign 45 49 5 3 Top and Bottom Views Figure 21 Top and Bottom Views of the Module Images above are for illustration purpose only and may differ from the actual module For authentic appearance and label refer to the module received from Quectel NOTE ...

Page 47: ...han 10 e g a drying cabinet 4 The module shall be pre baked to avoid blistering cracks and inner layer separation in PCB under the following circumstances The module is not stored in Recommended Storage Condition Violation of the third requirement above occurs Vacuum sealed packaging is broken or the packaging has been removed for over 24 hours Before module repairing 5 If needed the pre baking sh...

Page 48: ...l the stencil openings and then penetrate to the PCB The force on the squeegee shall be adjusted properly to produce a clean stencil surface on a single pass To ensure the module soldering quality the thickness of stencil for the module is recommended to be 0 15 0 18mm For more details see document 3 The peak reflow temperature shall be 235 246 º C with 246 º C as the absolute maximum reflow tempe...

Page 49: ...ough white rust may be found 3 If a conformal coating is necessary for the module do NOT use any coating material that may chemically react with the PCB or shielding cover and prevent the coating material from flowing into the module 4 Avoid using ultrasonic technology for module cleaning since it can damage crystals inside the module 5 Due to the complexity of the SMT process please contact Quect...

Page 50: ...carrier tape packaging and details are as follow 6 3 1 Carrier Tape Dimension details are as follow Figure 23 Carrier Tape Dimension Drawing Table 35 Carrier Tape Dimension Table Unit mm 6 3 2 Plastic Reel Figure 24 Plastic Reel Dimension Drawing W P T A0 B0 K0 K1 F E 24 16 0 35 12 4 12 4 2 6 3 6 11 5 1 75 ...

Page 51: ...heat sealed carrier tape to the plastic reel and use the protective tape for protection 1 plastic reel can load 500 modules Place the packaged plastic reel humidity indicator card and desiccant bag into a vacuum bag vacuumize it Place the vacuum packed plastic reel into the pizza box Put 4 packaged pizza boxes into 1 carton and seal it 1 carton can pack 2000 modules Figure 25 Packaging Process øD1...

Page 52: ...Application_Note 3 Quectel_Module_Secondary_SMT_Application_Note Abbreviation Description AP Access Point BLE Bluetooth Low Energy BPSK Binary Phase Shift Keying BT Bluetooth CCK Complementary Code Keying CTS Clear To Send DQPSK Differential Quadrature Reference Phase Shift Keying GATT Generic Attribute Profile GND Ground HT High Throughput IEEE Institute of Electrical and Electronics Engineers I ...

Page 53: ...age RTS Request to Send RXD Receive Data TBD To Be Determined TXD Transmit Data UART Universal Asynchronous Receiver Transmitter USB Universal Serial Bus VIHmax Maximum High level Input Voltage VIHmin Minimum High level Input Voltage VILmax Maximum Low level Input Voltage VILmin Minimum Low level Input Voltage VOLmax Maximum Low level Output Voltage VOHmin Minimum High level Output Voltage Vnom No...

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