Service Guide
          Wi-Fi&Bluetooth  Module  Series 
FC908A_Hardware_Design                                                                                                                   7  / 49 
Table Index 
Table 1: Special Mark................................................................................................................................. 12 
Table 2: Key Features ................................................................................................................................ 13 
Table 3: I/O Parameters Definition ............................................................................................................. 18 
Table 4: Pin Description ............................................................................................................................. 18 
Table 5: Definition of Power Supply and GND Pins................................................................................... 20 
Table 6: Definition of Buck Circuit Pins ...................................................................................................... 22 
Table 7: Recommended Inductance Parameters ...................................................................................... 22 
Table 8: Pin Definition of SDIO Interface ................................................................................................... 23 
Table 9: Pin Definition of WLAN_EN ......................................................................................................... 25 
Table 10: Pin Definition of WLAN_WAKE .................................................................................................. 25 
Table 11: Pin setting description ................................................................................................................ 26 
Table 12: Pin Definition of SDIO Interface ................................................................................................. 26 
Table 13: Pin Definition of UART Interface ................................................................................................ 27 
Table 14: Pin Definition of BT_EN ............................................................................................................. 28 
Table 15: Pin Definition of BT_WAKEUP_HOST and HOST_WAKEUP_BT ............................................ 29 
Table 16: Pin Definition of PCM Interface .................................................................................................. 29 
Table 17: Pin Definition of WLAN_SLP_CLK Interface ............................................................................. 30 
Table 18: WLAN_SLP_CLK parameter recommendation ......................................................................... 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 Domain ........................................................... 39 
Table 28: General DC Electrical Characteristics for 3.3 V Domain ........................................................... 39 
Table 29: Current Consumption of the Module (Normal Operation) .......................................................... 39 
Table 30: Conducted RF Output Power at 2.4 GHz Wi-Fi ......................................................................... 40 
Table 31: Conducted RF Receiving Sensitivity at 2.4 GHz Wi-Fi .............................................................. 40 
Table 32: Conducted RF Performance of Bluetooth .................................................................................. 41 
Table 33: Electrostatic Discharge Characteristics (25 ยบC, 45 % Relative Humidity) ................................. 41 
Table 34: Recommended Thermal Profile Parameters ............................................................................. 48 
Table 35: Carrier Tape Dimension Table (Unit: mm) ................................................................................. 49 
Table 36: Plastic Reel Dimension Table (Unit: mm) .................................................................................. 50 
Table 37: Related Documents .................................................................................................................... 51 
Table 38: Terms and Abbreviations ........................................................................................................... 51 










