Quectel FC905A, User Manual, Page: 5 / 52

Wi-Fi&Bluetooth Module Series
FC905A_Hardware_Design 4 / 51
Contents
Safety Information .................................................................................................................................... 3
Contents .................................................................................................................................................... 4
Table Index ............................................................................................................................................... 6
Figure Index .............................................................................................................................................. 7
1
Introduction ....................................................................................................................................... 8
1.1. Special Marks ......................................................................................................................... 12
2
Product Overview ............................................................................................................................ 13
2.1. General Description ................................................................................................................ 13
2.2. Key Features .......................................................................................................................... 13
2.3. EVB ........................................................................................................................................ 15
3
Application Interfaces ..................................................................................................................... 16
3.1. General Description ................................................................................................................ 16
3.2. Pin Assignment ...................................................................................................................... 17
3.3. Pin Description ....................................................................................................................... 18
3.4. Power Supply ......................................................................................................................... 20
3.4.1. Power Supply Pins Introduction ................................................................................... 20
3.4.2. Buck Circuit Pins Introduction ...................................................................................... 21
3.5. WLAN Application Interface .................................................................................................... 22
3.5.1. SDIO Interface ............................................................................................................. 22
3.5.2. WLAN_EN ................................................................................................................... 24
3.5.3. WLAN_WAKE ............................................................................................................. 24
3.6. Bluetooth Application Interface ............................................................................................... 24
3.6.1. UART Interface ............................................................................................................ 25
3.6.2. BT_EN ......................................................................................................................... 26
3.6.3. BT_WAKE_HOST and HOST_WAKE_BT .................................................................. 26
3.6.4. PCM Interface ............................................................................................................. 27
3.7. Other Interfaces ...................................................................................................................... 28
3.7.1. WLAN_SLP_CLK ........................................................................................................ 28
3.7.2. XTAL_IN/OUT ............................................................................................................. 29
3.7.3. SDIO_VSEL ................................................................................................................ 29
3.7.4. GPIOs ......................................................................................................................... 29
3.8. RF Antenna Interfaces ............................................................................................................ 30
3.8.1. Operating Frequency ................................................................................................... 30
3.8.2. Pin Definition of RF Antenna Interface ........................................................................ 30
3.8.3. Reference Design ........................................................................................................ 31
3.8.4. Reference Design of RF Routing ................................................................................. 31
3.8.5. Requirements for Antenna Design .............................................................................. 33
3.8.6. RF Connector Recommendation ................................................................................. 33