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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 signal traces (SDIO_CLK and SDIO_DATA[0:3]/SDIO_CMD) need to be treated with equal
length (the distance between the traces is less than 0.5 mm).
The distance between SDIO signals and other signals must be greater than 2 times the trace width,
and the busload capacitance must be less than 15 pF.
The maximum length of the internal wiring of the SDIO module is 7.99 mm.
3.5.2. WLAN_EN
WLAN_EN is used to control the Wi-Fi function of the module. Wi-Fi function will be enabled when
WLAN_EN is at high level.
Table 9: Pin Definition of WLAN_EN
Pin Name
Pin No.
WLAN_EN
12
NOTE
WLAN_EN is the Wi-Fi function enable 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.
WLAN_WAKE
13
3.6. Bluetooth Application Interface
The following figure shows the block diagram of Bluetooth application interface connection between
FC905A and a host.
FC905A_Hardware_Design
I/O
Description
DI
Wi-Fi function enable control
I/O
Description
DO
Wake up the host by Wi-Fi
Wi-Fi&Bluetooth Module Series
Comment
VIO power domain.
Active high.
Comment
VIO power domain.
If unused, keep it open.
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