Product Info

Wi-Fi&BT Module Series
FC21 Hardware Design
FC21_Hardware_Design 20 / 52
The following figure shows the recommended power on/off sequences for FC21 module.
VDD_3V3
≥ 5 µs
Module
Status
Runnin g
WLAN_EN
Power up
Power down
PM_ENABL E
>0
> 0
VIO
≥0
≥ 10 µs
Figure 4: Timing of Turning on/off FC21 Module
3.5. Wireless Connectivity Interfaces
FC21 support a low-power SDIO 3.0 interface for WLAN, and UART&PCM interfaces for BT function.
3.5.1. Wi-Fi Interface
The following figure shows the WLAN interface connection between FC21 and EC2x&EG2x-G.
EC2x&EG2x-G
FC21
SDIO
WLAN_ENWLAN_EN
WAKE_ON_WIRELESS
WAKE_ON_WIRELESS
SDIO
Figure 5: Wi-Fi Interface Connection