Wireless Connectivity Interfaces; Wi-Fi Interface - Quectel FC21 Hardware Design

The following figure shows the recommended power on/off sequences for FC21 module.
VIO
PM_ENABL E
VDD_3V3
WLAN_EN
Module
Status

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.
FC21
WLAN_EN
WAKE_ON_WIRELESS
FC21_Hardware_Design
≥0
>0
≥ 5 µs
Power up Runnin g
Figure 4: Timing of Turning on/off FC21 Module
SDIO
Figure 5: Wi-Fi Interface Connection
Wi-Fi&BT Module Series
FC21 Hardware Design
> 0
≥ 10 µs
Power down
EC2x&EG2x-G
SDIO
WLAN_EN
WAKE_ON_WIRELESS
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