User's Manual

FC20-N Series Hardware Design
FC20-N_Series_Hardware_Design Confidential / Released 20 /
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The following figure shows the recommended power on/off sequences for FC20 series.
VDD_3V3
≥ 5us
Module
Status
Runnig
WLAN_EN
Power up
Power down
TBD
PM_ENABLE
>0
> 0
VIO
BT_EN
Figure 4: Timing of Power ON/OFF the FC20 Series Module
Execute AT command AT+QWIFI=1 to open VDD_3V3 and WLAN.
3.5. WLAN Interface
The following figure shows the WLAN interface connection between FC20 series and EC20
R2.0/EC21/EC25.
EC20 R2.0/
EC21/EC25
FC20 Series
SDIO
WLAN_ENWLAN_EN
WAKE_ON_WIRELESS
WAKE_ON_WIRELESS
SDIO
Figure 5: WLAN Interface Connection