User's Manual

FC20-N Series Hardware Design
FC20-N_Series_Hardware_Design Confidential / Released 21 /
47
3.5.1. WAKE_ON_WIRELESS Interface
WAKE_ON_WIRELESS interface is used to wake up the EC20 R2.0/EC21/EC25. When
WAKE_ON_WIRELESS is pulled down, EC20 R2.0/EC21/EC25 can be woken up.
Table 6: Pin Definition of WAKE_ON_WIRELESS
Pin Name
Pin No.
I/O
Description
Comment
WAKE_ON_WIRELESS
32
DO
Wake up host
Active low.
If unused, keep this pin
open.
3.5.2. WLAN_EN
WLAN_EN is used to control the WLAN function of FC20 series. When WLAN_EN is at high level voltage,
WLAN function will be enabled.
Table 7: Pin Definition of WLAN_EN
Pin Name
Pin No.
I/O
Description
Comment
WLAN_EN
9
DI
WLAN enabled
Active high
WLAN_EN is a sensitive signal, which should be guarded by ground and routed as close as possible to
FC20 series module.
3.5.3. SDIO Interface
The following table shows the pin definition of the SDIO interface of FC20 series.
Table 8: Pin Definition of the SDIO Interface
Pin Name
Pin No.
I/O
Description
Comment
SDIO_D3
22
IO
SDIO data pin bit 3
1.8V power domain
SDIO_D2
23
IO
SDIO data pin bit 2
1.8V power domain.
Require external pull-up to
NOTE