Wi-Fi&BT Module Series
FC21 Hardware Design
FC21_Hardware_Design 24 / 52
3.5.2.2. BT_WAKE_HOST
BT_WAKE_HOST is used to wake up the EC2x&EG2x-G module. When the pin is pulled down,
EC2x&EG2x-G can be woken up.
Table 10: Pin Definition of BT_WAKE_HOST
Pin Name
Pin No.
I/O
Description
Comment
BT_WAKE_HOST
46
OD
BT wake up the host
1.8V power domain.
Active Low.
Pulled up internally.
If unused, keep this pin
open.
3.5.2.3. PCM Interface
FC21 provides a PCM interface for BT application. The following table shows the pin definition of PCM
interface. The PCM interface is not needed when a BLE function is used.
Table 11: Pin Definition of PCM Interface
Pin Name
Pin No.
I/O
Description
Comment
PCM_IN
13
DI
BT PCM data input
1.8V power domain.
If unused, keep these pins open.
PCM_SYNC
14
DI
BT PCM data frame
synchronization signal
PCM_CLK
15
DI
BT PCM data bit clock
PCM_OUT
16
DO
BT PCM data output
The following figure shows a reference design for PCM interface connection between FC21 and
EC2x&EG2x-G.