User's Manual

Wi-Fi&BT Module Series
FC20 Series Hardware Design
FC20_Series_Hardware_Design Confidential / Released 24 / 47
3.6. BT Interface
BT function is only supported by FC20. Please keep these pins open in FC20-N.
The following figure shows the block diagram of BT interface connection between FC20 and EC20
R2.0/EC21/EC25.
If BT interface of FC20 module is used, the UART and PCM interfaces of EC20 R2.0/EC21/EC25 must be
used.
PCM
UART
FC20
UART
PCM
EC20 R2.0/
EC21/EC25
BT_EN
BT_EN
Figure 7: Block Diagram of BT Interface Connection
3.6.1. BT_EN
BT_EN is used to control the BT function of FC20 module. When BT_EN is at high level voltage, BT
function will be enabled.
Table 9: Pin Definition of BT_EN
Pin Name
Pin No.
I/O
Description
Comment
BT_EN
10
DI
Bluetooth enabled
Active high
3.6.2. PCM Interface
The following table shows the pin definition of PCM interface.