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Figure 8: Reference Design for PCM Interface
3.5.2.4. BT_UART Interface
FC21 provides a dedicated UART interface for BT application. The following table shows the pin definition
of UART interface.
Table 12: Pin Definition of UART Interface
Pin Name
Pin No.
BT_UART_RTS
7
BT_UART_CTS
8
BT_UART_TXD
17
BT_UART_RXD
18
The following figure shows a reference design for UART interface connection between FC21 and
EC2x&EG2x-G.
Figure 9: Reference Design for UART Interface Connection
FC21_Hardware_Design
I/O
Description
DO
BT UART request to send
DI
BT UART clear to send
DO
BT UART transmit data
DI
BT UART receive data
Wi-Fi&BT Module Series
FC21 Hardware Design
Comment
1.8V power domain.
If unused, keep these
pins open.
25 / 52
批注 [RL9]: 中文是
BT_UART，这里是否需要改为
一致
批注 [RL10R9]:
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