Wi-Fi&Bluetooth Module Series
FC909A_Hardware_Design 27 / 49
3.5. Bluetooth Application Interfaces
The following figure shows the block diagram of Bluetooth application interfaces
connection between
FC909A and the host.
PCM
UART
FC909A
UART
PCM
Host
BT_EN
BT_EN
GPIO1
HOST_WAKE_BT
GPIO2
BT_WAKE_HOST
Figure 6: Block Diagram of Bluetooth Application Interfaces Connection
3.5.1. UART
FC909A supports an HCI UART as defined in
Bluetooth Core Specification Version 5.1
. The UART
supports hardware flow control, and it is used for data transmission with the host. It supports up to 4.0
Mbps baud rates.
Table 13: Pin Definition of UART
Pin Name
Pin No.
I/O
Description
Comment
BT_RTS
41
DO
Bluetooth UART request to send
VDDIO power domain
BT_TXD
42
DO
Bluetooth UART transmit
BT_RXD
43
DI
Bluetooth UART receive
BT_CTS
44
DI
Bluetooth UART clear to send