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3.6. Bluetooth Application Interface
The following figure shows the block diagram of Bluetooth application interface connection between
FC908A and a host.
Figure 7: Block Diagram of Bluetooth Application Interface Connection
3.6.1. UART Interface
FC908A 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 host. It supports up to 4.0 Mbps
baud rates.
The following table shows the pin definition of UART interface.
Table 13: Pin Definition of UART Interface
Pin Name
Pin No.
BT_RTS
41
BT_TXD
42
BT_RXD
43
BT_CTS
44
FC908A_Hardware_Design
FC908A
UART
PCM
BT_EN
BT_WAKE_HOST
HOST_WAKE_BT
I/O
Description
DO
Bluetooth UART request to send
DO
Bluetooth UART transmit
DI
Bluetooth UART receive
DI
Bluetooth UART clear to send
Wi-Fi&Bluetooth Module Series
Host
UART
PCM
BT_EN
Interrupt GPIO1
Interrupt GPIO2
Comment
VDDIO power domain
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