Wi-Fi&Bluetooth Module Series
FC80A_Hardware_Design 21 / 43
3.5.1. BT_EN
BT_EN is used to control the Bluetooth function of FC80A. Bluetooth function will be enabled when
BT_EN is at high level.
Table 9: Pin Definition of BT_EN
3.5.2. UART Interface
FC80A supports an HCI UART as defined in
Bluetooth Core Specification Version 5.0
. 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 10: Pin Definition of UART Interface
The voltage range of the Bluetooth UART interface of FC80A is determined by VDDIO. It is necessary to
pay attention to whether the voltage range of host and FC80A Bluetooth UART interface is consistent. If
necessary, voltage-level translator shall be added.
The following figure shows a reference design for UART interface connection between FC80A and host.
Pin Name
Pin No.
I/O
Description
Comment
BT_EN
38
DI
Bluetooth enable control
Active high.
Pin Name
Pin No.
I/O
Description
Comment
BT_TXD
40
DO
Bluetooth UART transmit
VDDIO power domain
BT_RXD
41
DI
Bluetooth UART receive
BT_RTS
42
DO
Bluetooth UART request to send
BT_CTS
43
DI
Bluetooth UART clear to send
