Bt_En; Uart Interface - Quectel FC80A User Manual

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
Pin Name Pin No.
BT_EN 38

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
Pin Name Pin No.
BT_TXD 40
BT_RXD 41
BT_RTS 42
BT_CTS 43
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.
FC80A_Hardware_Design
I/O Description
DI Bluetooth enable control
I/O Description
DO Bluetooth UART transmit
DI Bluetooth UART receive
DO Bluetooth UART request to send
DI Bluetooth UART clear to send
Wi-Fi&Bluetooth Module Series
Comment
Active high.
Comment
VDDIO power domain
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