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The voltage range of the Bluetooth UART interface of FC908A is determined by VDDIO. It is necessary to
pay attention to whether the voltage range of host and FC908A 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 FC908A and host.
Figure 8: Reference Design for UART Interface Connection
NOTE
When paired with Quectel's LTE modules, it may be their own CTS connected to CTS and RTS
connected to RTS. This depends on the input and output directions, so in principle, when connected, the
input corresponds to the output.
3.6.2. BT_EN
BT_EN is used to control the Bluetooth function of FC908A. Bluetooth function will be enabled when
BT_EN is at high level.
Table 14: Pin Definition of BT_EN
Pin Name
Pin No.
BT_EN
34
FC908A_Hardware_Design
FC908A
BT_TXD
BT_RXD
BT_RTS
BT_CTS
I/O
Description
DI
Bluetooth enable control
Wi-Fi&Bluetooth Module Series
Host
UART_RXD
UART_TXD
UART_CTS
UART_RTS
Comment
Active high.
If unused, please pull it down.
VDDIO power domain.
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