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Figure 6: Reference Design for UART Interface Connection
NOTE
When paired with Quectel's LTE modules (EC21 series and EC25 series), 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 FC905A. Bluetooth function will be enabled when
BT_EN is at high level.
Table 12: Pin Definition of BT_EN
Pin Name
Pin No.
BT_EN
34
3.6.3. BT_WAKE_HOST and HOST_WAKE_BT
BT_WAKE_HOST and HOST_WAKE_BT are used to wake up Bluetooth function.
FC905A_Hardware_Design
I/O
Description
DI
Bluetooth enable control
Wi-Fi&Bluetooth Module Series
Comment
Active high.
If unused, please pull it down.
VIO power domain.
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