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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 FC800L is determined by VDDIO. It is necessary to
pay attention to whether the voltage range of host and FC800L 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 FC800L and host.
Figure 6: Reference Design for UART Interface Connection
3.6.3.
BT_WAKE_HOST*
Table 10: Pin Definition of BT_WAKEUP_HOST and HOST_WAKEUP_BT
Pin Name
HOST_WAKE_BT
BT_WAKE_HOST
3.6.4. PCM
Interface*
PCM interface is used for audio over Bluetooth phone. The following table shows the pin definition of
PCM interface.
FC800L_Hardware_Design
I/O
Description
DO
Bluetooth UART transmit
DI
Bluetooth UART receive
DO
Bluetooth UART request to send
DI
Bluetooth UART clear to send
FC800L
BT_TXD
BT_RXD
BT_RTS
BT_CTS
and
HOST_WAKE_BT*
Pin No.
I/O
Description
49
DI
Host wakes up Bluetooth
50
DO
Bluetooth wakes up host
Wi-Fi&Bluetooth Module Series
Comment
VDDIO power domain
Host
UART_RXD
UART_TXD
UART_CTS
UART_RTS
Comment
VDDIO power domain
27 / 50
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