Wi-Fi&Bluetooth Module Series
FC800L_Hardware_Design 27 / 50
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.
BT_CTS
BT_RTS
BT_RXD
BT_TXD
FC800L
UART_RXD
UART_TXD
UART_CTS
UART_RTS
Host
Figure 6: Reference Design for UART Interface Connection
3.6.3. BT_WAKE_HOST
*
and HOST_WAKE_BT
*
Table 10: Pin Definition of BT_WAKEUP_HOST and HOST_WAKEUP_BT
Pin Name
Pin No.
I/O
Description
Comment
HOST_WAKE_BT
49
DI
Host wakes up Bluetooth
VDDIO power domain
BT_WAKE_HOST
50
DO
Bluetooth wakes up 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.
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