Feasycom FSC-BT691 - Hardware Part; PIN Diagram and Definition

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2. Hardware Part
2.2 PIN diagram
2.3 PIN definition description
PIN Name Pin Type PIN Description
NC Not recommended to connect
UART_TX 1 I/O UART TX
UART_RX 2 I/O UART RX
TRAN 5 I
When the Bluetooth connection is established and the pin
function is enabled, the high level is the command mode,
and the low level is the transparent transmission mode
VDD 7 Power
GND 8,19 Power
SWDIO 9 I/O
SWDCLK 10 I/O
DISC 15 I
When the Bluetooth connection is established and the pin
function is enabled, the falling edge triggers
the disconnection of the Bluetooth connection.
LED 17 O Module work status
STATUS 18 O Bluetooth connection status indicator
RF 20 RF Use when using an external antenna