Functional Description
Default Configuration
Name |
FSC-BT3431 |
|---|---|
UART Baudrate |
115200/8/N/1 |
GPIO Indications
LED
PIN |
Status |
Description |
|---|---|---|
PIN 21 |
1Hz Square Wave |
Bluetooth Disconnected |
PIN 21 |
High Level |
Bluetooth Connected |
BT Connection Status
PIN |
Status |
Description |
|---|---|---|
PIN 22 |
Low Level |
Bluetooth Disconnected |
PIN 22 |
High Level |
Bluetooth Connected |
GATT Service
Type |
UUID |
Permission |
Description |
|---|---|---|---|
Service |
0xFFF0 |
Throughput transmission service |
|
Write |
0xFFF2 |
Write， |
Sent from APP to Module |
Notify |
0xFFF1 |
Notify |
Sent from Module to APP |
Working Mode
Throughput Mode
Bluetooth Not Connected: Data received via UART is parsed as AT commands.
Bluetooth Connected: All data received via UART is sent as-is to the remote Bluetooth device.
Command Mode
Bluetooth Not Connected: Data received via UART is parsed as AT commands.
Bluetooth Connected: Data received via UART is still parsed as AT commands. Data must be sent to the remote device using AT commands, e.g.,
AT+LESEND.
Low-Power Strategy
Low-Power Mode Setting
The low-power function can be enabled or disabled via the command AT+LPM{=Param}.
Low-Power Operation Strategy
AT+LPM=1
BT automatically enters low-power mode if no data is received from the BT UART for more than 5 second.
The first frame of data from the BT UART wakes up Bluetooth.
Does not enter low-power mode after a successful connection.
AT+LPM=2
When the MCU pulls PIN7 high, BT enters sleep mode.
when the MCU pulls PIN7 low, BT exits sleep mode.
After Bluetooth connection, BT pulls PIN8 low to notify the MCU to exit sleep mode, and outputs data with a 10ms delay.
After Bluetooth disconnection, BT pulls PIN8 high to notify the MCU to enter sleep mode.
Data Rate (Typical)
Baudrate |
Data Packet |
Transmission Interval |
Connection Interval |
Transmission Method |
Rate |
|---|---|---|---|---|---|
921600 |
244 |
20ms |
7.5ms |
Notify |
12000 Byte/s |