Hardware Design

Module Pin Diagram

Pin	Pin Name	Type	Pin Descriptions
1	UART_TX	O	UART TX
2	UART_RX	I	UART RX
5	I2S_CLK	I/O	I2S bit clock
6	I2S_OUT	O	I2S data output
7	I2S-IN	I	I2S data input
8	I2S-WS	I/O	Frame Sync Clock
11	RESET	I	Active-low reset
12	VDD_3V3	VDD	3.3V power supply
13	GND	GND	GND
16	MIC_BIAS	O	Microphone bias voltage
17	MIC-	I	MIC negative
18	MIC+	I	MIC positive
32	PIO9（LED）	I/O	Operating status indicator Pin
33	PIO10（Status）	I/O	Connection indicator Pin
36	EXT_ANT	ANT	External antenna Pin

To ensure the stable operation of the Bluetooth module, the power supply for the VDD_3V3 pin must reserve a current of ≥ 300mA for the Bluetooth module.
If the power supply is converted from 5V to 3.3V, you can refer to the following optional recommended schematic diagram for design:

For the module’s simple test environment, you only need to connect VDD / GND / UART_RX / UART_TX to test and use it.
After completing the PCB circuit schematic, please contact the staff of Feasycom for review to prevent the Bluetooth range from failing to reach the optimal performance.