Hardware Design

Module Pin Diagram

Pin	Pin Name	Type	Pin Descriptions
4	I2S_CLK	I/O	I2S bit clock
5	I2S_IN	I	I2S data input
6	I2S_OUT	O	I2S data output
7	I2S_WS	I/O	Frame Sync Clock
8	RESET	I	active-low reset
13	UART_TX	O	UART TX
14	UART_RX	I	UART RX
17	LED0	I/O	Bluetooth Status Indication
32	GND	GND	GND
33	VDD	VDD	3.3V power supply
43	MIC_LP	Audio	Left MIC Differential Input Positive
44	MIC_LN	Audio	Left MIC Differential Input Negative
45	MIC_BIAS	Audio	microphone bias voltage
46	SPK_RN	Audio	Analog Output Right Channel Negative
47	SPK_RP	Audio	Analog Output Right Channel Positive
48	SPK_LN	Audio	Analog Output Left Channel Negative
49	SPK_LP	Audio	Analog Output Left Channel Positive
51	EXT_ANT	ANT	external Bluetooth antenna

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:

5v-3.3v-op

PIN	Description
PIN51	To avoid signal discrepancies, external Bluetooth antenna is required

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.