Hardware Design

Module PIN Diagram

Pin diagram with FSC-BW256B:

bw256b

Pin	Pin Name	Type	Descriptions
1	UART1_TX	O	UART data output
2	UART1_RX	I	UART data input
3	UART_CTS	I/O	UART clear to send (active low)
4	UART_RTS	I/O	UART request to send (active low)
5	SPI_CLK/SD1	I/O	SPI_CLK. Alternative function: SDIO D1 as slave; SDIO D2 as master.
6	SPI_CS/SD0	I/O	SPI_CS. Alternative function: SDIO D0 as slave; SDIO D3 as master.
7	SPI_MISO/SCMD	I/O	SPI_MISO. Alternative function: SDIO CMD as slave; SDIO CLK as master.
8	SPI_MOSI/SCLK	I/O	SPI_MOSI. Alternative function: SDIO CLK as slave; SDIO CMD as master.
9	DEBUG_OUT	I/O	Debug Interface (Data OUT)
10	DEBUG_IN	I/O	Debug Interface (Data IN)
11	PWRKEY	I	Module power-on pin; Power-on=1; Power-off=0; There is a 47K resistor inside the module, which is pulled up to VDD 3V3
12	VDD_3V3	VDD	3.3V power supply
13	GND	VSS	Power Ground
17	SD2	I/O	SDIO D2 as master; SDIO D1 as slave.
18	SD3	I/O	SDIO D3 as master; SDIO D0 as slave.
21	GND	VSS	Power Ground
22	GND	VSS	Power Ground
23	USB_DM	I/O	USB data D- Hang in the air when not use, no need to connect
24	USB_DP	I/O	USB data D+ Hang in the air when not use, no need to connect
32	LED0	I/O	Bluetooth is connected to output high
33	LED1	I/O	Wi-Fi is connected to output high level
35	GND	VSS	RF Ground
36	EXT_ANT	ANT	Wi-Fi 2.4G radio frequency Wi-Fi 5G radio frequency (optional)

Note: This section provides brief I/O pin descriptions. For detailed descriptions and precautions, please refer to FSC-BW256B Datasheet .

The simple test of the module only requires connecting VDD/GND/UART_RX/UART_TX to be used.
After drawing the schematic diagram, please send it to Feasycom for review to avoid the Bluetooth or Wi-Fi distance not achieving the best effect.