Thông số kỹ thuật:

No.	Pin Name	Pin direction	Pin use
1	GND	-	ground wire, connected to the power reference
2	VCC	-	Power supply, range 2.5V to 3.7V(ceramic filter capacitor is recommended externally)
3	SETB	-	Wake-up pins with low power
4	DIO1	Input/output	NC(reserve pin)
5	BUSY	Input/output	NC(reserve pin)
6	I2C_SDA	Input/output	NC(reserve pin)
7	I2C_SCL	Input/output	NC(reserve pin)
8	UART_CTS	Input/output	NC(reserve pin)
9	UART_RTS	Input/output	NC(reserve pin)
10	GND	-	ground wire, connected to the power reference
11	ANT	-	Antenna interface, stamp hole(50 ohm characteristic impedance)
12	GND	-	ground wire, connected to the power reference
13	GND	-	ground wire, connected to the power reference
14	GND	-	ground wire, connected to the power reference
15	GND	-	ground wire, connected to the power reference
16	XRES	Input	The external reset pin
17	ADC_IN	Input	NC(reserve pin)
18	AUX	Input/output	NC(reserve pin)
19	SETA	Input/output	NC(reserve pin)
20	UART_RX	Input/output	UART RX pin
21	UART_TX	Input/output	UART TX pin
22	SWD_DATA	Input/output	SWD Data pin
23	SWD_CLK	Input/output	SWD Clock pin
24	GND	-	ground wire, connected to the power reference
25	SPI_MISO	Input/output	The SPI MISO test point, which is internally connected and cannot be used as an external SPI
26	SPI_NSS	Input/output	The SPI NSS test point, which is internally connected and cannot be used as an external SPI
27	SPI_MOSI	Input/output	The SPI MOSI test point, which is internally connected and cannot be used as an external SPI
28	SPI_SCK	Input/output	The SPI SCK test point, which is internally connected,cannot be used as an external SPI