Documentation Center
Pin
Number
Pin Name
Type
Description
1
VBAT
S
Power supply from battery
2
VBAT
S
Power supply from battery
3
GND
S
Ground
4
GND
S
Ground
5
3V3
S
3.3 V power supply
6
3V3
S
3.3 V power supply
7
USB+
I/O
USB D+
8
USB–
I/O
USB D–
9
VBUS
S
VBUS for USB
10
SW1
I/O
Switch signal for customer's control
11
TXD0
I/O
MCU UART0 TX signal
12
RXD0
I/O
MCU UART0 RX signal
13
RESET
I
Connected to the reset switch, for MCU reset
14
LED1
I/O
LED for battery charging indication
15
LED2
I/O
LED for custom usage
16
LED3
I/O
LED for custom usage
17
VDD
S
Generated by MCU module for power sensor board if the MCU IO
level is not 3.3 V
18
VDD
S
Generated by MCU module for power sensor board if the MCU IO
level is not 3.3 V
19
I2C1_SDA
I/O
The first set of I2C data signal
20
I2C1_SCL
I/O
The first set of I2C clock signals
21
AIN0
A
Analog input for ADC
22
AIN1
A
Analog input for ADC
23
BOOT0
I
For ST MCU, set high when reset. The MCU will allow you to enter
boot mode.
