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
USB VBUS
10
VBUS
S
USB VBUS
11
NC
NC
Not connected
12
NC
NC
Not connected
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
NC
NC
Not connected
17
3V3
S
3.3 V power supply
18
3V3
S
3.3 V power supply
19
I2C1_SDA
I/O
The first set of I2C data signal
20
I2C1_SCL
I/O
The first set of I2C clock signal
21
AIN0
A
Analog input for ADC
22
AIN1
A
Analog input for ADC
23
NC
NC
Not connected
24
NC
NC
Not connected
