Product Data Sheet

3
AREF
Analog
Analog Reference; can be used as GPIO
4
A0/DAC0
Analog
ADC in/DAC out; can be used as GPIO
5
A1
Analog
ADC in; can be used as GPIO
6
A2
Analog
ADC in; can be used as GPIO
7
A3
Analog
ADC in; can be used as GPIO
8
A4/SDA
Analog
ADC in; I
2
C SDA; Can be used as GPIO (1)
9
A5/SCL
Analog
ADC in; I
2
C SCL; Can be used as GPIO (1)
10
A6
Analog
ADC in; can be used as GPIO
11
A7
Analog
ADC in; can be used as GPIO
12
V
USB
Power In/Out
Normally NC; can be connected to V
USB
pin of the USB
connector by shorting a jumper
13
RST
Digital In
Active low reset input (duplicate of pin 18)
14
GND
Power
Power Ground
15
VIN
Power In
Vin Power input
16
TX
Digital
USART TX; can be used as GPIO
17
RX
Digital
USART RX; can be used as GPIO
18
RST
Digital
Active low reset input (duplicate of pin 13)
19
GND
Power
Power Ground
20
D2
Digital
GPIO
21
D3/PWM
Digital
GPIO; can be used as PWM
22
D4
Digital
GPIO
23
D5/PWM
Digital
GPIO; can be used as PWM
24
D6/PWM
Digital
GPIO, can be used as PWM
25
D7
Digital
GPIO
26
D8
Digital
GPIO
27
D9/PWM
Digital
GPIO; can be used as PWM