Arduino Due - Boards 26-Pin Header Connector

Arduino® Due
18 / 27 Arduino® Due Modified: 14/06/2024
6.5.5 Board's 26-Pin Header Connector
The 26-pin header connector on the Arduino Due offers a comprehensive set of interfaces and versatile pins crucial
for diverse applications
These pins offer a range of functionalities, including digital input/output, serial communication, PWM (Pulse Width
Modulation) outputs, and I2C (Inter-Integrated Circuit) communication.
Pin Function Type Description
1 D21/SCL1 Digital GPIO 21 / I2C 1 Clock
2 D20/SDA1 Digital GPIO 20 / I2C 1 Dataline
3 AREF Digital Analog Reference Voltage
4 GND Power Ground
5 D13/SCK Digital GPIO 13 / SPI Clock (PWM~)
6 D12/CIPO Digital GPIO 12 / SPI Controller In Peripheral Out (PWM~)
7 D11/COPI Digital GPIO 11 / SPI Controller Out Peripheral In (PWM~)
8 D10/CS Digital GPIO 10 / SPI Chip Select (PWM~)
9 D9/SDA2 Digital GPIO 9 / I2C 2 Dataline (PWM~)
10 D8/SCL2 Digital GPIO 8 / I2C 2 Clockline (PWM~)
11 D7 Digital GPIO 7 (PWM~)
12 D6 Digital GPIO 6 (PWM~)
13 D5 Digital GPIO 5 (PWM~)
14 D4 Digital GPIO 4 (PWM~)
15 D3 Digital GPIO 3 (PWM~)
16 D2 Digital GPIO 2 (PWM~)
17 D1/TX0 Digital GPIO 1 / Serial 0 Transmitter
18 D0/TX0 Digital GPIO 0 / Serial 0 Receiver
19 D14/TX3 Digital GPIO 14 / Serial 3 Transmitter
20 D15/RX3 Digital GPIO 15 / Serial 3 Receiver
21 D16/TX2 Digital GPIO 16 / Serial 2 Transmitter
22 D17/RX2 Digital GPIO 17 / Serial 2 Receiver
23 D18/TX1 Digital GPIO 18 / Serial 1 Transmitter
24 D19/RX1 Digital GPIO 19 / Serial 1 Receiver
25 D20/SDA Digital GPIO 20 / I2C 0 Dataline
26 D21/SCL Digital GPIO 21 / I2C 0 Clock
Board's 26-Pin Header pinout