Arduino Due Microcontroller Board

The Arduino Due is based on the Atmel SAM3X8E ARM Cortex-M3 CPU with 54 digital input/output pins, and 12 analog inputs. The Due has 54 digital input/output pins, of which 12 can be used as PWM outputs. The Due also has 12 analog inputs, 4 UARTs (hardware serial ports), a 84MHz clock, an USB OTG capable connection, 2 DAC (Digital-to-Analog Converters), 2 TWI, a power jack, an SPI header, a JTAG header, a reset button, and an erase button.

Unlike most Arduino boards, the Arduino Due board runs at 3.3V. The maximum voltage that the I/O pins can tolerate is 3.3V. Applying voltages higher than 3.3V to any I/O pin could damage the board.

The board contains everything needed to support the microcontroller. Simply connect it to a computer with a micro-USB cable or power with an AC-to-DC adapter or battery. The Due is compatible with all Arduino shields that work at 3.3V and are compliant with the 1.0 Arduino pinout.

The Due follows the 1.0 pinout:

TWI: SDA and SCL pins that are near to the AREF pin.
IOREF: allows an attached shield with the proper configuration to adapt to the voltage provided by the board. This enables shield compatibility with a 3.3V board like the Due and AVR-based boards which operate at 5V.
An unconnected pin, reserved for future use.