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The Arduino Due is a microcontroller board based on the Atmel SAM3X8E ARM CortexM3 CPU (datasheet). It is the first Arduino board based on a 32bit ARM core microcontroller. It has 54 digital input/output pins (of which 12 can be used as PWM outputs) 12 analog inputs 4 UARTs (hardware serial ports) a 84 MHz clock an USB OTG capable connection 2 DAC (digital to analog) 2 TWI a power jack an SPI header a JTAG header a reset button and an erase button.
Warning: 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 microUSB cable or power it with a ACtoDC adapter or battery to get started. 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 AVRbased boards which operate at 5V.
- An unconnected pin reserved for future use.