NoticeIteaduino DUE
Contents
Overview
Iteaduino DUE is a microcontroller board based on the Atmel SAM3X8E ARM Crotex-M3 core. It is the improvement board based on the Arduino DUE. It has 54 digital IO pins, 12 analog inputs, 4 UARTs, a 84MHz clock, an USB OTG capable connection, 2 DACs, 2 IIC, a power jack, an SPI header, a reset button and an erase button.
Warning: Unlike other Iteadduino boards, the Iteaduino Due board runs at 3.3V. The maximum voltage that the I/O pins can tolerate is 3.3V. Providing higher voltages, like 5V to an 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 it with a AC-to-DC adapter or battery to get started. The Due is compatible with all Arduino compatible shields that work at 3.3V and are compliant with the 1.0 Arduino compatible pinout.
The Due follows the 1.0 pinout:
TWI: SDA and SCL pins that are near to the AREF pin.
The IOREF pin which 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.
ARM Core benefits
The Due has a 32-bit ARM core that can outperform typical 8-bit microcontroller boards. The most significant differences are:
A 32-bit core, that allows operations on 4 bytes wide data within a single CPU clock.
CPU Clock at 84Mhz.
96 KBytes of SRAM.
512 KBytes of Flash memory for code.
A DMA controller, that can relieve the CPU from doing memory intensive tasks.
Spec
| Microcontroller | AT91SAM3X8E |
| Operating Voltage | 3.3V |
| POWER Supply Voltage(recommanded) | 7~24V |
| Power supply Max Voltage | 26V |
| Digital IO pins | 54(of which 12 provide PWM output) |
| Analog Input pins(ADC) | 12 |
| Analog Output pins(DAC) | 2 |
| Total DC Output current on all IO lines | 130mA |
| DC current of 3.3V | 800mA |
| DC current of 5V | 800mA |
| Flash Memory | 512KB all available for user application |
| SRAM | 96KB(2 banks:64KB and 32KB) |
| Clock frequency | 84MHz |
Hardware top view
Pin map
| Due Pin Number | SAM3X Pin Name | Mapped Pin Name |
| 0 | PA8 | RX0 |
| 1 | PA9 | TX0 |
| 2 | PB25 | Digital Pin 2 |
| 3 | PC28 | Digital Pin 3 |
| 4 | connected to both PA29 and PC26 | Digital Pin 4 |
| 5 | PC25 | Digital Pin 5 |
| 6 | PC24 | Digital Pin 6 |
| 7 | PC23 | Digital Pin 7 |
| 8 | PC22 | Digital Pin 8 |
| 9 | PC21 | Digital Pin 9 |
| 10 | connected to both PA28 and PC29 | Digital Pin 10 |
| 11 | PD7 | Digital Pin 11 |
| 12 | PD8 | Digital Pin 12 |
| 13 | PB27 | Digital Pin 13 / Amber LED "L" |
| 14 | PD4 | TX3 |
| 15 | PD5 | RX3 |
| 16 | PA13 | TX2 |
| 17 | PA12 | RX2 |
| 18 | PA11 | TX1 |
| 19 | PA10 | RX1 |
| 20 | PB12 | SDA |
| 21 | PB13 | SCL |
| 22 | PB26 | Digital Pin 22 |
| 23 | PA14 | Digital Pin 23 |
| 24 | PA15 | Digital Pin 24 |
| 25 | PD0 | Digital Pin 25 |
| 26 | PD1 | Digital Pin 26 |
| 27 | PD2 | Digital Pin 27 |
| 28 | PD3 | Digital Pin 28 |
| 29 | PD6 | Digital Pin 29 |
| 30 | PD9 | Digital Pin 30 |
| 31 | PA7 | Digital Pin 31 |
| 32 | PD10 | Digital Pin 32 |
| 33 | PC1 | Digital Pin 33 |
| 34 | PC2 | Digital Pin 34 |
| 35 | PC3 | Digital Pin 35 |
| 36 | PC4 | Digital Pin 36 |
| 37 | PC5 | Digital Pin 37 |
| 38 | PC6 | Digital Pin 38 |
| 39 | PC7 | Digital Pin 39 |
| 40 | PC8 | Digital Pin 40 |
| 41 | PC9 | Digital Pin 41 |
| 42 | PA19 | Digital Pin 42 |
| 43 | PA20 | Digital Pin 43 |
| 44 | PC19 | Digital Pin 44 |
| 45 | PC18 | Digital Pin 45 |
| 46 | PC17 | Digital Pin 46 |
| 47 | PC16 | Digital Pin 47 |
| 48 | PC15 | Digital Pin 48 |
| 49 | PC14 | Digital Pin 49 |
| 50 | PC13 | Digital Pin 50 |
| 51 | PC12 | Digital Pin 51 |
| 52 | PB21 | Digital Pin 52 |
| 53 | PB14 | Digital Pin 53 |
| 54 | PA16 | Analog In 0 |
| 55 | PA24 | Analog In 1 |
| 56 | PA23 | Analog In 2 |
| 57 | PA22 | Analog In 3 |
| 58 | PA6 | Analog In 4 |
| 59 | PA4 | Analog In 5 |
| 60 | PA3 | Analog In 6 |
| 61 | PA2 | Analog In 7 |
| 62 | PB17 | Analog In 8 |
| 63 | PB18 | Analog In 9 |
| 64 | PB19 | Analog In 10 |
| 65 | PB20 | Analog In 11 |
| 66 | PB15 | DAC0 |
| 67 | PB16 | DAC1 |
| 68 | PA1 | CANRX |
| 69 | PA0 | CANTX |
| 70 | PA17 | SDA1 |
| 71 | PA18 | SCL2 |
| 72 | PC30 | LED "RX" |
| 73 | PA21 | LED "TX" |
| 74 | PA25 | (MISO) |
| 75 | PA26 | (MOSI) |
| 76 | PA27 | (SCLK) |
| 77 | PA28 | (NPCS0) |
| 78 | PB23 | (unconnected) |
| USB | PB11 | ID |
| USB | PB10 | VBOF |
Power
Iteaduino Due can be powered via the USB connector or with an external power supply. The power source is selected automatically.
External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The adapter can be connected by plugging a 2.1mm center-positive plug into the board's power jack. Leads from a battery can be inserted in the GND and Vin pin headers of the POWER connector.
The board can operate on an external supply of 7 to 24 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable.
The power pins are as follows:
- VIN. The input voltage to the Iteaduino board when it's using an external power source (as opposed to 5 volts from the USB connection or other regulated power source). You can supply voltage through this pin, or if supplying voltage via the power jack, access it through this pin.
- 5V. This pin outputs a regulated 5V from the regulator on the board. The board can be supplied with power either from the DC power jack (7 - 24V), the USB connector (5V), or the VIN pin of the board (7-24V). Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board. We don't advise it.
- 3.3V. A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 800 mA. This regulator also provides the power supply to the SAM3X microcontroller.
- GND. Ground pins.
- IOREF. This pin on the Arduino board provides the voltage reference with which the microcontroller operates. A properly configured shield can read the IOREF pin voltage and select the appropriate power source or enable voltage translators on the outputs for working with the 5V or 3.3V.
Memory
The SAM3X has 512 KB (2 blocks of 256 KB) of flash memory for storing code. The bootloader is preburned in factory from Atmel and is stored in a dedicated ROM memory. The available SRAM is 96 KB in two contiguous bank of 64 KB and 32 KB. All the available memory (Flash, RAM and ROM) can be accessed directly as a flat addressing space.
It is possible to erase the Flash memory of the SAM3X with the onboard erase button. This will remove the currently loaded sketch from the MCU. To erase, press and hold the Erase button for a few seconds while the board is powered.
