Arduino Due là một bo mạch vi điều khiển dựa trên CPU Atmel SAM3X8E ARM Cortex-M3. Đây là bo mạch Arduino đầu tiên dựa trên bộ vi điều khiển lõi ARM 32 bit. Nó có 54 chân Digital Input/Output (trong đó 12 chân có thể được sử dụng làm đầu ra PWM), 12 đầu vào analog, 4 UART (Hardware Serial Ports), xung nhịp 84 MHz, có khả năng kết nối USB OTG, 2 DAC (Digital to Analog) , 2 TWI, Jack nguồn, SPI Header, JTAG Header, Reset Button và Erase Button.
Warning: Không giống như hầu hết các bo mạch Arduino, bo mạch Arduino Do chạy ở mức điện áp 3,3V. Điện áp tối đa mà các chân I/O có thể chịu được là 3,3V. Đặt điện áp cao hơn 3,3V vào bất kỳ chân I/O nào có thể làm hỏng bo mạch.
Bo mạch có mọi thứ cần thiết để hỗ trợ vi điều khiển; chỉ cần kết nối nó với máy tính bằng cáp micro-USB hoặc cấp nguồn cho nó bằng bộ chuyển đổi AC-to-DC hoặc PIN dự phòng để bắt đầu. Do tương thích với tất cả các Arduino Shield hoạt động ở mức 3,3V và tương thích với sơ đồ chân Arduino 1.0.
The Due follows the 1.0 pinout:
|Input Voltage (recommended)||7-12V|
|Input Voltage (limits)||6-16V|
|Digital I/O Pins||54 (of which 12 provide PWM output)|
|Analog Input Pins||12|
|Analog Output Pins||2 (DAC)|
|Total DC Output Current on all I/O lines||130 mA|
|DC Current for 3.3V Pin||800 mA|
|DC Current for 5V Pin||800 mA|
|Flash Memory||512 KB all available for the user applications|
|SRAM||96 KB (two banks: 64KB and 32KB)|
|Clock Speed||84 MHz|
Arduino Due is open-source hardware! You can build your own board using the following files:
Download the full pinout diagram as PDF here.
Bạn có thể tìm thấy trong phần Getting Started with Arduino Due tất cả thông tin bạn cần để định cấu hình các chân Pinout, sử dụng phần mềm Arduino (IDE) để bắt đầu code và nạp code cho ứng dụng của mình.
The Arduino 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 a 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 6 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable. If using more than 12V, the voltage regulator may overheat and damage the board. The recommended range is 7 to 12 volts.
The power pins are as follows:
The SAM3X has 512 KB (2 blocks of 256 KB) of flash memory for storing code. The bootloader is burned in a factory from Atmel and is stored in a dedicated ROM memory. The available SRAM is 96 KB in two contiguous banks 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.
The AREF pin is connected to the SAM3X analog reference pin through a resistor bridge. To use the AREF pin, resistor BR1 must be desoldered from the PCB.
Please note that the DAC output range is actually from 0.55 V to 2.75 V only.
Other pins on the board:
See also the mapping between Arduino pins and SAM3X ports:
The Arduino Due has a number of facilities for communicating with a computer, another Arduino or other microcontrollers, and different devices like phones, tablets, cameras, and so on. The SAM3X provides one hardware UART and three hardware USARTs for TTL (3.3V) serial communication.
The Programming port is connected to an ATmega16U2, which provides a virtual COM port to software on a connected computer (To recognize the device, Windows machines will need a .inf file, but OSX and Linux machines will recognize the board as a COM port automatically). The 16U2 is also connected to the SAM3X hardware UART. Serial on pins RX0 and TX0 provides Serial-to-USB communication for programming the board through the ATmega16U2 microcontroller. The Arduino software includes a serial monitor which allows simple textual data to be sent to and from the board. The RX and TX LEDs on the board will flash when data is being transmitted via the ATmega16U2 chip and USB connection to the computer (but not for serial communication on pins 0 and 1).
The Native USB port is connected to the SAM3X. It allows for serial (CDC) communication over USB. This provides a serial connection to the Serial Monitor or other applications on your computer. It also enables the Due to emulate a USB mouse or keyboard to an attached computer. To use these features, see the Mouse and Keyboard library reference pages.
The Native USB port can also act as a USB host for connected peripherals such as mice, keyboards, and smartphones. To use these features, see the USBHost reference pages.
The SAM3X also supports TWI and SPI communication. The Arduino software includes a Wire library to simplify the use of the TWI bus; see the documentation for details. For SPI communication, use the SPI library.
Uploading sketches to the SAM3X is different than the AVR microcontrollers found in other Arduino boards because the flash memory needs to be erased before being re-programmed. Upload to the chip is managed by ROM on the SAM3X, which is run only when the chip's flash memory is empty.
Either of the USB ports can be used for programming the board, though it is recommended to use the Programming port due to the way the erasing of the chip is handled :
Unlike other Arduino boards which use Avrdude for uploading, the Due relies on bossac. The ATmega16U2 firmware source code is available in the Arduino repository. You can use the ISP header with an external programmer (overwriting the DFU bootloader). See this user-contributed tutorial for more information.
The Arduino Due has a resettable polyfuse that protects your computer's USB ports from shorts and overcurrent. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed.
The maximum length and width of the Arduino Due PCB are 4 and 2.1 inches respectively, with the USB connectors and power jack extending beyond the former dimension. Three screw holes allow the board to be attached to a surface or case. Note that the distance between digital pins 7 and 8 is 160 mil (0.16"), not an even multiple of the 100 mil spacing of the other pins.
The Arduino Due is designed to be compatible with most shields designed for the Uno, Diecimila, or Duemilanove. Digital pins 0 to 13 (and the adjacent AREF and GND pins), analog inputs 0 to 5, the power header, and the "ICSP" (SPI) header are all in equivalent locations. Further, the main UART (serial port) is located on the same pins (0 and 1). Please note that I2C is not located on the same pins on the Due (20 and 21) as the Duemilanove / Diecimila (analog inputs 4 and 5).