A000067

A000067 Datasheet


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The MEGA 2560 is designed for more complex projects. With 54 digital I/O pins, 16 analog inputs and a larger space for your sketch it is the recommended board for 3D printers and robotics projects. This gives your projects plenty of room and opportunities.
• The Arduino Mega 2560 is a microcontroller board based on the ATmega2560. It has 54 digital input/output pins of which 15 can be used as PWM outputs , 16 analog inputs, 4 UARTs hardware serial ports , a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. The Mega 2560 board is compatible with most shields designed for the Uno and the former boards Duemilanove or Diecimila.

The Mega 2560 is an update to the Arduino Mega, which it replaces

Microcontroller Operating Voltage Input Voltage recommended Input Voltage limit Digital I/O Pins Analog Input Pins DC Current per I/O Pin DC Current for 3.3V Pin Flash Memory SRAM EEPROM Clock Speed LED_BUILTIN Length Width Weight

ATmega2560 5V 54 of which 15 provide PWM output 16 20 mA 50 mA 256 KB of which 8 KB used by bootloader 8 KB 4 KB 16 MHz 13 mm 37 g
• Programming

The Mega 2560 board can be programmed with the Arduino Software IDE . For details, see thereference and tutorials.

The ATmega2560 on the Mega 2560 comes preprogrammed with a bootloader that allows you to upload new code to it without the use of an external hardware programmer. It communicates using the original STK500 protocol reference, C header files .

You can also bypass the bootloader and program the microcontroller through the ICSP In-Circuit Serial Programming header using Arduino ISP or similar see these instructions for details.

Warnings

The Mega 2560 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.

Power

The Mega 2560 can be powered via the USB connection 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 6 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may become 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:
• Vin. The input voltage to the 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 12V , the USB connector 5V , or the VIN pin of the board Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board. We don't advise it.
• 3V3. A volt supply generated by the regulator. Maximum current draw is 50 mA.
• GND. Ground pins.
• IOREF. This pin on the 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 ATmega2560 has 256 KB of flash memory for storing code of which 8 KB is used for the bootloader , 8 KB of SRAM and 4 KB of EEPROM which can be read and written with the EEPROM library .

Input and Output

See the mapping between Arduino pins and Atmega2560 ports:

PIN MAPPING ATmega2560

Each of the 54 digital pins on the Mega can be used as an input or output, using pinMode ,digitalWrite , and digitalRead functions. They operate at 5 volts. Each pin can provide or receive 20 mA as recommended operating condition and has an internal pull-up resistor disconnected by default of 20-50 k ohm. A maximum of 40mA is the value that must not be exceeded to avoid permanent damage to the microcontroller.

In addition, some pins have specialized functions:
• Serial 0 RX and 1 TX Serial 1 19 RX and 18 TX Serial 2 17 RX and 16 TX Serial 3 15 RX and 14 TX . Used to receive RX and transmit TX TTL serial data. Pins 0 and 1 are also connected to the corresponding pins of the ATmega16U2 Serial chip.
• External Interrupts 2 interrupt 0 , 3 interrupt 1 , 18 interrupt 5 , 19 interrupt 4 , 20 interrupt 3 , and 21 interrupt These pins can be configured to trigger an interrupt on a low level, a rising or falling edge, or a change in level. See the attachInterrupt function for details.
• PWM 2 to 13 and 44 to Provide PWM output with the analogWrite function.
• SPI 50 MISO , 51 MOSI , 52 SCK , 53 SS . These pins support SPI communication using
theSPI library. The SPI pins are also broken out on the ICSP header, which is physically compatible with the Arduino /Genuino Uno and the old Duemilanove and Diecimila Arduino boards.
• LED There is a LED connected to digital pin When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.
• TWI 20 SDA and 21 SCL . Support TWI communication using the Wire library. Note that these pins are not in the same location as the TWI pins on the old Duemilanove or Diecimila Arduino boards.

See also the mapping Arduino Mega 2560 PIN diagram.

The Mega 2560 has 16 analog inputs, each of which provide 10 bits of resolution i.e. 1024 different values . By default they measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and analogReference function. There are a couple of other pins on the board:
• AREF. Reference voltage for the analog inputs. Used with analogReference .
• Reset. Bring this line LOW to reset the microcontroller. Typically used to add a reset
button to shields which block the one on the board.

Communication

A SoftwareSerial library allows for serial communication on any of the Mega 2560's digital pins.

The Mega 2560 also supports TWI and SPI communication. The Arduino Software IDE includes a Wire library to simplify use of the TWI bus see the documentation for details. For SPI communication, use the SPI library.
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Datasheet ID: A000067 518300