Datasheet

ManualsBrandsARDUINO ManualsArduinoMega 2560 Microcontroller Board

The Arduino Mega 2560 is a

microcontroller board based on

the ATmega2560 (datasheet). It

has 54 digital input/output pins

(of which 14 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 is compatible with most shields designed for the Arduino Duemilanove

or Diecimila.

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

The Mega2560 differs from all preceding boards in that it does not use the FTDI USB-to-

serial driver chip. Instead, it features the ATmega16U2 (ATmega8U2 in the revision 1 and

revision 2 boards) programmed as a USB-to-serial converter.

Revision 3 of the board has the following new features:

1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins

placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage

provided from the board. In future, shields will be compatible both with the board that use

the AVR, which operate with 5V and with the Arduino Due that operate with 3.3V. The

second one is a not connected pin, that is reserved for future purposes.

Stronger RESET circuit.

Atmega 16U2 replace the 8U2.

Microcontroller

ATmega2560

Operating Voltage

Input Voltage (recommended)

7-12V

Input Voltage (limits)

6-20V

Digital I/O Pins

54 (of which 15 provide PWM output)

Analog Input Pins

DC Current per I/O Pin

40 mA

DC Current for 3.3V Pin

50 mA

Flash Memory

256 KB of which 8 KB used by bootloader

SRAM

8 KB

EEPROM

4 KB

Clock Speed

16 MHz

The Arduino Mega 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

Summary of content (4 pages)

PAGE 1
The Arduino Mega 2560 is a microcontroller board based on the ATmega2560 (datasheet). It has 54 digital input/output pins (of which 14 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.
PAGE 2
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: VIN.
PAGE 3
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. The Arduino Mega2560 has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. The ATmega2560 provides four hardware UARTs for TTL (5V) serial communication.
PAGE 4
USB). For the following half-second or so, the bootloader is running on the Mega2560. While it is programmed to ignore malformed data (i.e. anything besides an upload of new code), it will intercept the first few bytes of data sent to the board after a connection is opened. If a sketch running on the board receives one-time configuration or other data when it first starts, make sure that the software with which it communicates waits a second after opening the connection and before sending this data.