Data Sheet
Orangepip Mega2560
Arduino Mega2560
Compatible Development Board
Order code: 75-0551
www.orangepipboards.com
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is 160 mil (0.16”), not an even multiple of the 100 mil spacing
of the other pins.
The Mega2560 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 ICSP header
are all in equivalent locations. Further the main UART (serial
port) is located on the same pins (0 and 1), as are external
interrupts 0 and 1 (pins 2 and 3 respectively). SPI is available
through the ICSP header on both the Mega2560
and Duemilanove/Diecimila.
Please note that I
2
C is not located on the same pins on
the Mega (20 and 21) as the Duemilanove / Diecimila
(analog inputs 4 and 5).
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 rst few bytes of data sent
to the board after a connection is opened. If a sketch running
on the board receives one-time conguration or other data
when it rst starts, make sure that the software with which
it communicates waits a second after opening the connection
and before sending this data.
The Mega2560 contains a trace that can be cut to disable
the auto-reset. The pads on either side of the trace can be
soldered together to re-enable it. It’s labeled “RESET-EN”.
You may also be able to disable the auto-reset by connecting
a 110 ohm resistor from 5V to the reset line.
USB Overcurrent Protection
The Orangepip Mega2560 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.
Physical Characteristics and Shield Compatibility
The maximum length and width of the Mega2560 PCB are
4 and 2.1 inches respectively, with the USB connector 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