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### Topic: Arduino MEGA Pinout Diagram (Read 125707 times)previous topic - next topic

#### xl97

#15
##### Feb 04, 2013, 02:24 am
Suggestion:

once you are done.. create a post/thread that has all your work collectively posted?

(maybe even a sticky once done?)

#16
##### Feb 04, 2013, 02:37 am
Current totals follow the current allowed by the different ports.

3. Although each I/O port can sink more than the test conditions (20mA at VCC = 5V, 10mA at VCC = 3V) under steady state
conditions (non-transient), the following must be observed:

ATmega640/1280/2560:
1.)The sum of all IOL, for ports J0-J7, A0-A7, G2 should not exceed 200 mA.
2.)The sum of all IOL, for ports C0-C7, G0-G1, D0-D7, L0-L7 should not exceed 200 mA.
3.)The sum of all IOL, for ports G3-G4, B0-B7, H0-B7 should not exceed 200 mA.
4.)The sum of all IOL, for ports E0-E7, G5 should not exceed 100 mA.
5.)The sum of all IOL, for ports F0-F7, K0-K7 should not exceed 100 mA.
If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater
than the listed test condition.

That totals 800mA. There is nothing that says if you draw 200mA in one group that you then can't draw it in another.
So this thinking of only 200mA total is nonsense.

Similar numbers apply to the 328 & 1284.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

#### retrolefty

#17
##### Feb 04, 2013, 03:01 amLast Edit: Feb 04, 2013, 03:06 am by retrolefty Reason: 1
Quote
That totals 800mA. There is nothing that says if you draw 200mA in one group that you then can't draw it in another.
So this thinking of only 200mA total is nonsense.

LOL, we've had this same discussion before.

Quote
There is nothing that says if you draw 200mA in one group that you then can't draw it in another.

There is also nothing stating that you can take the sum, of all those individual port limits, as the maxiumum chip current draw limit. And no where in the datasheet does it state that 800 ma of total current draw is allowed. And of course as I've stated before the absolute maximum section lists the 200 ma figure. Why would they state 200ma there if it only applied to one port? Your assumption, and it is just an assumption, is in error, IMHO.

But that is why I would like others to comment on the subject, as you and I. while still respectful of each other's opinion, have not been able to come to consensus on the matter now or in the past.

Lefty

#18
##### Feb 04, 2013, 04:53 am
They state the Vcc and Gnd PinS are 200mA. Do you suppose they use wimpier wire in a 2560 vs a 328 so that only 200mA is allowed? I think not.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

#### pighixxx

#19
##### Feb 04, 2013, 01:38 pm
ATMega 2560 Pinout is on line on first post.
New version of Arduino MEGA.

#### pighixxx

#20
##### Feb 04, 2013, 01:45 pm

Suggestion:

once you are done.. create a post/thread that has all your work collectively posted?

(maybe even a sticky once done?)

Shortly I make a collection...
...and a big poster

#### pighixxx

#21
##### Feb 04, 2013, 01:47 pm

Hello!

May I would suggest to add the PIN numbers as they are printed on the PCB (you did this on the UNO Reference), this would be easier to use if you donĀ“t screw your Arduino to the printout

Matthias

Thanks!
As soon as I have some time.

#### mmcp42

#22
##### Feb 04, 2013, 02:18 pm
excellent stuff
well done, sir!
there are only 10 types of people
them that understands binary
and them that doesn't

#### pighixxx

#23
##### Feb 05, 2013, 05:22 pmLast Edit: Feb 06, 2013, 09:36 am by pighixxx Reason: 1
A new version is online.

#### vrajesh

#24
##### Feb 07, 2013, 07:17 pm
This is really beautiful work. Thanks for taking time to do this.

#25
Thanks again!

#### Sergegsx

#26
##### Feb 12, 2013, 02:23 pm
Really nice and amazing work ! congrats !

Thank you very much for sharing this.

#### sjoerdp

#27
##### Feb 14, 2013, 10:49 pm
Nice work! And not only for a beginner

#### baselsw

#28
##### Feb 14, 2013, 11:05 pm
Wow, love your work! Printing this out as we speak (as reference when using my home made mega)! Thank you mate!!

#### kd7eir

#29
##### Feb 22, 2013, 04:45 pm
Thank you very much!
Any plans to work on other variants of the Mega2560 such as the Seeeduino Mega that break out the extra pins?

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