Current ratings on GPIO

[Insomniac10102]

I'm trying to figure out how much current is coming from the GPIO on olinuxino a20 (and a20 SOM, for that matter.) I checked the manual and couldn't find anything.

[JohnS]

I hope you mean the maximum that can be supplied.  See the datasheet as it's in there.

I don't think the total is, but expect "not much" unless you fit a good heatsink in which case go for "somewhat more".

Do not fail to use resistors (or the like) to limit the current or expect a dead pin/chip.

John

[Insomniac10102]

Oh, durr. Thanks John, I think I get it now. I'll take another look through and see what I can find.

[martinayotte]

You can easily add some drivers such ULN2003 or ULN2803, this will provide strong outputs which can drive things such relays.