Power & Source of Big Ideas

Max current via SYS_3.3V pin of NanoPi Duo 2

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what is the maximum current I can draw from the SYS_3.3V pin?

According to http://wiki.friendlyarm.com/wiki/index.php/NanoPi_Duo2 the maximum current for gpios is only 5mA but I guess it should be possible to draw higher currents from the SYS_3.3V pin?
How much current do you need to draw for your external devices?

The schematic will have the IC that provides the 3.3V so you can check this and guess at the power available.

I would say that for anything more than 100mA you should use an external 3.3V regulator.

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