There are a few threads here regarding powering various up devices via the 40-pin connector.
if we power the device via the 40pin connector do we need to supply both 3.3 and 5v? or just 5v?
Hi @Eric ,
I am not sure if I understand your question but I think the power depends on your device specifications.
Maybe that discussion could help you:
No, you don't need to supply 3.3V; just put 5V on pins 2 and 4 and the on-board regulators will derive the needed 3.3V from there.