Voltage drop on GPIO pins at higher loads

RE: Voltage drop on GPIO pins at higher loads

ketiljo — Wed, 31 May 2023 10:31:02 GMT

Yes, the resistance is the same on the same device It's not stated in the datasheet. It will vary with chip to chip and temperature.

RE: Voltage drop on GPIO pins at higher loads

Jon — Wed, 31 May 2023 09:24:57 GMT

Alright, that's good to know. So can I expect the voltage to drop linearly in relation to the current? Can I see somewhere in the datasheet what typical values for the resistances in the GPIOs are?

RE: Voltage drop on GPIO pins at higher loads

ketiljo — Wed, 31 May 2023 08:07:19 GMT

There will be some voltage drop in the GPIO depending on the current draw. When you draw a current of 5 mA in high drive wuth 2.7 V supply voltage, you can expect a max voltage drop of 0.4 V.

This is because the GPIO internal resistance.