GPIO pin current injection

[Martin Odgaard]

How much current can be injected safely into the various I/O pins of nRF54H20?

To get the desired trigger level, and tolerate a maximum input voltage for the product, I have a voltage divider, where a maximum current of 50 uA can flow into the pin at maximum voltage, if the voltage on the pin is assumed clamped internally by ESD protection diodes.

Will that be OK? (typical values for other MCU's is e.g. 3.5-10 mA).

I can not find any description of this into the datasheet for nRF54H20.

Thanks.

[Turbo J]

Schematic recommended. Description with words can be misleading.

With a current source at a pin you have a problem when the chip is in power saving mode. Once the MCU current was smaller than the injected one, you will see VDD rail rising. If it could go above absolute limits, you would damage the chip that way.

No idea if that is possible in your case - hence the need for a schematic.