Protection diodes on NRF52832: max current

[Bwalker]

I'm developing an application using the NRF52832. Im using the ADC, and there may be times where the NRF52832 has 0V on its supply pin, but the voltage on the ADC pin is nonzero. I plan to put a resistor in series with the ADC input to limit the current through the protection diodes, so my question is, what current are these diodes rated for? I know that for most AVR devices, the limit is 1mA, but I assume it's lower for nordic?

[AmbystomaLabs]

The ESD diodes really don't apply for this scenario.  Unless you mean to imply in your schematic that nRF Vdd is actually grounded?

Normally people refer to a situation where nRF Vdd is unconnected or high impedance to the supply, then the only current flow will be due to the top FET in the cmos output stage being reverse biased due to no Vdd and will short your external voltage source through to nRF Vdd. The effect will be as if your external source is powering the nRF.

[Bwalker]

Yes, the VDD is effectively grounded (low impedance) in this scenario.