nrf51822 gpio pins have clamping diode?

[Rushd]

Does nrf51822 gpio pin has clamping diode on it? if yes then how much current can the clamping diode sustain for long periods?

[MartinBL]

Hi

Yes the GPIOs have clamping diodes. However, we usually don't want to go into discussions on how to operate our devices outside recommended operating conditions. I urge you to stay within maximum ratings e.g. by adding zener diodes, level shifters or resistor bridges to keep the voltages within limits.

If you intend to use the GPIO pins as ADCs then you can find a relevant post on devzone here: What is the maximum current through clamping diodes in nRF51822?

[MartinBL]

This is not something we have tested so we will not provide any numbers.