GPIOs voltage level on nRF51822

[Nixon Gheorghe]

Hi!

I wonder what is the GPIOs nominal voltage level when I'm using the internal DC/DC converter? I know that the internal DC/DC converter output voltage is 1,9V but I'm not sure if the GPIOs are supplied with the converter voltage 1,9V or from VDD voltage which in my case is 3V from a coin-cell.
Hope for a quick answer. :)

Best regards, Nixon

[Stefan Birnir Sverrisson]

Hi

When DCDC enabled, the GPIO output high voltage will still be VDD. More specifically, between VDD-0.3 and VDD as specified in section 8.23 in the nRF51822 Product Specification.