IO Pull-up vs Pull-down consumption

[Jose Xavier]

What does consume more power, IO pull-up or IO pull-down? Didn't find information about this on the product specification.

[Stefan Birnir Sverrisson]

Hi Jose

According to nRF51822 PS v3.1 section 8.23 pullup and pulldown resistors have a typical value of 13kohm. Therefore, if you have e.g. a button that connects a certain pin to ground when pressed, and the pin is configured as input with pullup, and you have supply power of 3.0 volts for the nRF51, then the current consumption is 3/13k=230uA when the button is pressed.

[michaeld]

Thanks for you respone. RK found a solution it had to with my pin configuration. I overwrote the GPIOTE config when setting the pin to no pull for testing. See the post here: devzone.nordicsemi.com/.../

But your idea is pretty good to make a circuit with a short pulse to save even more power. Thanks!