leakage current nRF52840 GPIO pin P0.17

RE: leakage current nRF52840 GPIO pin P0.17

ErnestoELC — Tue, 13 Jun 2023 11:42:24 GMT

Hi Ketiljo,
Do you know if this information have been officially added to the documentation?
Thanks.

RE: leakage current nRF52840 GPIO pin P0.17

MBAZA — Tue, 01 Nov 2022 08:46:53 GMT

Aah thank you

RE: leakage current nRF52840 GPIO pin P0.17

ketiljo — Tue, 01 Nov 2022 08:22:53 GMT

I'm a Nordic emplyee

RE: leakage current nRF52840 GPIO pin P0.17

MBAZA — Mon, 31 Oct 2022 16:32:40 GMT

ketiljo ??

RE: leakage current nRF52840 GPIO pin P0.17

MBAZA — Wed, 26 Oct 2022 14:12:38 GMT

how did you know it (the source)

RE: leakage current nRF52840 GPIO pin P0.17

ketiljo — Wed, 26 Oct 2022 13:27:06 GMT

Same thing, still >10 Mohm

RE: leakage current nRF52840 GPIO pin P0.17

MBAZA — Wed, 26 Oct 2022 13:15:58 GMT

Yes i agree, but as you see in the datasheet the pin p0.17 you can configure it as an input gpio what about the leakage current in this case ?

RE: leakage current nRF52840 GPIO pin P0.17

ketiljo — Wed, 26 Oct 2022 12:55:27 GMT

The input impedance is >10 Mohm. So in the pA range then.

Curious how this is important? An ADC input is very different from a GPIO when is samples the pin. It will behave like a cap that's being charged when the sampling starts

https://infocenter.nordicsemi.com/topic/ps_nrf52840/saadc.html#concept_using

This has far more impact on the behavior that the leakage current.

Also see this for a reference: Measuring Lithium battery voltage with nRF52

RE: leakage current nRF52840 GPIO pin P0.17

MBAZA — Wed, 26 Oct 2022 12:39:34 GMT

thanks for your response man,
Yes, but we need to know how much (I know it is negligible)

RE: leakage current nRF52840 GPIO pin P0.17

ketiljo — Wed, 26 Oct 2022 11:30:06 GMT

There's no leakage current to be concerned off. The impedance of the pin is several Mohm's.