nRF52 gpio current protection

RE: nRF52 gpio current protection

Håkon Alseth — Wed, 28 Feb 2018 07:43:58 GMT

[quote userid="65138" url="~/f/nordic-q-a/30922/nrf52-gpio-current-protection/122182"]does it cause only voltage drop or it can also damage gpio? [/quote]

The most likely scenario is: Both. Over time, the pin is degraded due to the current consumption through a transistor-net that isn't designed for such a current.

RE: nRF52 gpio current protection

hmolesworth — Tue, 27 Feb 2018 18:20:39 GMT

Voltage drop in my experiences, not actual damage, but switching sufficiently high current can cause a reset - for example, high drive trying to switch high a shorted pin to Gnd.

RE: nRF52 gpio current protection

martin65 — Tue, 27 Feb 2018 18:01:44 GMT

Thanks for the answer but as I wrote in first post I have checked specification and I know max current values. What I don't know is what would happen if I tried to pull more or made short circuit - does it cause only voltage drop or it can also damage gpio?

RE: nRF52 gpio current protection

hmolesworth — Tue, 27 Feb 2018 16:45:49 GMT

See page 155 and 156 of the nRF52832 Product Specification v1.3 which shows current graphs for port pins; other parts have similar specifications (nRF52840, etc) in the specific data sheets