nRF52832 battery powered rise time issue

RE: nRF52832 battery powered rise time issue

OllieJ — Wed, 16 Sep 2020 17:50:05 GMT

So it's only solvable in hardware. Unfortunately we have to add an own POR circuit.

Thanks!

RE: nRF52832 battery powered rise time issue

ketiljo — Tue, 15 Sep 2020 11:52:04 GMT

You need to apply a pin reset or power cycle the device in case it hangs in POR.

But as Turbo J say, discharging a lithium cell this far is potentially dangerous so you need to add low voltage protection.

RE: nRF52832 battery powered rise time issue

OllieJ — Tue, 15 Sep 2020 10:34:31 GMT

We are aware that it is not allowed to discharge so deeply but in our application it can happen very very occasionally when misused.

I guess that there are also applications with NiMh packs that will be fully discharged. How to solve the POR problem in those applications. Is it only possible in hardware?

RE: nRF52832 battery powered rise time issue

Turbo J — Tue, 15 Sep 2020 09:56:27 GMT

[quote userid="93485" url="~/f/nordic-q-a/65938/nrf52832-battery-powered-rise-time-issue"]one lithium cell. When the battery is very deeply discharged (e.g 1.0V),[/quote]

... the cell is dead and could possibly set itself on fire.

Li-Ion cells absolutely require a deep discharge protection circuit, which would also somewhat solve the POR problem.