nrf52840 timer current

RE: nrf52840 timer current

Stian Røed Hafskjold — Wed, 11 Oct 2017 12:49:33 GMT

Yes, I agree. The datasheet only looks at the current consumption of the peripheral itself. When the 16MHz clock is enabled, there are other parts of the digital domain that also consume more power. This is unfortunately not documented that well.

RE: nrf52840 timer current

Nicolas Brunner — Wed, 11 Oct 2017 12:43:59 GMT

I have made the measure again following the guide with a 3V external supply:

1MHz: 423 uA
16MHz: 568 uA

with HFXO:

1MHz: 630 uA
16MHz: 776 uA

I also have a ~145 uA difference. It would be great to have correct value in the datasheet.

RE: nrf52840 timer current

Stian Røed Hafskjold — Tue, 10 Oct 2017 12:07:04 GMT

I did measurements with the timer example in SDK 13.0.0 on the PCA10056, out of the box, not changing anything. These are the results:

Frequency set to 16MHz: 543 µA
Frequency set to 1MHz: 398 µA

So the difference should be about 145 µA. I'm not sure why you get 1.28mA in total for just the timer example, but this is too high. Please see the PCA10056 user guide on how to measure current on the DK.