nRF52 idle current in timeslot

[Thiemo van Engelen]

Hi,

I have an application running on a nRF52832, roughly based on the OpenMesh (github.com/.../nRF51-ble-bcast-mesh) code with respect to the timeslot API usage. In one test I disabled the RADIO and HF crystal and looked at the current consumption. The measured (idle) value during the timeslot was 375 uA more than the idle current outside of the timeslot. I expected the idle current in the timeslot to be a bit higher than the idle current outside of the timeslot, because TIMER0 is running, requiring 5 uA and this requires the internal HF clock, requiring 60 uA, but that does not count up to 375 uA. From the current it looks like the softdevice keeps another peripheral running during the timeslot , but I could not figure out which one. Does anybody perhaps have an idea?

Regards,

Thiemo van Engelen

[Thiemo van Engelen]

I found out that I did not have the DC/DC converter enabled. Enabling this reduces the difference to approx 200 uA. This still leaves around 130 uA unaccounted for, which apparently depends on the DC/DC converter regarding its power. Maybe this gives a clue on what it could be.

I did check the MWU when the timeslot enters starts and the REGIONEN register is 0, so no watches are enabled.