Power consumption - DWM3001C

[Braxatoris]

Hello guys,

Im developing RTLS with DWM3001C and right now Im working on personal tag powered by CR2450. So naturally, power consumption should be as low as possible.

So far I managed it to these levels - idle not moving - around 15-20 uA, after moving tag UWB TX is around 22-30 mA spike, and periodically there are every 100ms spikes of 60 uA +/- from accelerometer sampling.

Over past year, i tried everything possible but this is as low as it gets... from what i read it should be able to go 5 uA +/- ? 

Any help will be appreciated :) 

IDLE consuption 

Pinging

[Simonr]

Hi

Okay, do you have an nRF52 series development kit you can measure current on with this device just to make sure we have the same point of reference? For example the system OFF sample here running on a DK can make sure the measuring device is correct: https://docs.nordicsemi.com/bundle/ncs-latest/page/zephyr/samples/boards/nordic/system_off/README.html#nrf_system_off 

Please upload what current consumption you see and what DK you're testing on. If this is expected/similar to what we see on the PPK we can move on to your board.

Best regards,

Simon

[Braxatoris]

Firstly, my apologies for late replay...

Secondly, I have DK only for DWM30001C, I could test it there but I would need to inlcude drivers for DWM and deepsleep it too... maybe later when I found some time..

But meanwhile... we bought PPK II :) so here are results...

This is when device finishes TX and goes to deep sleep... it stabilizes on 13-18 uA ticking... 

This is deep sleep interval... peaks to 28 uA are IMU (LIS2DH12) readings...

DWM should consume around few nA in this state and only thing which should burn power now is LIS sensor

but it is ODR 10hz and LOW POWER mode... in this mode it should consume on average 3-5 uA ? So it still appears to me that NRF is doing something that is consuming power.. or if average calculation of PPK2 is anything to go by... could this be correct ? 5 +/- uA of nrf sleep + 5+/- uA of LIS2DH12 working could average on 12 uA as in picture...