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soft device power comsumption

Hello,

I have been messing around with a PCA10001 Dev board trying to do some power consumption tests (Beacon demo code). When I enable RTC1 only and use __WFE in the main loop I get just under 4 micro amp. As soon as I call:

SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, false);

I see a constant 2 milli amp draw. If I start to advertise every 4 seconds, I can see on my scope that the advertisement time is extremely small as is stated in the documentation. Why is the idle current draw so high? I feel like I am just missing a setting, maybe the HFCLK is not sleeping?

Any help would be greatly appreciated.

  • If anyone else runs into this problem, it appears to be that a micro amp capable meter causes too much power loss through the circuit when trying to initialize the soft device. I guess it threw me because I was able to do everything else on the chip with the meter hooked up. The solution was a low-side shunt, I was able to measure 3 micro amp between advertisements.

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