NRF52832 current consumption problem

RE: NRF52832 current consumption problem

secondbest — Mon, 30 Oct 2017 06:28:22 GMT

Thanks. I try this suggestion.

RE: NRF52832 current consumption problem

Bjørn Kvaale — Fri, 27 Oct 2017 07:17:25 GMT

@secondbest You could also consider buying the Nordic Power Profiling Kit. That would be a pretty cheap option to get good current measurements. Like AmbystomaLabs says, you have to have a good ammeter to be able to take accurate current measurements.

RE: NRF52832 current consumption problem

AmbystomaLabs — Thu, 26 Oct 2017 14:49:48 GMT

Oh, and it is better to run it on a calibrated lab supply vs. a button cell. Button cells have horrible V/I relationships. Remember that the current goes up on the nRF as the supply voltage goes down due to the buck converter.

RE: NRF52832 current consumption problem

AmbystomaLabs — Thu, 26 Oct 2017 14:43:26 GMT

None of those links mention severing the swd connection. In my experience you have to do that as well. Also, the accuracy of your ammeter is crucial. I have a really expensive desktop multimeter with adjustable sample averaging and a 10mA scale. If you don't have a very good meter than an o-scope will likely give you better results.
Also you will need to find some way to calibrate your shunt resistance and make sure it really is close to your assumptions.

RE: NRF52832 current consumption problem

secondbest — Thu, 26 Oct 2017 14:07:39 GMT

Thanks for your response. I used this link and this to make current measurement. The voltage supply of the nrf52 dk is only cr2032 battery. I cut SB9 and solder SB11 to use only cr2032.

RE: NRF52832 current consumption problem

AmbystomaLabs — Thu, 26 Oct 2017 13:46:04 GMT

Trying to measure current consumption on a DK would be difficult at best. The DK's have a lot of peripheral GPIO and permanently connected SWD to the segger.
You really need to sever all these connections and power the nRF independently. The gpio can allow current to pass into and out of the device. Also you want to make sure you are not trying to power the segger while you measure.