reduce Battery power consumptions

RE: reduce Battery power consumptions

Stian Røed Hafskjold — Thu, 04 Jan 2018 07:34:18 GMT

3µA sounds reasonable. The power profiler kit is not professional lab equipment, so then the accuracy will not be as good.

RE: reduce Battery power consumptions

Dhaval Dalvadi — Thu, 04 Jan 2018 05:53:12 GMT

what is difference if I will use power profiler kit instead of power analyzer?

RE: reduce Battery power consumptions

Dhaval Dalvadi — Thu, 04 Jan 2018 05:51:24 GMT

If i will remove gpio in event handler then it reduce to 3ua when not broadcasting (instead of 2ua)

RE: reduce Battery power consumptions

Stian Røed Hafskjold — Wed, 03 Jan 2018 11:41:23 GMT

If you measure with a digital multimeter you will not be able to measure the BLE events, only the idle current in between. So your multimeter should show 2 µA, which is the expected IDLE current. If it shows 26µA I'm pretty sure it is because of the GPIOTE IN event and this errata: infocenter.nordicsemi.com/.../anomaly_832_97.html. The workaround is to use PORT event on the GPIO instead.

With power analyzer I'm talking about something like this: www.keysight.com/.../dc-power-analyzer-modular-600-w-4-slots

A low cost option would be the power profiler kit in your link above.

RE: reduce Battery power consumptions

Dhaval Dalvadi — Wed, 03 Jan 2018 11:26:08 GMT

what is power analyzer? i found power profiler kit it make accurate power consumption reading or need to use other equipment? power profiler kit link is below www.nordicsemi.com/.../Power-Profiler-Kit

RE: reduce Battery power consumptions

Dhaval Dalvadi — Wed, 03 Jan 2018 11:20:28 GMT

I am using digital multimeter sleep mode means just stopping advertising periodically with app_timer and it take 383ua i am measuring on nrf52 i have configured one gpio pin to trigger on an input event

RE: reduce Battery power consumptions

Stian Røed Hafskjold — Wed, 03 Jan 2018 11:13:16 GMT

What type of equipment are you using to measure current? Are you using a power analyzer so you can measure the sleep current between the advertising intervals? You say that "sleep mode" consumes more current than broadcasting, what do you mean by sleep mode, are you putting the chip to system OFF mode, or are you just stopping advertising periodically with app_timer?

Is this a custom board? Do you have any schematics?

And, just a wild guess, 26 µA sounds like you are using the IN event in the GPIOTE peripheral. Have you configured one of the GPIOs to trigger on an input event?

RE: reduce Battery power consumptions

endnode — Tue, 02 Jan 2018 06:14:14 GMT

I would say welcome to the real world. The computation done in power profiler or any similar "back of envelope" spreadsheet is based on "ideal" numbers from specifications. However electrons in real world are traveling through real PCB and components, the FW and BLE stack operates in certain way and all together makes the real consumption. That's why these theoretical computations are really just to get order of magnitude ("will it work at all" type of answers) while all the rest must be measured on real world prototypes.

To answer your question: this is the ultimate guide how to lower power consumption of nRF5x based device. You will hardly get something better or more comprehensive.