NRF52832 Low power scan - using CR2032

RE: NRF52832 Low power scan - using CR2032

Avi — Tue, 07 Apr 2020 11:19:36 GMT

Thank you

RE: NRF52832 Low power scan - using CR2032

Jørgen Holmefjord — Tue, 07 Apr 2020 10:45:08 GMT

Yes, ~14.3 uA average. With ideal battery conditions, the battery could last that long, but it will depend on various conditions.

Also, note that additional processing of data from the scanned beacon/advertising packets in the application will increase the current consumption.

RE: NRF52832 Low power scan - using CR2032

Avi — Tue, 07 Apr 2020 10:02:43 GMT

Thanks. The picture is not clear.

Is it 14uA avarage?

Does it mean that with 220mAH battery, I will get 654 days?

RE: NRF52832 Low power scan - using CR2032

Jørgen Holmefjord — Tue, 07 Apr 2020 08:51:27 GMT

Hi,

You can also save some power by doing passive scanning, compared to active scanning, if the beacons do not use scan response packets to increase the size of the advertised data. Enabling the DCDC regulator will also reduce the current consumption when the RADIO or CPU is active, when running from a 3 V power source. The lower peak current draws will increase the lifetime of the battery.

I created a test program with your specifications and measured its current consumption with our Power Profiler Kit.

This is the average current over 2 minutes:

And this is a zoomed image of the time when the radio is active/scanning:

Attached the project for reference: devzone.nordicsemi.com/.../ble_5F00_app_5F00_beacon_5F00_scanner_5F00_low_5F00_power_5F00_sdk16.zip

These measurements do not include any advertising part, but you can get an idea of the advertising current from the Online Power Profiler.

Best regards,
Jørgen