Current consumption difference between SDK16 and SDK15.3

RE: Current consumption difference between SDK16 and SDK15.3

Daichi — Thu, 09 Apr 2020 01:05:08 GMT

Please tell me additionally.
Is there a function other than UARTE that consumes current even if there is no activity?

RE: Current consumption difference between SDK16 and SDK15.3

Daichi — Thu, 09 Apr 2020 00:56:27 GMT

Hi, Jørgen!

I set NRF_LOG ENABLED to 0, the result was the same as you.
I can understand.

Thank you for your reply!

RE: Current consumption difference between SDK16 and SDK15.3

Jørgen Holmefjord — Wed, 08 Apr 2020 09:40:03 GMT

Hi,

The current is caused by the NRF_LOG module, which is enable with UART backend. If you set NRF_LOG_ENABLED to 0 in the sdk_config.h file, you should see similar current in both SDK releases (I measure between 4-5 uA).

In nrfx driver library v1.7.0, a change was added to reduce the UARTE current when there is no activity. nRF5 SDK v15.3.0 included nrfx v1.6.2, while nRF5 SDK v16.0.0 includes nrfx v1.8.0, which should explain the difference in current when logging is enabled.

Best regards,
Jørgen