Reduce power consumption in LC3 driver.

RE: Reduce power consumption in LC3 driver.

Elfving — Thu, 11 Sep 2025 12:59:19 GMT

Or what is the problem here exactly, the power (current) or total energy used? Bit and sample rate being reduced would atleast reduce encoding time ->More CPU idle time -> reduced power consumption. Though this would mainly come from the use of the I2S peripheral, and if you need to use I2S all the time, you may not observe too large overall difference from reducing encoding time.

Regards,

Elfving

RE: Reduce power consumption in LC3 driver.

Elfving — Mon, 08 Sep 2025 12:53:42 GMT

[quote user="ChiragBhavsar"]we just read the microphone data using PDM interface,we did not encode the data using the LC3[/quote]

Ah okay. I also see you've opened a new case here. When it comes to lowering the consumption of the LC3 codec I think using the different bitrates I mentioned earlier is the only go-to strategy.

When it comes to the PDM consumption, could you try the suggestion from my colleague there; trying this on a newer NCS version?

Regards,

Elfving

RE: Reduce power consumption in LC3 driver.

ChiragBhavsar — Thu, 04 Sep 2025 03:58:54 GMT

we just read the microphone data using PDM interface,we did not encode the data using the LC3

RE: Reduce power consumption in LC3 driver.

Elfving — Wed, 03 Sep 2025 13:12:59 GMT

Could you expand a bit more how you are testing this? What are you doing in the scenarios when you are not using the LC3?

Regards,

Elfving

RE: Reduce power consumption in LC3 driver.

ChiragBhavsar — Mon, 01 Sep 2025 06:53:23 GMT

We tested current consumption by enabling and disabling LC3.

Our setup:

Board: nRF5340 DK
SDK: NCS v2.6.2
Microphone: MMICT5837-00-012
Interface: PDM

During mono audio capture over PDM, we observed a current draw of about 1.5 mA.

My questions are:

Is there any way to reduce this current consumption further?
How much current does the PDM peripheral itself typically draw in mono mode on the nRF5340 (excluding microphone current)?

RE: Reduce power consumption in LC3 driver.

Elfving — Fri, 29 Aug 2025 13:53:20 GMT

Hi,

First of all, I feel forced to show for instance this, so that you know that there is a lot one could do in regards to power saving.

I can check if the relevant team has any suggestions, but first: Are you using NCS and SDC? What are you using when not using the LC3? Are you seeing any difference between different bitrates etc?

Regards,

Elfving