How to achieve low power consumption on custom nRF5340 board.

RE: How to achieve low power consumption on custom nRF5340 board.

Simonr — Mon, 25 Aug 2025 12:31:24 GMT

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Best regards,

Simon

RE: How to achieve low power consumption on custom nRF5340 board.

Michael Crevier — Fri, 22 Aug 2025 03:13:08 GMT

Hi, did you manage to solve that problem? I’m facing a similar situation, and I’ve reached a point where none of my attempts are giving results.

RE: How to achieve low power consumption on custom nRF5340 board.

Simonr — Tue, 11 Jun 2024 11:22:10 GMT

To get lower than 10µA the power management configs shouldn't be necessary, as if no threads are running, the Zephyr RTOS should go to IDLE mode by default, and draw a single digit number of µA. So there must either be something else on your board drawing power or something running. But 2.7mA would mean likely the radio being left running.

Best regards,

Simon

RE: How to achieve low power consumption on custom nRF5340 board.

siva97 — Mon, 10 Jun 2024 11:37:00 GMT

Hi Simon,

From, what I understand so far.

Low power consumption (< 10uA) can be achieved with the following steps,

Enable the Power Management (adding PM configs) on both the application and the child image prj.conf file.
Disable the serial logging on both the application and the child image.
Disable the unused peripherals on both the application and the child image.

Do I get it correctly?

Also, I need some clarity on the following,

Are the steps mentioned above sufficient, or are any additional steps required to achieve low power consumption?
Is calling "pm_state_force" to enter the sleep state, necessary or optional?
Is adding a list of Power States for the CPU in the .dts file, required or not?

[quote userid="75734" url="~/f/nordic-q-a/111717/how-to-achieve-low-power-consumption-on-custom-nrf5340-board/487425"]What sample project is your application based on here exactly? [/quote]

Our application isn't based on any sample project.

RE: How to achieve low power consumption on custom nRF5340 board.

Simonr — Wed, 05 Jun 2024 07:11:00 GMT

Also make sure that logging, etc. is disabled for both the child image and application image in your prj.conf file and that you make sure there aren't any unused peripherals that are enabled in the child image as well as the application core, as this has been an issue in the past. You can use the DeviceTree Visual Editor to get a better look visually at what is enabled and not in your project. What sample project is your application based on here exactly?

Best regards,

Simon

RE: How to achieve low power consumption on custom nRF5340 board.

siva97 — Tue, 04 Jun 2024 02:41:44 GMT

Hi Simonr,

Thanks for your reply.

[quote userid="75734" url="~/f/nordic-q-a/111717/how-to-achieve-low-power-consumption-on-custom-nrf5340-board/487135"]Can you show me how you are putting the device into system off here.[/quote]

We're using "pm_state_force" function call with the SOFT_OFF power state to put the device into system off.

uint8_t id = _current_cpu->id;
bool ret = pm_state_force(id, &(struct pm_state_info) {PM_STATE_SOFT_OFF, 0, 0});

[quote userid="75734" url="~/f/nordic-q-a/111717/how-to-achieve-low-power-consumption-on-custom-nrf5340-board/487135"]must define and enable Power Management in the image and the child image[/quote]

You mean, adding the PM config in the image and child image .conf right?

We have added that, or is there anything else need to be added in the child image .conf file.

RE: How to achieve low power consumption on custom nRF5340 board.

Simonr — Mon, 03 Jun 2024 13:04:04 GMT

Can you show me how you are putting the device into system off here. Also keep in mind that you need to set this for both the NET and APP core, and thus also must define and enable Power Management in the image and the child image.

Best regards,

Simon