Power Management nrf5340

[aarondashine]

Hi,

I am trying to reduce the standby current of my design and have been following the information on the following link:

 Optimizing Power on nRF5340 SoC Designs 

I have found that I cannot add CONFIG_PM=y to my project config as it says it is missing some dependencies. Can you confirm if this is still a valid configuration for the nrf53 range please? Are there any reasons why it would not work on a project?

Thanks

[Vidar Berg]

Hi,

Support for the PM subsystem have been removed for the nRF chips, as it is not needed (https://github.com/nrfconnect/sdk-zephyr/commit/96b38273138f05dd06cf7a58fa361f401e773e5e). However, you can still use CONFIG_PM_DEVICE_RUNTIME setting if you need to suspend peripherals at runtime. 

We will update the blog post to reflect this change.

Best regards,

Vidar

[aarondashine]

Thank you for the quick response and clarifying this for me.

Are the other power options in the blog still valid?

[Vidar Berg]

Section 3, 'System Power Management,' is no longer applicable. Also, there have been some changes to the PM device API, such as the renaming of pm_device_state_set() to pm_device_action_run().

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.5.2/zephyr/releases/release-notes-3.0.html 

I posted a code snippet using the new PM device API here:  RE: How to put the UART to sleep (low power mode)  

What is the idle/floor current you are currently measuring? The floor current can often provide a clue about the problem. In many cases it is sufficient to disable the UARTE (either through the devicetree or by building with CONFIG_SERIAL=n) to get the expected current consumption. You can also use our online power profiler ( opp )  to get an estimate of the expected power usage.

Power optimization of the application is also covered in the SDK documentation: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.5.2/nrf/test_and_optimize/optimizing/power_general.html