nrf5340 System_ON low power management?

[kukru]

Board: NRF5340DK
Config Board: nrf5340DK_nrf5340_cpuapp
NCS version: 2.3.0

I'm trying to implement low power management during system_on, what I can do right now is put nrf5340 to system_off and disable UART according to this example 
zephyr/samples/boards/nrf/system_off. I'm focusing on to low power consumption as much as possible during any state in system_on mode,
but it look like this function is only one that work for me. 

" pm_device_action_run(cons, PM_DEVICE_ACTION_SUSPEND); "

 since I can not set it into other PM_STATE, such as 
1. PM_STATE_RUNTIME_IDLE
2. PM_STATE_SUSPEND_TO_IDLE
3. PM_STATE_STANDBY
4. PM_STATE_SUSPEND_TO_RAM
5. PM_STATE_SUSPEND_TO_DISK

So, aside from disable UART, what can I do to achieve proper low power state during system_on,
now, the current consumption is about 5uA (disable UART), I measure current by PPK2, SB40 on DK board was cut, and turn on SW6 to "nrf Only"

[runsiv]

Hi,

Have you read this blogpost  Optimizing Power on nRF5340 SoC Designs ? 

Its a few years old, so some code/api's may have been updated in newer versions of NCS SDK

Regards

Runar 

[kukru]

yes, I'm trying to use other PM_state in the method in section3 (System Power Management), I noticed that even if I applied other pm_state, and no error was shown, no change in power consumption. 

Since I found this post yesterday at khelmutlord's comment (I dont know how to link to the reference comment),
devzone.nordicsemi.com/.../nrf5340-power-management
it look like other pm_state are not supported.