https://devzone.nordicsemi.com/f/nordic-q-a/113915/nrf5340-i2c-peripheral-power-management-queryHi, I have a question regarding the nRF power management APIs. I&#39;m trying to implement power management in my code, and I found that the pm_device_action_run() API can be used to manage peripheral power consumption by putting the peripheral into a PM_DEVICE_ACTION_SUSPENDen-USTelligent Community 13Wed, 14 Aug 2024 11:55:04 GMThttps://devzone.nordicsemi.com/thread/498264?ContentTypeID=1Wed, 14 Aug 2024 11:55:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2d02ad4b-53fe-46e8-8c62-4d99eb2bd515Susheel Nuguru[quote user=""]Is it necessary to call the <code>pm_device_action_run()</code> API to put the I2C peripheral to sleep, or is the power management of I2C peripherals already handled by the I2C driver provided by Zephyr?[/quote] <p>When you get an error of -120 that the driver is already in that requested state when you run&nbsp;<span>pm_device_action_run, then most likely&nbsp;pm_device_action_run was run before. The&nbsp;zephyr\drivers\i2c\i2c_nrfx_twim.c implements the pm_device plugins, so no, it does not handle the RTOS specific power management by itself.&nbsp;</span></p> <p><span>I would suggest you to put a breakpoint in&nbsp;</span>twim_nrfx_pm_action function and run your application in debugger to see if there has been any other calls to&nbsp;twim_nrfx_pm_action prior to you calling&nbsp;<span>pm_device_action_run&nbsp;. If yes, then check the function call stack to understand the context of when it was called before.</span></p><div style="clear:both;"></div>