https://devzone.nordicsemi.com/f/nordic-q-a/123230/how-to-ensure-only-uart-peripheral-consumes-power-in-nus-example-on-nrf5340Hi Nordic team, I’m working with the nRF5340 using the Bluetooth: NUS (Nordic UART Service) example from the Zephyr SDK . Since this example primarily uses the UART peripheral , I want to make sure that only UART is active and consuming power , anden-USTelligent Community 13Fri, 25 Jul 2025 10:35:10 GMThttps://devzone.nordicsemi.com/thread/543593?ContentTypeID=1Fri, 25 Jul 2025 10:35:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0ffbdf89-591b-42f0-bd83-10caf49f5275pal_722<p>Hi&nbsp;<a href="https://devzone.nordicsemi.com/members/vibe">Vidar Berg</a>&nbsp;<br /><br />Thank you for the reply. Will look into the solution given.</p> <p><br />So do you also mean to say, the other peripherals need not be exclusively disabled for better power optimization ?<br /><br />Regards,<br />Pallavi</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/543470?ContentTypeID=1Thu, 24 Jul 2025 11:07:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fed02fad-f368-4499-a471-d1f2d8c67b3cVidar Berg<p>Hello,</p> <p>Only the UART needs to be actively disabled in this sample. When UARTE with RX reception is enabled, it forces the HF clock to remain active during sleep. I posted a modified version of this sample that only keeps UART enabled while BLE is connected:&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/112115/suspending-uart-async-using-pm_device-action_suspend-causes-crash/489916">RE: Suspending UART Async using PM_DEVICE ACTION_SUSPEND causes crash.</a>&nbsp;&nbsp;</p> <p>General power optimization recommendations:&nbsp;<a href="https://docs.nordicsemi.com/bundle/ncs-3.1.0-preview3/page/nrf/test_and_optimize/optimizing/power.html">https://docs.nordicsemi.com/bundle/ncs-3.1.0-preview3/page/nrf/test_and_optimize/optimizing/power.html</a>&nbsp;</p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>