https://devzone.nordicsemi.com/f/nordic-q-a/121846/questions-about-sed-devicesHi,the nodic team I use the system on mode to made the SED device into the low power,I found that in addition to my 5s polling woke up the device, there was another that woke up almost 4s. What is the reason? The following image: By the way, whenen-USTelligent Community 13Wed, 28 May 2025 13:02:09 GMThttps://devzone.nordicsemi.com/thread/537367?ContentTypeID=1Wed, 28 May 2025 13:02:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6130c123-8cdc-43f5-a374-5ba7cab4dd41Emil Lenngren<p>It could be the calibration of HFINT that is scheduled to run every 4th second, which will prevent GRTC&#39;s counter while in active mode from drifting at low temperatures (-13 degrees C or lower when I did some measurements). See&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/116993/nrf54l15-ble-power-consumption-spikes/513625.">devzone.nordicsemi.com/.../513625.</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/537363?ContentTypeID=1Wed, 28 May 2025 12:48:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:99e024ab-e52a-4be1-9622-bc98f7379958Sigurd Hellesvik<p>Hi,</p> [quote user=""]I use the system on mode to made the SED device into the low power,I found that in addition to my 5s polling woke up the device, there was another that woke up almost 4s. What is the reason? The following image:[/quote] <p>Do you got logs from the device?</p> <p>Do you run a sample or custom code?</p> [quote user=""]By the way, when the SED device is in system on mode with low power, will that static variable data be lost? How do you use the flash that doesn&#39;t lose power if you lose it?[/quote] <p>Are you referring to any specific data, such as Thread network information?</p> <p>Regards,<br />Sigurd Hellesvik</p><div style="clear:both;"></div>