Using PDM in low power mode to trigger wake from sleephttps://devzone.nordicsemi.com/f/nordic-q-a/80885/using-pdm-in-low-power-mode-to-trigger-wake-from-sleepI am using the Arduino Nano 33 BLE Sense (with nRF52840) which comes with a mounted MEMS PDM microphone ( MP34DT05 ). My project will be battery powered and thus calls for me to put the MCU into low power mode when appropriate. So, what I would like toen-USTelligent Community 13Thu, 21 Oct 2021 18:51:53 GMTRE: Using PDM in low power mode to trigger wake from sleephttps://devzone.nordicsemi.com/thread/335364?ContentTypeID=1Thu, 21 Oct 2021 18:51:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:81533b6d-43bf-4c60-b0cb-f9594c1ea4d8Evan M<p>Ok, I think you are right. I will likely&nbsp;try using an external electret mic and ANADETECT. Thank you for the response!</p> <p>Evan</p> <div id="vidyowebrtcscreenshare_is_installed"></div><div style="clear:both;"></div>RE: Using PDM in low power mode to trigger wake from sleephttps://devzone.nordicsemi.com/thread/335272?ContentTypeID=1Thu, 21 Oct 2021 11:24:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:def47b92-1a56-4fb3-ac64-e1f745d74d4dKenneth<p>My understanding is inline with yours. The mic will continously generate PDM data when there is a CLK signal present, so you can&#39;t really detect the amount of sound level based on an analog &quot;measurement&quot; of this digital signal (e.g. filtering or anadetect). Also, generating the CLK signal will likely be a major contribution to the current consumption here, because while the CLK signal is&nbsp;enabled&nbsp;there are internal regulators and clocks that need to be powered. I can&#39;t really see any easy way forward here, other than duty cycle the mic frequently to try to evaluate the noise in the system based on the digitial samples from the PDM.</p> <p>Kenneth</p><div style="clear:both;"></div>