https://devzone.nordicsemi.com/f/nordic-q-a/111569/usb-state-questionhi support team, customer asks me about out 840 usb state, if we have usb low power state as below: and below is listed in our spec or i n the USB standard , however There is no direct correlation between the device power states defined inen-USTelligent Community 13Thu, 30 May 2024 06:53:28 GMThttps://devzone.nordicsemi.com/thread/486561?ContentTypeID=1Thu, 30 May 2024 06:53:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d917e310-08c4-4531-9c3b-f50a3e043205William.wei<p>Thanks!</p> <p>Regards,</p> <p>William.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/486245?ContentTypeID=1Tue, 28 May 2024 15:14:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e3128241-2be2-4201-9b1d-e21351c7fd47Sigurd<p>Hi!</p> <p>There is some info in this white paper:&nbsp;<a id="" href="https://www.usb.org/document-library/understanding-wdm-power-management-v11">https://www.usb.org/document-library/understanding-wdm-power-management-v11</a></p> <p><a id="" href="https://www.usb.org/sites/default/files/wdm_pm11.pdf">https://www.usb.org/sites/default/files/wdm_pm11.pdf</a></p> <p>end of page 7:</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1716909164039v1.png" alt=" " /></p> <p>page 8:</p> <p>&quot;For device power states, there is no difference in the status of a device&rsquo;s parent port between the three device sleep states: PowerDeviceD1, PowerDeviceD2, and PowerDeviceD3. Powering down into any of these power states result in the device being suspended. <strong>For USB, there are basically two power categories: fully powered or suspended</strong>.&quot;</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1716909236375v3.png" alt=" " /></p><div style="clear:both;"></div>