Will NRF52840 USB VBUS supply back feedhttps://devzone.nordicsemi.com/f/nordic-q-a/61021/will-nrf52840-usb-vbus-supply-back-feedHi, Could I get clarification on if the USB peripheral is isolated and won&#39;t backfeed? In my product, VDDH &amp; VDD are powered via a DC adapter that can be unplugged while the USB is left connected powering VBUS. DC Adapter -&gt; VDDH / VDD USB Cableen-USTelligent Community 13Mon, 08 Jun 2020 08:05:57 GMTRE: Will NRF52840 USB VBUS supply back feedhttps://devzone.nordicsemi.com/thread/253688?ContentTypeID=1Mon, 08 Jun 2020 08:05:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5e3b9159-9d60-4213-b40a-9d5c7e80007actchong<p>Which circuit configuration are you using ? is it no.5 ? I seem to be experiencing back feed when I have USB supply to VBUS.</p><div style="clear:both;"></div>RE: Will NRF52840 USB VBUS supply back feedhttps://devzone.nordicsemi.com/thread/248209?ContentTypeID=1Tue, 05 May 2020 13:46:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ad4b5bab-bbc3-4c6a-8ef5-2aebe87c18d0Jared<p>Hi,</p> <p>So i&#39;m not sure if you&#39;re asking whether the current will flow in reverse direction from the peripheral or if the VBUS will generate a 5V without being powered. The answer is nevertheless no to both.&nbsp;</p> <p>Let me know if this was not what you were asking about <span class="emoticon" data-url="https://devzone.nordicsemi.com/cfs-file/__key/system/emoji/1f642.svg" title="Slight smile">&#x1f642;</span></p> <p>regards</p> <p>Jared</p><div style="clear:both;"></div>