https://devzone.nordicsemi.com/f/nordic-q-a/117017/nrf5340-dk-usb-external-powerHello. I am using the nRF5340 DK. According to the circuit diagram, it seems that when I apply power to VBUS_nRF, there should be no power on VDD_nRF of the MCU. (Power only to VBUS_nRF, Switch9 is located on VSRC_NRF) And it looks like theen-USTelligent Community 13Tue, 10 Dec 2024 11:49:35 GMThttps://devzone.nordicsemi.com/thread/514228?ContentTypeID=1Tue, 10 Dec 2024 11:49:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d886d598-ab20-40bd-8fdb-48ed9650593aSigurd<p>Hi!</p> <p>Jonathan is out of office today, so I&#39;m answering instead.</p> <p>When the nRF5340 is in High voltage mode,&nbsp;<span>The VREGH regulator supplies the VDD pin.</span></p> <p><a href="https://docs.nordicsemi.com/bundle/ps_nrf5340/page/chapters/supply/doc/power_supply.html#ariaid-title3">https://docs.nordicsemi.com/bundle/ps_nrf5340/page/chapters/supply/doc/power_supply.html#ariaid-title3</a></p> <p><span>&nbsp;In high voltage mode, VDD voltage equals the level specified in the&nbsp;</span><a href="https://docs.nordicsemi.com/bundle/ps_nrf5340/page/chapters/uicr/doc/uicr.html#register.VREGHVOUT">VREGHVOUT</a><span>&nbsp;register.</span></p> <p><span><a href="https://docs.nordicsemi.com/bundle/ps_nrf5340/page/regulators.html#ariaid-title5">https://docs.nordicsemi.com/bundle/ps_nrf5340/page/regulators.html#ariaid-title5</a></span></p> <p><span></span></p> <p><span></span></p> <p><span></span></p> <p><span></span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/513639?ContentTypeID=1Thu, 05 Dec 2024 13:39:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f166d335-4139-4e80-947f-bf3de8fdc875k1minseok<p>Hello&nbsp;<span>Jonathan</span></p> <p>My DK version is 2.0.</p> <p>The versions of DK and schematic match.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/513635?ContentTypeID=1Thu, 05 Dec 2024 13:33:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b62c353d-5720-4bdd-a2fa-d827a0344d97JONATHAN LL<p>What version of the DK do you have? what does it say on the sticker?<br /><br />Regards,<br />Jonathan</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/513525?ContentTypeID=1Wed, 04 Dec 2024 23:27:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f616100a-4d8d-4dbb-a5f5-8f8f01388831k1minseok<p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1733365514463v1.png" alt=" " /></p> <p>In the circuit above, we see that the VDD pin(pin number 1 of P1) of the DK board is connected to VIO.</p> <p></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/pastedimage1733365709906v2.png" alt=" " /><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1733365721290v3.png" alt=" " /></p> <p>However, as shown in the circuit above, VIO is fed through VDD and VDD is fed through VSRC_NRF only when SW10 is turned ON.</p> <p></p> <p>When power is applied to VBUS_nRF only,<br />@ SW10 == OFF) VDD pin = 3V<br />@ SW10 == ON) VDD pin = 2V<br />is measured.</p> <p>When SW10 == OFF, shouldn&#39;t 0V be measured on VDD pin?</p> <p></p> <div id="gtx-trans" style="left:-11px;position:absolute;top:392.425px;"> <div class="gtx-trans-icon"></div> </div><div style="clear:both;"></div>