https://devzone.nordicsemi.com/f/nordic-q-a/52796/vbus-on-nrf52840Hello, My system is going to run off a Lithium Ion battery. I don&#39;t need to use the USB Interface on nRF52840. Is it okay for me to leave VBUS, D+, D- floating? And connect 4.2V Li+ Battery to VDDH? Thanks, Hani Abidien-USTelligent Community 13Wed, 02 Oct 2019 08:16:55 GMThttps://devzone.nordicsemi.com/thread/212932?ContentTypeID=1Wed, 02 Oct 2019 08:16:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8c9ea9b6-5a8e-4a60-84b0-f28c71c5f421Simonr<p>Hi Hani</p> <p>It&#39;s recommended to ground VBUS, as this activates an on-chip pull-down on DECUSB, which means you don&#39;t need to use the capacitor in the ref. design, which &quot;saves&quot; you a component. D+ and D- is fine to leave floating.</p> <p><a href="https://devzone.nordicsemi.com/members/sashi">Sashi</a> is absolutely correct in regards to the li-ion battery.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/212894?ContentTypeID=1Wed, 02 Oct 2019 00:14:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4c12f6c9-1f73-4065-b2a7-8b7bac11ff13Sashi<p>As far and I know, there is no requirement to connect&nbsp;<span>VBUS, D+, D-.&nbsp;</span></p> <p><span>VDDH can accept upto 5.5V, so yes you can run with a li-ion battery with way.</span></p> <p><span></span></p> <p>LDO only:</p> <p><img alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/pastedimage1569975521781v1.png" /></p> <p></p> <p>DCDC:</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/pastedimage1569975667516v1.png" alt=" " /></p><div style="clear:both;"></div>