Fully isolated board, CC1 and CC2 not accessiblehttps://devzone.nordicsemi.com/f/nordic-q-a/124550/fully-isolated-board-cc1-and-cc2-not-accessibleThe nPM1304 requires the CC1 and CC2 pins to be connected to the USBC port. Can they be left open/grounded on the IC side? The problem which arose is that CC1 and CC2 are connected in our design to 5.1k resistors on the external part of the PCB(fullyen-USTelligent Community 13Wed, 24 Sep 2025 10:38:44 GMTRE: Fully isolated board, CC1 and CC2 not accessiblehttps://devzone.nordicsemi.com/thread/549657?ContentTypeID=1Wed, 24 Sep 2025 10:38:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2fa61e50-0f4e-42e0-99fc-a00866886885Simonr<p>Hi</p> <p>As per the <a href="https://docs.nordicsemi.com/bundle/ps_npm1304/page/vbusin.html#ariaid-title4">system regulator section</a> of the nPM1304&nbsp;it is stated that: &quot;<em>If USB Type-C configuration is not used,&nbsp;<span>CC1</span>&nbsp;and&nbsp;<span>CC2</span></em><span><em>&nbsp;can be left floating or connected to ground. The default VBUS current limit will remain at 100 mA until the host negotiates and configures a higher current.</em>&quot;</span></p> <p><span>So for your board, this seems perfectly fine.</span></p> <p><span>Best regards,</span></p> <p><span>Simon</span></p><div style="clear:both;"></div>