https://devzone.nordicsemi.com/f/nordic-q-a/123787/cc-lines-esd-protectionHello, I&#39;m designing a medical product, aiming at IEC 61000-4-2 level 4 ESD protection, and I have a question on the CC lines. My understanding is that these two lines could be used by my device to identify the power capabilities of the charger, anden-USTelligent Community 13Wed, 20 Aug 2025 08:26:22 GMThttps://devzone.nordicsemi.com/thread/546140?ContentTypeID=1Wed, 20 Aug 2025 08:26:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:81dd2225-9418-4189-bd13-542749255ab2Bendik Heiskel<p>Hi,</p> <p>The CC lines are used for negotiating the maximum VBUS current from the source device.They are not required, and the CC pins on the nPM1300 can be left floating or grounded. If the CC pins aren&#39;t used the default current VBUS current limit is 100mA, this can be changed by the host MCU over the I2C interface by writing to the <a href="https://docs.nordicsemi.com/bundle/ps_npm1300/page/vbusin.html#ariaid-title11">VBUSINLIM0</a> register. By default a USB 2 source device should be able to supply a minimum of 500mA, so you should be safe increasing the VBUS current limit up to 500mA.</p> <p>&nbsp;</p> <p>Best regards,</p> <p>Bendik</p><div style="clear:both;"></div>