https://devzone.nordicsemi.com/f/nordic-q-a/35905/nfc-antenna-matchingHi there, we are currently designing an NFC antenna for our product based on the NRF52840. The integration guide out of the spec is pretty comprehensive (see below)... But I still have a few questions: Can you confirm that Cp1 &amp; Cp2 are parasticsen-USTelligent Community 13Wed, 18 Jul 2018 11:14:24 GMThttps://devzone.nordicsemi.com/thread/140510?ContentTypeID=1Wed, 18 Jul 2018 11:14:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:332c515a-7c0b-4701-add3-01fcdd819d99Mickael<p>Hi Hakon, very clear answer thank you!&nbsp;&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/138907?ContentTypeID=1Wed, 04 Jul 2018 08:55:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:05dcd1ff-be69-4fcf-bed2-04752ace197ahaakonsh<p>Hey Mickael,</p> <p>Sorry for the delayed response.<br /><br />Cp1 and Cp2 is indeed the total parasitic capacitance of the board and antenna. Cint1 and 2 is the pin/pad capacitance (4pF).<br /><br />See GPIO&nbsp;<a title="Electrical specification" href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52840.ps/gpio.html?cp=2_0_0_5_8_2#unique_781289496">Electrical specification</a>&nbsp;Pad capacitance on NFC pads.&nbsp;&nbsp;</p> <p>Cheers,</p> <p>Håkon.</p><div style="clear:both;"></div>