https://devzone.nordicsemi.com/f/nordic-q-a/28335/nrf52840-usb-pins-impedanceHow much is the nRF52840 USB DP/DM pins impedance in transmit mode? There is no info in datasheet . On the PDK board there are 39 ohm resistors connected in series with USB signals. Are they intended for impedance matching ? If 39 Ohm is the correcten-USTelligent Community 13Thu, 14 Dec 2017 16:29:08 GMThttps://devzone.nordicsemi.com/thread/111856?ContentTypeID=1Thu, 14 Dec 2017 16:29:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2908dd5e-1d1a-4e54-98f5-2af9db2fccafArtak<p>Thanks for replying :)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/111855?ContentTypeID=1Thu, 14 Dec 2017 15:16:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d4574cb7-663d-4d6e-8203-604302bdd046Sigurd<p>Hi,</p> <p>These external resistors are not needed, and will be removed in the future DKs. Everything needed is integrated in the SoC.</p><div style="clear:both;"></div>