https://devzone.nordicsemi.com/f/nordic-q-a/22714/esd-protection-and-programming-on-customized-pcbI am currently designing a customized pcb with the nrf52832 with other two sensors. I have two questions related with the design: I know that the nrf52832 has the HBM ESDprotection, but is this enough when the chip is added to a customized pcben-USTelligent Community 13Mon, 26 Jun 2017 13:18:08 GMThttps://devzone.nordicsemi.com/thread/89303?ContentTypeID=1Mon, 26 Jun 2017 13:18:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:67f926d8-adcb-4129-9362-e79db679cce5FormerMember<p>Yes, it will be the same for the SWD pins!</p> <p>No, it is not necessary with additional pull-up/pull-down resistors on the SWD pins.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/89302?ContentTypeID=1Fri, 16 Jun 2017 18:33:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f42365eb-ce4a-4fdf-b5b3-ddc74b08b039User1321<p>Thank you, I guess this can be also applied to the SWD pins. In relation with the SWD pins, do I need to add a capacitor, pull-up resistor to any of these pins? or is it enough with the ESD protection device?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/89301?ContentTypeID=1Tue, 13 Jun 2017 12:31:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1d920d7d-60e2-41b6-8bed-ad9ef4f8910aFormerMember<p>Normally, external ESD protection diodes are not necessary, and most customers don&#39;t use it.</p> <p>However, the on-chip ESD protection is not sufficient for connecting to outside of a product. If you look to end product ESD testing and real world ESD events, the voltages are higher and resistances lower by magnitude. Input pins can easily be protected by adding external series resistor, whereas output and bidirectional pins like USB normally require an active bipolar protection device. </p><div style="clear:both;"></div>