https://devzone.nordicsemi.com/f/nordic-q-a/95653/twi-configuration-connectionHello Im using nrf52840 in custom board this is my configation but i saw schematic DK nrf52, and its don&#39;t have some one like this, it&#39;s directly whitout external resistors is that resistors necessary or i can to connected directly whitouten-USTelligent Community 13Fri, 13 Jan 2023 08:57:35 GMThttps://devzone.nordicsemi.com/thread/404739?ContentTypeID=1Fri, 13 Jan 2023 08:57:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4127fabc-20f8-4803-9161-10a9988d2aefKarl Ylvisaker<p>Hello,</p> [quote user=""]is that resistors necessary or i can to connected directly whitout resistors?[/quote] <p>No, you can use <a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/gpio.html#register.PIN_CNF-0-31">the internal pullup resistors</a>&nbsp;instead of external ones. The internal pullup are by default enabled by the TWI drivers.<br /><br />Best regards,<br />Karl</p><div style="clear:both;"></div>