https://devzone.nordicsemi.com/f/nordic-q-a/66459/external-pull-ups-i2cHello, I&#39;m using nrf52840 and i would like to ask if it possible to use the I2C bus without external pullups. I mean, i would like to avoid using external pullups is there any configuration of the I2C bus in which the external pullpus can be avoideden-USTelligent Community 13Tue, 29 Sep 2020 11:15:03 GMThttps://devzone.nordicsemi.com/thread/272029?ContentTypeID=1Tue, 29 Sep 2020 11:15:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f42b421e-9243-406a-8980-32daca5e8831Edward_Atam<p>Thank you very much!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/271967?ContentTypeID=1Tue, 29 Sep 2020 08:07:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1ce800de-37d2-468a-bfd0-3d3924a97286Dmitry<p>If you&#39;re using TWI driver from SDK, it configures internal pull-ups by default. To configure manually, add these lines:</p> <p><pre class="ui-code" data-mode="c_cpp">nrf_gpio_cfg(scl_pin, NRF_GPIO_PIN_DIR_INPUT, NRF_GPIO_PIN_INPUT_CONNECT, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_S0D1, NRF_GPIO_PIN_NOSENSE); nrf_gpio_cfg(sda_pin, NRF_GPIO_PIN_DIR_INPUT, NRF_GPIO_PIN_INPUT_CONNECT, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_S0D1, NRF_GPIO_PIN_NOSENSE); </pre></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/271955?ContentTypeID=1Tue, 29 Sep 2020 07:51:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:77b31e61-429d-4ebe-af44-e6929b7f8449Edward_Atam<p>Thanks,</p> <p></p> <p>How can I confgure the internal pull-ups?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/271858?ContentTypeID=1Mon, 28 Sep 2020 15:59:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:26d16edb-62f6-485f-82fb-3c6ca4dca222Dmitry<p>Hi,</p> <p>I2C will not work without pull-ups, as it&#39;s open-drain bus. You can configure internal pull-ups on SCL and SDA pins - they have 11-16k resistance according to spec, such configuration will work only in standard (100 kHz) mode and limited by ~75pF load capacitance.</p><div style="clear:both;"></div>