https://devzone.nordicsemi.com/f/nordic-q-a/128365/i2c-port-requirements-in-nrf54lm20aI am testing a custom board prototype and having trouble getting I2C to work. During testing, I was able to observe activity on the SDA line, although it consisted of only a single-bit pulse with no address. I also observed a clock signal on SCL whenen-USTelligent Community 13Mon, 08 Jun 2026 15:01:20 GMThttps://devzone.nordicsemi.com/thread/567552?ContentTypeID=1Mon, 08 Jun 2026 15:01:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6e60380b-f5b0-4fab-a62d-bb0df00b686cRodrigo Moraes<p>That is exactly the information I was looking for. Thanks!</p> <p>Regarding the I2C bit-banging, I found this Zephyr driver, which is working for my use case (as far as I have tested):</p> <p><a id="" href="https://docs.zephyrproject.org/latest/build/dts/api/bindings/i2c/gpio-i2c.html">https://docs.zephyrproject.org/latest/build/dts/api/bindings/i2c/gpio-i2c.html</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/567502?ContentTypeID=1Sun, 07 Jun 2026 17:35:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:61aa7367-af91-4498-b68a-1290489833bbKenneth[quote user=""]According to <a href="https://docs.nordicsemi.com/r/bundle/ps_nrf54lm20a/page/overview.html-blockdiagram">the block diagram</a>, GPIO port P2 belongs to the MCU power domain, and I do not see any TWIM peripheral in that domain.[/quote] <p>Correct. For future you may also find this useful:<br /><a href="https://academy.nordicsemi.com/courses/nrf54l-series-express-course/lessons/lesson-2-power-domains-event-system-and-gpio/topic/gpio-ports-and-pin-planning/">https://academy.nordicsemi.com/courses/nrf54l-series-express-course/lessons/lesson-2-power-domains-event-system-and-gpio/topic/gpio-ports-and-pin-planning/</a>&nbsp;</p> <p>Kenneth</p><div style="clear:both;"></div>