https://devzone.nordicsemi.com/f/nordic-q-a/127209/nrf54l15-i2c-on-nfc-pins-not-workingHello, I am able to reproduce this issue in a blank project where CONFIG_I2C=y and CONFIG_I2C_SHELL=y (and dependencies) are configured on an nRF54L15. When I use P1.3 and P1.2 for SDA and SCL respectively, there are no signal assertions on theen-USTelligent Community 13Sat, 28 Feb 2026 17:41:30 GMThttps://devzone.nordicsemi.com/thread/562257?ContentTypeID=1Sat, 28 Feb 2026 17:41:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1fe89b51-0def-4566-b44a-0bf8cc19cdcfScott R<p>There seem to be some port limitations, like using I2C20 + UART20 + limitations on what pins are available based on domain.</p> <p>I was specifically not aware that P1 usage for I2C was not possible with I2C30. I moved it to I2C21 (to keep standard USB UART functional) and found the rise times were problematic. I had to also remove R21 and R22 on the devkit, to disconnect the NFC capacitors. They were 300 pF and I2C should be fine up to 400 pF on 100 KHz but it seemed to be problematic for the nRF54L15.</p> <p>Now it&#39;s working fine on P1.2 and P1.3, and detecting other I2C devices on the bus.</p><div style="clear:both;"></div>