https://devzone.nordicsemi.com/f/nordic-q-a/126379/nrf5340-i2c-frequency-settingHi In nRF5340 datasheet I2C frequency only have 4 selection as below But when ask your AI, he response below Important errata at 400 kHz For all nRF5340 revisions, there is an erratum: at 400 kHz the SCL low period is about 1.25 &#181;s, which isen-USTelligent Community 13Tue, 06 Jan 2026 10:50:50 GMThttps://devzone.nordicsemi.com/thread/558010?ContentTypeID=1Tue, 06 Jan 2026 10:50:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7bec015c-9593-4498-a508-0af97228e2c5Kenneth<p>Hello,</p> <p>Only the values listed in the datasheet have been qualified and tested, and should be the ones to use.</p> <p>The only exception is if an errata exists that provide specific workarounds, and in this case (depending on which ncs version you are using), the workaround should be implemented in the low level drivers, for instance when you try to use 400kHz it will apply the errata like this in ncs v3.2.0:</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1767696626547v1.png" alt=" " /></p> <p>Kenneth</p><div style="clear:both;"></div>