https://devzone.nordicsemi.com/f/nordic-q-a/96593/nrf5340-i2c-and-spi-digital-i-o-voltage-thresholdsMy host SoC is the nRF5340. I need to interface with the ICM-20948 either over I2C or SPI (SPI preferably). The ICM-20948 VDDIO range is 1.71V to 1.95V. If the nRF5340&#39;s internal regulators are operating in Normal voltage mode, where the nRF5340&#39;s inputen-USTelligent Community 13Mon, 13 Feb 2023 13:54:23 GMThttps://devzone.nordicsemi.com/thread/409619?ContentTypeID=1Mon, 13 Feb 2023 13:54:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5aace115-3fdb-4387-857f-ca048a04418bhaakonsh<p>From nRF5340&nbsp;<a title="GPIO Electrical Specification" href="https://infocenter.nordicsemi.com/topic/ps_nrf5340/gpio.html?cp=4_0_0_6_12_5_0#unique_1679281215">GPIO Electrical Specification</a>:&nbsp;<br />&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</p> <table border="1" cellpadding="4" cellspacing="0" frame="border" rules="all" summary=""><colgroup span="1"><col span="1"><col span="1"><col span="1"><col span="1"><col span="1"><col span="1"><col span="1"><col span="1"><col span="1"><col span="1"></col></col></col></col></col></col></col></col></col></col></colgroup> <thead> <tr> <th colspan="1" rowspan="1">Symbol</th> <th colspan="1" rowspan="1">Description</th> <th colspan="1" rowspan="1">Min.</th> <th colspan="1" rowspan="1">Max.</th> <th colspan="1" rowspan="1">Units</th> </tr> </thead> <tbody> <tr> <td colspan="1" headers="d61091e8660" rowspan="1">V_IH</td> <td colspan="1" headers="d61091e8663" rowspan="1"> <p>Input high voltage</p> </td> <td colspan="1" headers="d61091e8676" rowspan="1"><span>0.7 x VDD</span></td> <td colspan="1" headers="d61091e8682" rowspan="1"><span>VDD</span></td> <td colspan="1" headers="d61091e8685" rowspan="1">V</td> </tr> <tr> <td colspan="1" headers="d61091e8660" rowspan="1">V_IL</td> <td colspan="1" headers="d61091e8663" rowspan="1"> <p>Input low voltage</p> </td> <td colspan="1" headers="d61091e8676" rowspan="1"><span>VSS</span></td> <td colspan="1" headers="d61091e8682" rowspan="1"><span>0.3 x VDD</span></td> <td colspan="1" headers="d61091e8685" rowspan="1">V</td> </tr> </tbody> </table> <p>You will need to run the nRF53 at 1.8V or use a level shifter. If you use the high voltage regulator you can configure it to output 1.8V on VDD from 3.3V supply (2.5 - 5.5V).&nbsp;</p><div style="clear:both;"></div>