nRF5340 I2C and SPI Digital I/O Voltage Thresholds?

[Starbuck]

My 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's internal regulators are operating in Normal voltage mode, where the nRF5340's input voltage is 3.3V, what are the nRF5340's I2C and SPI voltage level thresholds for HIGH and LOW?  I'm looking through the nRF5340's Product Specification, but have yet to find where this is specified.

Thank you for your support!

Starbuck

[haakonsh]

From nRF5340 GPIO Electrical Specification: 
                                   

Symbol	Description	Min.	Max.	Units
VIH	Input high voltage	0.7 x VDD	VDD	V
VIL	Input low voltage	VSS	0.3 x VDD	V

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).