I2C level shifter

by <a href="http://community.silabs.com/t5/Welcome-and-Announcements/Community-Ranking-System-and-Recognition-Program/m-p/140490#U140490"><font color="#000000"><font size="2">Super Employee</font></font> </a> Daniel_H on ‎06-27-2016 03:35 PM

Question

The MCU master has 1.8V I/Os, will this work with the sensor’s 1.9V~3.6V power supply requirements?

Answer

SCL and SDA require a minimum voltage of 0.7xVDD. The maximum VDD supply allowed for a 1.8V I/O is 2.57V. If this is not achievable, an I2C level shifter is recommended.