Electronic – Do I need to pull up the I2C voltage to the VCC of a ADC

adci2c

I am planning to use LTC2451 which is a ADC with I2C interface. The main bus voltage that supplies the LTC2451 & the MCU is 3.7V and the GPIO voltage of the MCU is 1.8V. Is it safe to pull up the SDA & SCL lines of the ADC to 1.8V when the ADC VCC is 3.7V?

Best Answer

Datasheet says you must pull to Vcc. Look at the Vil and Vih.

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