Automotive, 2-bit, bidirectional 80V ground level translator for I2C signals

The TXG8122-Q1 device is a dual bidirectional, non-galvanic based voltage and ground-level translator for I2C. This device supports two separate configurable power-supply rails. Side 1 is designed to track VCC1 which accepts any supply voltage from 3V to 5.5V. Side 2 is designed to track VCC2 which accepts any supply voltage from 2.25V to 5.5V. Compared to traditional level shifters, the TXG8122-Q1 can solve the challenges of voltage translation across different ground levels up to ±80V. Both GNDA or GNDB can have an offset ground as long as the difference between GNDA and GNDB remains -80V to +80V.

The Simplified Block Diagram shows a common use case where DC shift occurs between GNDA to GNDB due to parasitic resistance or capacitance. The TXG8122-Q1 is able to support I2C-based communication between systems that have different supply voltages and different ground references. The leakage between GNDA and GNDB is typically 50nA when VCC to GND is shorted.