Implementation of an Isolated I2C Interface Device Based on OOK Codec

As a wide used protocol in industry, BMS and T&D system, I2C bus with isolation features stands out to provide additional safety protection and noise immunity. This paper introduces an implementation method of the isolated I2C interface device with high reliability and low delay. This device can meet the I2C ultra-high speed working mode with communication frequency of 1.7MHz as well as prevent the occurrence of interlock in bi-directional communication. The device is fabricated in 0.18um CMOS process.