Optocouplers, I~2C bus basics

摘要

The inter-IC bus (I~2C bus), a serial digital signal communication protocol developed by Philips Semiconductors, is being used in an increasing number of applications, including consumer appliances, communications equipment, and industrial equipment. In practically all cases, low voltage optocouplers are used to provide galvanic isolation in the 3.3 V I~2C bus interface. In a minimal configuration, three high-speed optocouplers are used to isolate the CLK, SDA_IN, and SDA_OUT bus signals.