![]() This requirement is not compatible with optocouplers, which are unidirectional. ![]() To ensure trouble-free card insertion/removal and robust operation, each interface must be isolated, but isolating I 2C interfaces is complicated because the bus is bidirectional. PC boards used in telecommunications applications often include digitally controlled power converters and circuits that operate at different ground potentials. The PMBus protocol defines an open-standard, digital-power-management protocol that facilitates communication with a power converter or other connected device.įigure 1 shows how an isolation barrier galvanically isolates the I 2C interface from each system connected to it, allowing digital data to travel between two points but preventing the flow of ground current this reduces signal distortion and errors by removing noise that gets coupled onto the communications bus. The power management bus (PMBus), a relatively slow 2-wire communications protocol based on I 2C, is targeted at digital management of power supplies. Developed by Philips in the early 1980s for ICs on a single board, I 2C usage is still increasing. The Inter-Integrated Circuit (I 2C) bus is a 2-wire, bidirectional bus used for low-speed, short-distance communication between integrated circuits. ![]() Maurice O'Brien Download PDF IntroductionĪ key requirement for industrial and instrumentation (I&I), telecommunications, and medical applications is a reliable interface for transmitting data. Designing Robust, Isolated I2C/PMBus Data Interfaces for Industrial, Telecommunications, and Medical Applications
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