The HART protocol is coming to another popular interface that is used today in industrial communications. The HART communications protocol is a digital industrial automation protocol. Its most notable advantage is that it can communicate over legacy 4-20 mA analog instrumentation wiring. It is one of the most popular industrial protocols today since it is a good transition protocol for users who were comfortable using the legacy 4-20 mA signals, but wanted to implement a “smart” protocol. HART uses low frequencies (1200 Hz and 2200 Hz representing 1 and 0). The single-chip implementation integrates handling of the protocol and providing PHY layer support.