Complete 4 mA to 20 mA Loop Powered Field Instrument with HART Interface based on ADuCM360 MCU

Circuit is a complete smart industrial, loop powered field instrument with 4 mA to 20 mA analog output and a highway addressable remote transducer (HART) interface. HART is a digital 2-way communication in which a 1 mA peak to- peak frequency-shift-keyed (FSK) signal is modulated on top of the standard 4 mA to 20 mA analog current signal. This allows features such as remote calibration, fault interrogation and transmission of process variables, which are necessary in applications such as temperature and pressure control