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Microcontroller controls current-loop AFE protection

Posted: 23 May 2011     Print Version  Bookmark and Share

Keywords:analogue front end  current-shunt resistor  microprocessor 

The fragile current-shunt resistor in the analogue front end of an isolated 0–20mA precision current loop can be protected by a fast fuse or an automatic current-limiting switch. The circuit discussed in this document, however, is faster than a fuse, requires no replacement, and (unlike the switch) provides microprocessor control with an option to log the fault events. The circuit includes a comparator (MAX9910), a microprocessor supervisor with watchdog timer (MAX6706), a D-type flip-flop, an NOR gate, an OR gate, and a solidstate


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