4 Road Temperature Monitoring Circuit of Thermistance

Published:2011/7/22 21:50:00 Author:Michel | Keyword: Thermistance, 4 Road, Temperature Monitoring | From:SeekIC

The picture 3-12 is 4 roads temperature monitoring circuit compsoed of thermistance etc.This circuit sets the thermistors RPl-RT4 in 4 places (chA, chB, chCand chD)in the test site and monitors the temperature of the 4 places.RP1 and RP2, RP3 and RP4, RP5 and RP6, RP7 and RP8 set the high and low temperature of chA,chB,chC and chD respectively.It uses time-slice method to switch RT1 and RT4 order and the temperature range is set between high and low temperature.It is input to window comparator and is judged and the judgement result is locked and output.NE555 and MC14027 (1), MCl4027(2) decide the switch frequency and the switch frequency is about 1Hz according to the device's parameters.



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