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Centigrade thermometre circuit

2014-11-08 13:22  
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Centigrade thermometre circuit
SL134 is three terminal type IC, it is used as temperature sensor. The measuring range is -55~+125℃, its exterior has two kinds: metal package and plastic package. The work voltage range of V+~V- is V±=0.9~30.0V, the current I+=Is+I-, Is=0.01~5.00mA, I+/I-=14~26, the maximum allowable value between R-V is 5V, the maximum allowable power consumption PD=200mW. Under the normal situation, the R-V voltage value temperature factor is about +227μV/K. In this circuit, Ci is used to prevent SL134 self-excited, C2 and C3 are used to 5GOP-07 power supply decoupling, 5G1403 is as the core to form 5GM14433 three and a half digital display voltmeter. To change R3 or R6 then Vx will change in relation to the temperature with the proportion of 10mV/℃, to change Q1 can make Vx=0V when T=0℃.