Temperature/frequency conversion circuit

Published:2011/7/5 20:22:00 Author:Lucas | Keyword: Temperature conversion, frequency conversion | From:SeekIC

In the circuit, the temperature sensor uses thermistor RT, and RT and resistor R2 form the voltage divider circuit to make resistance / temperature characteristic in linear relationship. The voltage Ui is proportional to the temperature, and it is changed into charging current IL for capacitor CT by Al and VT1. A2 could compare the voltage of URl and UCT, when UCT <URl, A2 outputs low level, VT1 is deadline, CT is charged in the current IL; when UCT ≥ UR1, A2 output is high, so that VT2 is saturated conduction, CT is discharged by VT2.



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