LM 335 Temperature Sensor Circuit

Temperature Control Circuit :

Image Courtesy Texas Instrument

The temperature controller circuit using +5 V voltage source from I/O slot at IBM PC/XT/AT.

IC LM 335 from Texas Instrument have the ability to detect temperature from ranging -40 celcius degree until 100 celcius degree.

This LM 335 from Texas Instrument , is zener diode which have the linear coefficient voltage increment related with increment of temperature with formula :

Vz = + 10 mV/ C (celcius degree) , with current opeartion between 400 uA until 5 mA.

On the circuit Resistor 2.2 K use for limit the current flow to cathode pin from LM 335 which is output of LM 335 sensor temperature.

On circuit Resistance of R is 2.2 K , and at 25 Celcius degree from data sheet of LM 335 , voltage at LM 335 will be 2.982 Volt , so current flow can be calculate :

Vcc = + 5 V

Voltage at 25 Celcius on LM 335 = 2.982 V

Voltage at Resistor R 2.2K is = 2.018 V

Current flow through LM 335 and R will be = 2.018 V / 2.2 K = 0.9 mA

This 0.9 mA current at LM 335 still on at range of sensor LM 335, and then the output cathode pin of LM 335 sensor from Texas Instrument connect to input 0 of ADC0809 Analog and Digital convertion data from Texas Instrument at pin 26.