Samsung SR-608EV - Temperature Sensing Circuit

18 Samsung Electronics
8-5. Temp. sensing part
1) Thermistor is used for sensing which has negative resistance coffiecient to the temperature.
2) MICOM input voltage, VF of sensor is ( Vcc: 5V, Rth : Sensor resistance )
3) Refer to conversion table for VF and RTH according to temperature.
RTH
VF= xVcc
RTH + R24
When Sensor is opened
MICOM input “HIGH”
When sensor is cut off
MICOM input “LOW”
(Room Temp Sensor)