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10.2Door trip test circuit
The door switch input circuit is used to detect the refrigerator door open or not the circuit module.
Chip I/O PORT port. by testing the continuous high level + 5V to determine whether the door is
open. And then drive the relevant load
10.3Temperature test circuit
It’s conducted by the sensor, making use of the characteristics that resistance value reduces as the
temperature increases, and the thermistor that has temperature coefficient of resistance in medium
temperature.
The characteristic that resistance value reduces as the temperature increases is deemed to have
negative slope or negative temperature coefficient (NTC), and such thermistor is called as NTC
thermistor. The resistance value changes sensitively with temperature and typically changes 7% ~
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