| 摘要 |
PURPOSE:To achieve wide-range temperature measurement by varying the resistance values of resistances connected in series to thermistors for temperature detection according to a temperature measurement range. CONSTITUTION:According to a temperature measurement range, a switching signal is applied from an input terminal switching signal line 20 to multiplexers 18a and 18b. The multiplexer 18b selects resistances connected in series to a thermistor 11a, and a temperature detection signal is applied to an A/D converter 9 through the multiplexer 18a. The multiplexer 18a switches input signals and selects temperature detection signals from other thermistors 11b-11d. The thermistors 11a-11d are applied with a reference voltage Vc. |
