Determination of environment temp. by comparision of component of pressure


Application Number: 00103093
Application Date: 2000.02.24
Publication Number: 1266181
Publication Date: 2000.09.13
Priority Information: 1999/3/4 JP 057359/1999
International: G01K7/00
Applicant(s) Name: NEC Corp.
Address:
Inventor(s) Name: Chindori Hisanori
Patent Agency Code: 11021
Patent Agent: zhu jingui
Abstract A temperature determining apparatus produces a predetermined reference voltage from an operating voltage supplied thereto from the outside, divides the reference voltage with a pair of resistance values having different temperature-resistance characteristics to produce a first divided voltage and divides the reference voltage with a pair of resistance values having the same temperature-resistance characteristic to produce a second divided voltage, and compares the first and second divided voltages to determine a threshold temperature. Since the reference voltage is constant as long as an ambient temperature is not changed even when the operating voltage is changed, the first and second divided voltages are not changed depending on the operating voltage, thereby allowing the determination of an ambient temperature with favorable accuracy in a wide range of operating voltages.