Temperature detection device
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United States of America Patent
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Jan 23, 2018
Issued Date -
N/A
app pub date -
Jun 17, 2014
filing date -
Jul 4, 2013
priority date (Note) -
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Abstract
To provide a high accuracy temperature detection device, a D/A conversion circuit includes a ladder network, constant current circuits and switch circuits. A temperature sensing circuit such as a diode is kept at a threshold temperature of a protecting operation against overheating and the switch circuits are switched according to a predetermined adjustment data value such that a temperature detection voltage is in a prescribed range. Since each of the switch circuits connects between corresponding one of the constant current circuits and a common terminal while disconnecting between the corresponding one of the constant current circuits and corresponding one of current terminals, an electric current flowing to the temperature sensing circuit is constant regardless of the adjustment data value and a correction resolution of the temperature detection voltage is constant.
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