Overheat-sensing circuit and semiconductor integrated circuit device having the same
First Claim
1. An overheat-sensing circuit having a normal operating voltage range and supplied with a power supply voltage from an external voltage source, the overheat-sensing circuit comprising:
- a temperature-sensing circuit for outputting a temperature-sensing voltage that depends on temperature;
a reference voltage generation circuit for outputting a reference voltage; and
a comparison circuit that compares the temperature-sensing voltage with the reference voltage and outputs an overheat-sensing signal based on a result of the comparison, wherein the reference voltage generation circuit outputs the reference voltage in accordance with the power supply voltage when the power supply voltage is within a predetermined voltage range, and generates a limited voltage based on the power supply voltage and outputs the reference voltage in accordance with the limited voltage when the power supply voltage is outside the predetermined voltage range.
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Accused Products
Abstract
An overheat-sensing circuit includes a temperature-sensing circuit for outputting a temperature-sensing voltage, a reference voltage generation circuit for outputting a reference voltage, and a comparison circuit that compares the temperature-sensing voltage with the reference voltage and outputs an overheat-sensing signal based on a result of the comparison. The reference voltage generation circuit outputs the reference voltage in accordance with a power supply voltage when the power supply voltage is within a predetermined voltage range. In contrast, the reference voltage generation circuit generates a limited voltage based on the power supply voltage and outputs the reference voltage in accordance with the limited voltage when the power supply voltage is outside the predetermined voltage range. This approach reduces a variation in an overheat-sensing temperature at which the comparison circuit outputs the overheat-sensing signal.
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Citations
8 Claims
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1. An overheat-sensing circuit having a normal operating voltage range and supplied with a power supply voltage from an external voltage source, the overheat-sensing circuit comprising:
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a temperature-sensing circuit for outputting a temperature-sensing voltage that depends on temperature;
a reference voltage generation circuit for outputting a reference voltage; and
a comparison circuit that compares the temperature-sensing voltage with the reference voltage and outputs an overheat-sensing signal based on a result of the comparison, wherein the reference voltage generation circuit outputs the reference voltage in accordance with the power supply voltage when the power supply voltage is within a predetermined voltage range, and generates a limited voltage based on the power supply voltage and outputs the reference voltage in accordance with the limited voltage when the power supply voltage is outside the predetermined voltage range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification