TEMPERATURE SENSOR
First Claim
1. A temperature sensor comprising:
- a compare subject voltage output unit for outputting a reference voltage having a constant value irrespective of a change of an external temperature and a third temperature voltage that decreases in response to an increase of an external temperature;
a temperature range decision unit for comparing the reference voltage and the third temperature voltage and outputting an enable signal, wherein the enable signal indicates whether the external temperature is different from normal temperature; and
a temperature signal output unit for outputting, in response to the enable signal, a specific one of a plurality of high temperature signals or a specific one of a plurality of low temperature signals, wherein the output indicates a range of the external temperature.
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Abstract
A temperature sensor includes a compare subject voltage output unit, a temperature range decision unit, and a temperature signal output unit. The compare subject voltage output unit is configured to output a reference voltage having a constant value irrespective of a change of an external temperature and a third temperature voltage that decreases in response to an increase of an external temperature. The temperature range decision unit is configured to compare the reference voltage and the third temperature voltage, and output an enable signal, to indicate whether the external temperature is different from a normal temperature. The temperature signal output unit is configured to output a specific one of a plurality of high temperature signals or a specific one of a plurality of low temperature signals, to indicate a range of the external temperature, in response to the enable signal.
48 Citations
25 Claims
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1. A temperature sensor comprising:
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a compare subject voltage output unit for outputting a reference voltage having a constant value irrespective of a change of an external temperature and a third temperature voltage that decreases in response to an increase of an external temperature; a temperature range decision unit for comparing the reference voltage and the third temperature voltage and outputting an enable signal, wherein the enable signal indicates whether the external temperature is different from normal temperature; and a temperature signal output unit for outputting, in response to the enable signal, a specific one of a plurality of high temperature signals or a specific one of a plurality of low temperature signals, wherein the output indicates a range of the external temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A compare subject voltage output unit, comprising:
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a band gap reference circuit for outputting a constant reference voltage irrespective of a change of an external temperature; a difference voltage generator for generating a difference voltage between a first voltage applied to a base terminal of a BJT transistor included in the band gap reference circuit and a second voltage applied to an emitter terminal of the BJT transistor; and a temperature voltage amplifier for amplifying the difference voltage to a specific level and outputting a third temperature voltage. - View Dependent Claims (25)
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Specification