Compact programmable temperature detector apparatus
First Claim
1. A programmable temperature detector for generating a signal specifying the relationship of a measured temperature to a selected temperature transition point, said detector comprising:
- a first terminal and a second terminal, said programmable temperature detector being powdered by the potential difference between said first and second terminals;
signal means for generating a plurality of signal pairs, each said signal pair comprising a first signal related to said measured temperature and a second signal specifying a selectable transition reference, each said signal pair associated with a temperature transition point; and
reference comparison means for sensing a program signal on said first terminal, for selecting one of said signal pairs in response to said sensed program signal, and for generating a comparison signal related to the difference of said first and second signals of said selected signal pair.
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Abstract
A programmable temperature detector for simple detection applications is described. The programmable temperature detector has three terminals and a plurality of temperature-transitions points from which to choose. A first terminal receives power from a supply, a second terminal receives a ground reference, and a third terminal provides an indication of an object'"'"'s temperature crossing a selected temperature-transition point. The desired temperature transition point is specified by a single non-precision resistor coupled in series with the power terminal of the detector. The non-precision resistor and a power supply set a program signal, in the form of a current, into the power terminal of the detector. The programmable temperature detector comprises circuitry for quantizing the program signal into a discrete signal level and for selecting a temperature transition point in response.
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Citations
25 Claims
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1. A programmable temperature detector for generating a signal specifying the relationship of a measured temperature to a selected temperature transition point, said detector comprising:
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a first terminal and a second terminal, said programmable temperature detector being powdered by the potential difference between said first and second terminals; signal means for generating a plurality of signal pairs, each said signal pair comprising a first signal related to said measured temperature and a second signal specifying a selectable transition reference, each said signal pair associated with a temperature transition point; and reference comparison means for sensing a program signal on said first terminal, for selecting one of said signal pairs in response to said sensed program signal, and for generating a comparison signal related to the difference of said first and second signals of said selected signal pair. - 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, 24, 25)
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Specification