Temperature tamper detection circuit and method

Details Temperature tamper detection circuit and method Temperature tamper detection circuit and method

2008-04-22

2008-04-22

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Bipolar

C341S141000

Reexamination Certificate

active

07362248

ABSTRACT:
A sensing circuit determines whether an integrated circuit is currently exposed to one of a relatively low or a relatively high temperature. A selection circuit selects a measured voltage across the base-emitter of a bipolar transistor if the sensing circuit indicates that the circuit is exposed to the relatively low temperature or, alternatively, selects a measured delta voltage across the base-emitter of the bipolar transistor if the sensing circuit indicates that the circuit is exposed to the relatively high temperature. A comparator compares the selected measured voltage against a first reference voltage indicative of a too cold temperature condition or compares the selected measured delta voltage against a second reference voltage indicative of a too hot temperature condition. As a result of the comparison, detection may be made as to whether the integrated circuit is currently exposed to a too cold or too hot temperature.

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Partial European Search Report for EP 06255947.1-1236 dated Mar. 13, 2007.

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