Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Reexamination Certificate
2005-04-05
2005-04-05
Gutierrez, Diego (Department: 2859)
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
C374S001000, C377S025000, C331S066000
Reexamination Certificate
active
06874933
ABSTRACT:
A circuit for measuring temperature with all digital components in an integrated circuit. During manufacture, the number of clock period cycles during a known period of time at a predetermined temperature is stored in non-volatile memory. Later, during use of the integrated circuit, a clock circuit is activated and each cycle of its period is counted during a known length of time. Using the previously saved number of clock circuit cycles at a predetermined temperature and a current count of clock cycles for another known length of time, the current period of the clock circuit can be calculated and used to determine the current temperature.
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Branch John W.
Darby & Darby PC
Gutierrez Diego
National Semiconductor Corporation
Pruchnic Jr. Stanley J.
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