Apparatus and method for calibration of a temperature sensor
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United States of America Patent
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Dec 18, 2007
Grant Date -
N/A
app pub date -
Sep 28, 2004
filing date -
Sep 28, 2004
priority date (Note) -
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Abstract
A circuit for temperature sensing provides a bias current to a PN junction, and the PN junction provides a PN junction voltage in response to the bias current. Also, a parasitic resistance may be coupled in series with the PN junction. The circuit for temperature sensing is configured to determine the temperature of the PN junction based on the PN junction voltage. Further, the circuit includes registers which store .eta.trim, which is based on the difference between the non-ideality of the PN junction used from a reference PN junction; .DELTA.I, which is based on the difference between a reference bias current and the bias current for the part; Rtrim, which is based the parasitic resistance; and Ntrim, which includes other offsets. The registers may be set during trimming and/or calibration to provide accurate temperature sensing for the parameters employed.
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