System and method for programmable brown-out detection and differentiation
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United States of America Patent
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Aug 24, 1999
Grant Date -
N/A
app pub date -
Dec 12, 1997
filing date -
Dec 12, 1997
priority date (Note) -
Expired
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Abstract
A system and method for detecting brown-out conditions in a microcontroller, enabling a user to program the brown out detection system, and distinguishing between real brown-out events and transitory voltage swings without requiring expensive and time consuming logic. The invention compares a sense voltage to a reference voltage and filters the resulting signal to distinguish between a true-brown out signal and transitory voltage swings. The invention uses one or more program bits that vary the ratio of the supply voltage and the sense voltage. That is, the sense voltage is programmable and is dependent upon the value of the supply voltage and the value of the program bits. The present invention generates a comparison output signal based upon the comparison of the supply voltage and the sense voltage. The comparison output signal is filtered to distinguish between a real brown-out event and transitory voltage swings.
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