Method and apparatus for real time clock (RTC) brownout detection
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United States of America Patent
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Jan 4, 2011
Grant Date -
Dec 31, 2009
app pub date -
Jun 22, 2009
filing date -
Oct 30, 2001
priority date (Note) -
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Abstract
A method and apparatus for real time clock brownout detection. A low power real time clock (RTC) operates continuously to keep time in a global positioning system (GPS) receiver while some receiver components are powered down. In various embodiments, a brownout detector circuit detects a loss of RTC clock cycles. If a loss of RTC clock cycles exceeds a predetermined threshold such that the RTC is not reliable for GPS navigation, an RTC status signal so indicates.
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