Method and apparatus for real time clock (RTC) brownout...

Details Method and apparatus for real time clock (RTC) brownout... Method and apparatus for real time clock (RTC) brownout...

2011-01-04

2011-01-04

To, Tuan C (Department: 3663)

Data processing: vehicles, navigation, and relative location

Navigation

Employing position determining equipment

C331S066000, C331S167000, C331S176000, C342S357490

Reexamination Certificate

active

07865307

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.

REFERENCES:
patent: 4380745 (1983-04-01), Barlow et al.
patent: 5081431 (1992-01-01), Kubo et al.
patent: 5491486 (1996-02-01), Welles et al.
patent: 5654718 (1997-08-01), Beason et al.
patent: 5771180 (1998-06-01), Culbert
patent: 5848376 (1998-12-01), Steiner et al.
patent: 6374169 (2002-04-01), Demay et al.
patent: 2003/0016169 (2003-01-01), Jandrell
patent: 2003/0016170 (2003-01-01), Jandrell

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