Title:
リアル・タイム・クロック(RTC)のブラウンアウト検知の方法および装置
Document Type and Number:
Japanese Patent JP2007521483
Kind Code:
A
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.
Inventors:
Stephen A. Grommayer
Application Number:
JP2006517223A
Publication Date:
August 02, 2007
Filing Date:
June 10, 2004
Export Citation:
Assignee:
Surf Technology Incorporated
International Classes:
G01C21/26; G01R19/165; G01S1/00; G01S19/23; G01S19/34; G04C10/04; G04F5/00; G04G19/12; G06F1/14; G06F1/30; G06F1/32
Attorney, Agent or Firm:
Kaiyu International Patent Office