发明授权
EP1636549B1 METHOD AND APPARATUS FOR REAL TIME CLOCK (RTC) BROWNOUT DETECTION
有权
方法和设备的欠压检测实时时钟（RTC）
- 专利标题： METHOD AND APPARATUS FOR REAL TIME CLOCK (RTC) BROWNOUT DETECTION
- 专利标题（中）： 方法和设备的欠压检测实时时钟（RTC）
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申请号： EP04776464.2申请日： 2004-06-10
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公开(公告)号： EP1636549B1公开(公告)日： 2009-12-02
- 发明人: GRONEMEYER, Steven, A.
- 申请人： SiRF Technology, Inc.
- 申请人地址： 217 Devcon Drive San Jose, CA 95112 US
- 专利权人： SiRF Technology, Inc.
- 当前专利权人： SiRF Technology, Inc.
- 当前专利权人地址： 217 Devcon Drive San Jose, CA 95112 US
- 代理机构： Kramer - Barske - Schmidtchen
- 优先权： US600174 20030620
- 国际公布： WO2005001388 20050106
- 主分类号： G01S1/00
- IPC分类号： G01S1/00 ; G04C10/04 ; G01R19/165 ; G06F1/28
摘要：
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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