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US07865307B2 Method and apparatus for real time clock (RTC) brownout detection 有权
用于实时时钟（RTC）掉电检测的方法和装置

  • Patent Title: Method and apparatus for real time clock (RTC) brownout detection
  • Patent Title (中): 用于实时时钟（RTC）掉电检测的方法和装置
  • Application No.: US12489190
    Application Date: 2009-06-22
  • Publication No.: US07865307B2
    Publication Date: 2011-01-04
  • Inventor: Steven A. Gronemeyer
  • Applicant: Steven A. Gronemeyer
  • Agency: Duane Morris LLP
  • Main IPC: G01S1/00
  • IPC: G01S1/00
Method and apparatus for real time clock (RTC) brownout detection
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.
Abstract(Chinese):

一种用于实时时钟欠压检测的方法和装置。 低功耗实时时钟（RTC）连续工作，以在全球定位系统（GPS）接收机中保持时间，而某些接收机组件断电。 在各种实施例中，掉电检测器电路检测RTC时钟周期的损失。 如果RTC时钟周期的损失超过预定阈值，使得RTC对GPS导航不可靠，则RTC状态信号如此指示。

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