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Digital real time clock monitor for a GNSS receiver and single pin signalling for power-on reset and wake-up interrupt

  • US 9,651,676 B2
  • Filed: 07/10/2014
  • Issued: 05/16/2017
  • Est. Priority Date: 10/09/2013
  • Status: Active Grant
First Claim
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1. A portable electronic device having a Global Navigation Satellite System (GNSS) receiver, comprising:

  • a GNSS oscillator configured to output a GNSS timing signal for the GNSS receiver;

    a Real Time Clock (RTC) oscillator configured to output an RTC timing signal;

    a resistance/capacitance (RC) oscillator configured to output a digital pulse signal; and

    a digital RTC monitor Integrated Circuit (IC) configured to monitor the RTC oscillator timing signal, the digital RTC Monitor IC comprising;

    an RTC input configured to receive the RTC oscillator timing signal;

    an RC input configured to receive the RC oscillator digital pulse signal; and

    an RTC reset output configured to output an RTC reset signal when a comparison of the RTC and RC oscillator inputs show the RTC oscillator has missed one or more clock cycles,wherein the GNSS receiver, when re-starting GNSS operations after the GNSS oscillator has been powered down, does not use the RTC timing signal to re-correlate GNSS operations when the RTC reset signal has been asserted.

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