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Low voltage alerting device in a paging receiver and method therefor

  • US 5,442,345 A
  • Filed: 12/06/1994
  • Issued: 08/15/1995
  • Est. Priority Date: 11/26/1991
  • Status: Expired due to Term
First Claim
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1. A low voltage alerting circuit in a paging receiver for driving vibrating means in response to received self data in a memory mode, said low voltage alerting circuit comprising:

  • power supply means for providing a power supply voltage;

    low voltage detector means connected to controller means, for generating a first low voltage detection signal independently of reception of said self data by said paging receiver whenever said power supply voltage is less than a first reference voltage, and a second low voltage detection signal independently of reception of said self data by said paging receiver whenever said power supply voltage is less than a second reference voltage lower than said first reference voltage;

    alerting driver means interposed between said power supply means and said low voltage detector means, for sequentially disconnecting electrical conduction between said power supply means and said vibrating means, and between said power supply means and buzzer means in dependence upon said first and second low voltage detection signals, respectively; and

    said controller means for enabling a visual display of low voltage status of said power supply means in dependence upon said first and second low voltage detection signals, and said buzzer means for producing a first audible tone scheme comprised of audible tones each having a first time duration to alert a user of the low voltage status of said power supply means in response to said first low voltage detection signal and for producing a second audible tone scheme comprised of audible tones each having a second time duration to alert the user of the reception of said self data, said first time duration being different than said second time duration.

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