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Wake-up controller and a method therefor for power control over peripheral circuitry based upon slots of a data field

  • US 7,876,207 B2
  • Filed: 08/28/2007
  • Issued: 01/25/2011
  • Est. Priority Date: 08/31/2006
  • Status: Expired due to Fees
First Claim
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1. A wake-up control device comprising:

  • a detector for receiving a predetermined frequency signal to produce a detection signal;

    a controller operative in response to the detection signal for producing a control signal performing a wake-up control;

    a switch circuit operative in response to said controller for using at least the predetermined frequency signal to power on or off a transmitter/receiver transmitting or receiving information;

    said controller sampling the detection signal to turn on or off said switch circuit based on a number of slots in a header field and a data field forming a frame of the predetermined frequency signal;

    a sampling circuit operative in response to the header field detected for producing a first count-up signal, and operative in response to a field detected other than the header field for producing a second count-up signal;

    a first detection counter for counting the first count-up signal;

    a second detection counter for counting the second count-up signal; and

    a decision circuit operative in response to a count in said first and second detection counters for determining whether said switch circuit is to be turned on or off;

    wherein said controller comprises a shift register for shifting the detection signal by one stage and two stages to produce a first and a second detection signal, and for producing a logical AND of the first and second detection signals,said sampling circuit using the logical AND to produce the first and second count-up signals.

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