Wake-up controller and a method therefor for power control over peripheral circuitry based upon slots of a data field
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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Abstract
In a wake-up control device for waking up a peripheral circuit such as a transmitter/receiver in a radio communication device, during a standby time in which an RF unit and a processing unit are powered off by a switch, an RF signal is received to produce a detection signal by a detector. The detection signal is transferred to the wake-up controller to be sampled. The header and other fields are detected and counted. A control signal is in turn produced by the respective counts to turn on the switch.
11 Citations
10 Claims
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1. A wake-up control device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for wake-up control comprising the steps of:
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receiving a predetermined frequency signal to produce a detection signal; producing a control signal to perform a wake-up control in response to the detection signal; using at least the predetermined frequency signal in response to the control signal to power on or off a transmitter/receiver transmitting or receiving information; sampling the detection signal to power on or off the transmitter/receiver based on a number of slots of a header field and a data field forming a frame of the predetermined frequency signal; detecting the header field to produce a first count-up signal, and detecting a field other than the header field to produce a second count-up signal; counting the first and second count-up signals; powering on or off the transmitter/receiver based on a count obtained in said step of counting; shifting the detection signal by one stage and two stages to produce a first and a second detection signal; and producing a logical AND of the first and second detection signals; and using the logical AND to produce the first and second count-up signals. - View Dependent Claims (9, 10)
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Specification