Quasi-passive wakeup function to reduce power consumption of electronic devices
First Claim
1. A method of conserving power in an electronic device, comprising the steps of:
- maintaining the electronic device in a continuous low power shutdown mode until a unique stimulus signal is detected; and
waking up the device from the continuous low power shutdown mode only when the unique stimulus signal is received.
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Accused Products
Abstract
A quasi-passive wake-up function for an electronic device that employs a continuous low power standby mode compares a received signal to a predetermined signal and wakes up the device when the received signal is the same as the predetermined signal. An electronic device having a quasi-passive wakeup function includes a receiver for receiving at least one stimulus signal, a comparator for comparing the received signal to a predetermined signal, and at least one logic gate for waking up the electronic device when the received stimulus signal is the predetermined signal. In one application, identification tags are used to distinguish a unique tagged item from among a plurality of items with a similar appearance. When an interrogation signal is not present, the tags sleep at a very low power level.
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Citations
18 Claims
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1. A method of conserving power in an electronic device, comprising the steps of:
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maintaining the electronic device in a continuous low power shutdown mode until a unique stimulus signal is detected; and waking up the device from the continuous low power shutdown mode only when the unique stimulus signal is received. - View Dependent Claims (2, 3, 4)
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5. A method for waking up an electronic device being maintained in a continuous low power shutdown mode, comprising the steps of:
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receiving a signal at the electronic device; comparing the received signal to a predetermined unique stimulus signal; and waking up the device from the continuous low power shutdown mode only when the received signal is the same as the predetermined unique stimulus signal. - View Dependent Claims (6, 7, 8)
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9. A quasi-passive wakeup device for waking up an electronic device being maintained in a continuous low power sleep mode, comprising:
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a receiver for receiving a stimulus signal; and a comparator for comparing a received signal to a predetermined unique stimulus signal and waking up the electronic device from the continuous low power sleep mode only when the received signal is the predetermined unique stimulus signal. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An electronic device having a quasi-passive wakeup function, comprising:
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a receiver for receiving at least one stimulus signal; a comparator for comparing the received stimulus signal to a predetermined unique stimulus signal and for waking up the electronic device from continuous low power sleep mode only when the received stimulus signal is the predetermined unique stimulus signal; and electronic circuitry, responsive to the operation of the logic gate, for further operation of the electronic device. - View Dependent Claims (16, 17, 18)
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Specification