Low power addressable data communication device and method
First Claim
1. A low power, addressable data communication device comprising:
- means for obtaining a data message having a wake-up section and a session section, said obtaining means including a receiver for continuously monitoring for said data message;
a power manager having an input coupled to said obtaining means and having an output, said power manager for detecting a predetermined identification code from said wake-up section of said data message by continuously monitoring for said identification code and coupling said output to a battery when said predetermined identification code is detected; and
a controller having a power input coupled to said power manager output and having a data input coupled to said obtaining means, said controller being configured to process said session section of said data message after said power manager detects said predetermined identification code, wherein said wake-up section of said data message combines wake-up data with a clock signal, and said power manager comprises;
a decoder for separating said clock signal from said wake-up data;
a synchronization circuit coupled to said decoder, said synchronization circuit being configured to detect a predetermined preamble code in said wake-up data; and
an ID detection circuit coupled to said synchronization circuit, said ID detection circuit being configured to determine when a predetermined identification code follows said predetermined preamble code in said wake-up data.
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Accused Products
Abstract
An electronic tag (10) receives a data message (18) that has a wake-up section (20) followed by a session section (22). The interrogation signal which carries the data message encodes the wake-up section (20) differently from the session section (22). A power manager (28) decodes the wake-up section (20) using a very low power decoder (34) that remains energized during a standby state. When the power manager (28) detects a predetermined identification code (26), it controls a switching circuit (32) to energize a controller (30). The controller (30) may then decode, process, and respond to information conveyed during the session section (22). If the power manager (28) does not detect the identification code (26), the controller (30) remains de-energized. The power manager (28) also includes a synchronizer (38) which determines when a preamble (24) is detected, and an ID decoder (40) that determines when the wake-up section (20) conveys the predetermined identification code (26).
399 Citations
19 Claims
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1. A low power, addressable data communication device comprising:
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means for obtaining a data message having a wake-up section and a session section, said obtaining means including a receiver for continuously monitoring for said data message; a power manager having an input coupled to said obtaining means and having an output, said power manager for detecting a predetermined identification code from said wake-up section of said data message by continuously monitoring for said identification code and coupling said output to a battery when said predetermined identification code is detected; and a controller having a power input coupled to said power manager output and having a data input coupled to said obtaining means, said controller being configured to process said session section of said data message after said power manager detects said predetermined identification code, wherein said wake-up section of said data message combines wake-up data with a clock signal, and said power manager comprises; a decoder for separating said clock signal from said wake-up data; a synchronization circuit coupled to said decoder, said synchronization circuit being configured to detect a predetermined preamble code in said wake-up data; and an ID detection circuit coupled to said synchronization circuit, said ID detection circuit being configured to determine when a predetermined identification code follows said predetermined preamble code in said wake-up data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating an addressable data communication device, said method comprising steps of:
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energizing a receiver and a decoder continuously from an internal power source; receiving a data message having a wake-up section which conveys data at a first rate followed by a session section which conveys data at a second rate, said second rate being greater than said first rate; decoding said wake-up section of said data message by said decoder to detect a predetermined identification code; and energizing from an internal power source, when said decoding step detects said predetermined identification code, a controller configured to detect and process data conveyed during said session section, wherein; said wake-up section of said data message combines a data signal and a clock signal; and said decoding step comprises a step of separating said clock signal from said data signal. - View Dependent Claims (12, 13, 14, 15)
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16. A low power, addressable, electronic tag which selectively responds to a radio frequency interrogation signal comprising:
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means, adapted to receive said interrogation signal, for stripping a carrier from a data message, said data message having a wake-up section, which conveys data at a first rate, followed by a session section, which conveys data at a second rate, said second rate being greater than said first rate, wherein said means adapted to receive said interrogation signal operates continuously; a power manager having an input coupled to said stripping means and having an output, said power manager configured to continuously monitor for and detect a predetermined identification code from said wake-up section of said data message, and, when said predetermined identification code is detected, coupling an internal power source to said output; and a controller having a power input coupled to said power manager output and having a data input coupled to said stripping means, said controller being configured to process said session section of said data message and to at least occasionally transmit an RF response signal if said power manager detects said predetermine identification code, wherein; said wake-up section of said data message combines a data signal and a clock signal; and said power manager comprises a decoder which is configured to separate said clock signal from said data signal. - View Dependent Claims (17, 18, 19)
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Specification