Low power addressable data communication device and method

Details Low power addressable data communication device and method Low power addressable data communication device and method

1995-11-14

1997-02-25

Donaghue, Larry D.

Communications: electrical

Continuously variable indicating

With meter reading

34082544, 455 383, 455343, G08B 522, H04B 700, H04Q 302, H04Q 914

Patent

active

056063130

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).

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