Programmable selective wake-up for radio frequency transponder

Abstract

A remote keyless entry (RKE) transponder has a programmable selective wake-up filter for determining whether the RKE transponder should wake-up to process a received signal. The wake-up filter correlates the timing of an input signal's carrier amplitude on and off time periods to a predefined programmable time period profile for a desired signal which has a certain carrier on time (time period on) and a certain carrier off time (time period off) arranged into a coded “header.” When a received signal matches the predefined time period profile, then the RKE transponder will wake-up to process the incoming signal data. The predefined time period profile may be programmable and may be stored in a header configuration register. Each RKE transponder has unique predefined time period on and time period off profiles.

Description

RELATED PATENT APPLICATION

[0001] This application claims priority to commonly owned U.S. Provisional Patent Application Ser. No. 60 / 564,829; filed Apr. 23, 2004; entitled “Programmable Wake-Up Filter for Radio Frequency Transponder,” by Thomas Youbok Lee, James B. Nolan, Steve Vernier, Randy Yach and Alan Lamphier, which is hereby incorporated by reference herein for all purposes.

[0002] This application is related to commonly owned U.S. patent application Ser. No. ______; filed ______; entitled “Reducing False Wake-Up in a Low Frequency Transponder,” by James B. Nolan, Thomas Youbok Lee, Alan Lamphier, Ruan Lourens and Steve Vernier; U.S. patent application Ser. No. ______; filed ______; entitled “Noise Alarm Timer Function for Three-Axis Low Frequency Transponder,” by James B. Nolan, Thomas Youbok Lee, Steve Vernier and Alan Lamphier; and U.S. patent application Ser. No. ______; filed ______; entitled “Dynamic Configuration of a Radio Frequency Transponder,” by Thomas Youbok Lee,...

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