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Programmable selective wake-up for radio frequency transponder

A transponder, remote keyless technology, applied to record carriers, computer parts, instruments, etc. used in machines, can solve problems such as wake-up of RKE devices, and achieve the effect of shortening battery life

Inactive Publication Date: 2007-05-16
MICROCHIP TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that when the transponder receiver is affected by noise sources such as electromagnetic radiation (EMR) emanating from eg television and computer monitors having substantially the same frequency as the interrogation signal, the RKE device will be woken up unnecessarily

Method used

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  • Programmable selective wake-up for radio frequency transponder
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  • Programmable selective wake-up for radio frequency transponder

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Embodiment Construction

[0036] Referring now to the drawings, there are shown schematically details of various exemplary embodiments of the invention. Like elements in the various figures will be represented by the same number, and like elements will be represented by the same number with a different lowercase letter suffix.

[0037] Referring to FIG. 2 , it illustrates a schematic block diagram of an exemplary embodiment of a remote keyless entry (RKE) system according to the present invention. The RKE system (which is generally indicated by reference number 200) includes: a base station 202, which is typically disposed in a vehicle in automotive applications or in a residence or office in secure entry applications; A communicating RKE transponder 204, such as a key fob. Base station 202 may include a radio frequency receiver 206 , antenna 210 and a low frequency transmitter / reader 208 and associated antenna 212 . Transponder 204 may include a radio frequency transmitter 222 , antenna 218 , a low ...

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PUM

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Abstract

The invention a remote keyless entry (RKE) transponder which 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

technical field [0001] The present invention relates generally to inductively coupled magnetic field transmission and detection systems, such as remote keyless entry (RKE) and passive keyless entry (PKE) systems, and more particularly to a method for reducing false wake-ups in such systems. equipment and methods. Background technique [0002] The use of Remote Keyless Entry (RKE) systems in automotive and security applications has increased significantly in recent years. A conventional Remote Keyless Entry (RKE) system consists of an RKE transmitter and a base station. The RKE transmitter has an activation button. When an activation button is pressed, the RKE transmitter transmits corresponding radio frequency data to the base station. The base station receives the data and if the received data is valid then takes appropriate action such as unlocking / locking the doors or trunk. In a conventional RKE system, data is transmitted from the RKE transmitter to the base station...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/16G06K19/07
Inventor 托马斯·尤博克·李詹姆斯·B·诺兰史蒂夫·维尼尔兰迪·亚奇艾伦·兰费尔
Owner MICROCHIP TECH INC
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