METHOD OF CONTACTLESS DATA TRANSMISSION - INFINEON TECHNOLOGIES AG

Title:

METHOD OF CONTACTLESS DATA TRANSMISSION

Document Type and Number:

Japanese Patent JP2005295569

Kind Code:

A

Abstract:

To provide a method of contactless data transmission in which a consumed current of a digital circuit of a transponder is reduced sharply.

This method relates to a method of contactless data transmission between a write/read device and the transponder which is driven with the write/read device. In the method, in order to inform transmission of modulated data (fD), the write/read device transmits a trigger pulse to a transmitting direction and/or receiving direction. When data are received, the transponder generates at least a clock signal (FTA). In order to transmit the modulated data, the transponder evaluates a synchronized signal (SS) transmitted by the write/read device. In that case, data transmission of transmitting direction and/or receiving direction is performed without a synchronous system clock.

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Inventors:

KARGL WALTER

Application Number:

JP2005106917A

Publication Date:

October 20, 2005

Filing Date:

April 01, 2005

Export Citation:

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Assignee:

INFINEON TECHNOLOGIES AG

International Classes:

G06F3/00; G06K7/00; H04B5/02; G06K7/08; G06K17/00; G06K19/067; H04B1/59; H04Q5/22; (IPC1-7): H04B1/59; H04B5/02

Attorney, Agent or Firm:

Hidesaku Yamamoto
Takaaki Yasumura
Natsuki Morishita

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