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Contactless communication device, contactless IC card, and mobile information terminal

A non-contact, communication device technology, applied in measurement devices, near-field transmission systems using transceivers, record carriers used by machines, etc., can solve problems such as reducing the internal processing speed of the PICC, improve data processing efficiency, increase Circuit size, effect of reducing processing time

Inactive Publication Date: 2012-05-23
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the communication distance can be increased by reducing the current consumption of the PICC, the internal processing speed of the PICC must be reduced in order to reduce the current consumption

Method used

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  • Contactless communication device, contactless IC card, and mobile information terminal
  • Contactless communication device, contactless IC card, and mobile information terminal
  • Contactless communication device, contactless IC card, and mobile information terminal

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0091] figure 1 A schematic structure of the contactless communication device 1 according to the first embodiment of the invention is shown. Using MOS integrated circuit fabrication techniques will figure 1 The shown contactless communication device 1 is formed over a single semiconductor substrate composed of, for example, single crystal silicon, but is not limited thereto. The non-contact communication device 1 performs RF communication with an external device such as a reader / writer (not shown). Such as figure 2 As shown, the non-contact communication device 1 operates with power of induced electromotive force obtained by approaching an external device, and performs "reception", "transmission", and "internal processing" during supply of operable power, so The "receiving" is to receive data sent from an external device to the non-contact communication device 1, the "send" is to send data from the non-contact communication device 1 to an external device, and the "internal...

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PUM

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Abstract

There is included a detection unit for detecting a magnitude of a surplus of a direct current to a source voltage generated by a voltage generation unit generating the source voltage from the direct current obtained by rectifying a signal inputted from an antenna terminal. A data processing unit operating at the source voltage and performing data processing on a transmission / reception signal includes a clock control unit for determining a frequency of a clock signal for the data processing based on the magnitude of the surplus current detected by the detection unit in a state where a frequency of the clock signal is set to a predetermined reference frequency. Since the power consumed by the data processing unit at the time of detecting the surplus of the direct current is determined by the specific reference frequency, the surplus of the direct current can be detected as an absolute surplus.

Description

[0001] Cross References to Related Applications [0002] The disclosure of Japanese Patent Application No. 2010-257057 filed on Nov. 17, 2010, including specification, claims, drawings and abstract, is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to non-contact communication devices for electronic money, transportation ticket gates, and the like, and non-contact IC cards, and particularly relates to technologies effectively applied to semiconductor devices such as those used for IC cards. Background technique [0004] According to international standards ISO / IEC14443 and ISO / IEC18092, an IC card with a contactless interface is called a PICC, and performs RF (Radio Frequency) communication with a reader / writer called a PCD. ISO stands for International Organization for Standardization, IEC stands for International Electrical Commission, PICC stands for proximity card, and PCD stands for proximity coupling device. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00G06K19/07G06F1/26G06F1/28G06F1/32H04B5/48
CPCG06K19/0712
Inventor 鸟山显宏渡边一希进藤诚丰岛诚丹野洋祐
Owner RENESAS ELECTRONICS CORP