IC chip for identification, method for reading out data therefrom, and method for writing data thereinto

• US 20050206504A1
• Filed: 05/26/2005
• Published: 09/22/2005
• Est. Priority Date: 12/03/2003
• Status: Active Grant

• Current Assignee: Fec Co., Ltd., Government of Malaysia
• Original Assignee: Fec Co., Ltd., Government of Malaysia
• Inventors: Kobayashi, Hideki, Taniguchi, Shuhei, Sugimura, Shiro
• Granted Patent: US 7,598,864 B2
• Time in Patent Office: Days
• US Class Current: 340/10.340
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: G06K 19/0728 the arrangement being an optical or sound-based communication interface
• CPC Class Codes: G06K 19/145 at least one of the further markings being adapted for galvanic or wireless sensing, e.g. an RFID tag with both a wireless and an optical interface or memory, or a contact type smart card with ISO 7816 contacts and an optical interface or memory
• CPC Class Codes: G07D 7/01 Testing electronic circuits therein

Abstract

In order to eliminate limitation upon the frequency of a carrier wave from externally, this IC chip for identification includes: a power supply section which receives this carrier wave from outside and creates an internal power supply; a clock signal generation section for read out which generates an internal clock signal for read out based upon a clock signal pulse which is superimposed upon an optical signal from externally; a memory section; and an output section which serially reads out data in the memory section according to the internal clock signal for read out, and load modulates the carrier wave from outside based thereupon.

Claims

1. An IC chip for identification, comprising:

a power supply section which takes advantage of a carrier wave from outside to create an internal electrical current;

a clock signal generation section for read out which generates an internal clock signal for read out based upon a clock signal pulse which is superimposed upon an optical signal from outside;

a memory section; and

an output section which serially reads out data in said memory section according to said internal clock signal for read out, and load modulates said carrier wave from outside based thereupon.

2. An IC chip for identification as described in claim 1, further comprising a generation section for a clock signal for writing in which generates an internal clock signal for writing in based upon a clock signal pulse which is superimposed upon said carrier wave, and a write in section which serially reads in data which is superimposed upon said optical signal according to said internal clock signal for writing in, and stores it in said memory section.

3. An IC chip for identification as described in claim 2, wherein said write in section detects overflow of said data, and blocks said memory section so that writing in to it becomes impossible.

4. An IC chip for identification as described in claim 3, wherein said generation section for a clock signal for writing in discriminates a clock signal pulse which is superimposed upon said carrier wave.

5. An IC chip for identification as described in claim 1, further comprising, upon an on-chip antenna which is connected to said output section, a bump contact which is connected to an external antenna.

6. A method for reading out data from an IC chip for identification, wherein:

an internal clock signal for read out is generated based upon a clock signal pulse which is superimposed upon an optical signal from outside; and

data which is stored in a memory section is serially read out according to said internal clock signal for read out, and said carrier wave from outside is load modulated based thereupon.

7. A method for writing in data to an IC chip for identification, wherein:

an internal clock signal for writing in is generated based upon a clock signal pulse which is superimposed upon a carrier wave from outside;

data which is superimposed upon an optical signal from outside is serially stored according to said internal clock signal for writing in; and

the data which has been stored is written into a memory section, and said memory section is blocked so that writing in to it becomes impossible.