Non-contact IC card

Details Non-contact IC card Non-contact IC card

1990-10-31

1993-05-18

Pitts, Harold

Registers

Records

Conductive

235380, 235437, G06K 1906

Patent

active

052123731

ABSTRACT:
In a non-contact IC card, when the card is in a standby mode of operation a CPU provides a command to inhibit the application of a clock signal to digital circuitry including the CPU and/or to inhibit the application of an operating voltage to analog circuitry, except for an antenna circuit and a trigger signal demodulating circuit, so that power consumption in the standby mode is reduced. For transfer of data between the IC card and an external device, a trigger signal derived by demodulating received data in the trigger signal demodulating circuit is used to apply the clock signal to said digital circuitry and the operating voltage to all of the analog circuitry.

REFERENCES:
patent: 5036461 (1991-07-01), Elliott et al.
patent: 5068521 (1991-11-01), Yamaguchi
patent: 5070233 (1991-12-01), Takizawa
patent: 5101410 (1992-03-01), Niimura et al.
patent: 5105074 (1992-04-01), Nara

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