Non-contact IC card

Details Non-contact IC card Non-contact IC card

1994-06-29

1996-10-29

Hajec, Donald T.

Registers

Records

Conductive

235493, 902 26, G06K 19067

Patent

active

055699030

ABSTRACT:
A contact type IC card includes a power supply terminal, a reset terminal and an input/output terminal connected to an external device, an input/output circuit for receiving data from and delivering data to an external device through the input/output terminal, a data processing circuit connected to the input/output circuit for processing data, a memory circuit connected to the data processing circuit for storing data, and an internal reset signal generator for latching a predetermined potential when source power is applied from the external device through the power supply terminal, generating an internal reset signal by using the latched potential to bring the circuits info reset states, and stopping generation of the internal reset signal to release the circuits from reset states when a reset release signal is input from the external device through the reset terminal. A non-contact type IC card includes, as specific parts, a transmitting/receiving circuit, a battery and an oscillation unit for stopping oscillation of a clock signal and starting the oscillation of a clock signal to supply the clock signal to the data processing circuit when a trigger signal is received through the transmitting/receiving circuit. A reset sequence is performed reliably and consumption of the battery is suppressed.

REFERENCES:
patent: 4372699 (1983-02-01), Quinn, Jr.
patent: 4692601 (1987-09-01), Nakano
patent: 4800255 (1989-01-01), Imran
patent: 5068521 (1991-11-01), Yamaguchi
patent: 5105074 (1992-04-01), Nara
patent: 5274221 (1993-12-01), Matsubara
Nikkei Electronics, Sep. 1986, No. 44, pp. 133-144.
"Data Carrier", Chapter 5, pp. 101-106-no date.

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