IC card

Details IC card IC card

1991-12-26

1993-07-06

Pitts, Harold

Registers

Records

Conductive

235380, 235382, G06K 1906

Patent

active

052256677

ABSTRACT:
An IC card prevents an internal battery from being, rapidly consumed and internal data from being lost due to frequent use or erroneous starts caused by external noise. The number of starts of the card and the number of erroneous starts thereof are respectively counted by registers in a RAM. When one of these start numbers reaches a set value, the receiving circuit selected is switched to another receiving circuit having a higher threshold value and requiring no bias current, or the threshold value of the receiving circuit is increased by an inhibit circuit so that the internal power consumption of the card is suppressed, and the card is not affected by external noise. In addition, when the value of one of the registers reaches a set value, the external device informs the user of the fact that the value has reached a set value, using sound or a visual display.

REFERENCES:
patent: 5157247 (1992-10-01), Takahira

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