Composite IC card
AssigneeHitachi, Ltd.
InventorsTakehiro Ookawa, Hiroshi Yoshigi, Tadashi Oonishi, Kazuki Watanabe
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Abstract
An IC card capable of preventing the occurrence of an abnormal state of coupling and thereby preventing malfunction of IC is provided. The IC card is provided with a coupling detecting means for detecting a contact coupling and a non-contact coupling and is also provided with a communication cut-off means which, when there are supplied electric power and a signal for inducing the other coupling during communication by one coupling, cuts off communication so that communication is performed by neither of the couplings.
Claims14
An IC (Integrated Circuit) card which has a semiconductor integrated circuit integrating an internal circuit for communication with an external device, an antenna and a connector, and is capable of supply of electric power and transmission and reception of signals with the external device by either a contact coupling using the connector or a non-contact coupling using the antenna, the IC card comprising:
- coupling detecting means for detecting a contact coupling and a non-contact coupling, and
- communication cut-off means for cutting off the communication so that the communication is not performed on either of the couplings when there are supplied electric power or a signal for inducing the other coupling during communication on one coupling.
An IC (Integrated Circuit) card which has a semiconductor integrated circuit integrating an internal circuit for communication with an external device, an antenna and a connector, and is capable of supply of electric power and transmission and reception of signals with the external device by either a contact coupling using the connector or a non-contact coupling using the antenna, the IC card comprising:
- a first detector for detecting the supply of either electric power or a signal inducing the contact coupling,
- a second detector for detecting the supply of either electric power or a signal inducing the non-contact coupling,
- a first gate circuit which performs disconnection of signals transmitted and received through the connector in accordance with an output signal provided from the second detector, and
- a second gate circuit which performs disconnection of signals transmitted and received through the antenna in accordance with an output signal provided from the first detector,
- wherein the first detector operates irrespective of whether the second detector is in operation or not, and the second detector operates irrespective of whether the first detector is in operation or not.
Dependencies are inferred from the claim text.