Chip-card with mode switching between contactless and contact-coupled mode
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United States of America Patent
Stats
-
Jan 2, 2001
Grant Date -
N/A
app pub date -
Feb 27, 1998
filing date -
Jun 2, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A chip card is operable in a contactless and contact-coupled mode. For operation in the contactless mode, the chip card has an antenna coil and rectifier. In the contactless mode, the chip card receives an AC signal. The rectifier provides a rectified received AC signal. The rectified signal is used for powering internal circuitry of the chip card. The chip card further has a recognition circuit that recognizes whether an AC signal is actually received by the antenna coil. If the AC signal is recognized, the recognition circuit switches the chip card to the contactless mode. If no AC signal is recognized, the recognition circuit switches the chip card to the contact-coupled mode.
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