Microcircuit chip card with contact and contactless operating mo

Details Microcircuit chip card with contact and contactless operating mo Microcircuit chip card with contact and contactless operating mo

1999-01-07

1999-12-21

Lee, Michael G

Registers

Records

Conductive

235439, 235451, 902 26, G06K 1906

Patent

active

060037776

ABSTRACT:
A microcircuit with two contact and non-contact operating modes, including communication device (2) specific for the non-contact operating mode, communication device (3) specific for the contact operating mode, electronic circuit (4) common to both operating modes, a coil (L) for receiving an AC voltage (Va) by induction, a rectifier circuit (Pd) for rectifying the AC voltage (Va) to give a first microcircuit power supply voltage (Vcc1), at least one power supply contact (p1) for receiving a second microcircuit power supply voltage (Vcc2) a distribution line (5) for distributing the first (Vcc1), or second (Vcc2) power supply voltages, a switch circuit (6, 13) between the power supply contact (P1) and the distribution line (5), and controller (7, 8) for controlling the switch circuit, which controller (7, 8) are arranged to sense the AC voltage (Va) across the terminals of the coil (L), and close the switch circuit (6, 13) when the second power supply voltage (Vcc2) is present on the power supply contact, or give priority to opening the switch circuit when the AC voltage (Va) is present across the terminals of the coil.

REFERENCES:
patent: 4837556 (1989-06-01), Matsushita et al.
patent: 5206495 (1993-04-01), Kreft
patent: 5285370 (1994-02-01), Axer et al.
patent: 5362954 (1994-11-01), Komatsu
patent: 5610384 (1997-03-01), Goto
patent: 5670772 (1997-09-01), Goto
patent: 5671254 (1997-09-01), Nagata et al.
patent: 5831348 (1998-11-01), Nishizawa
patent: 5898738 (1999-04-01), Nagata et al.

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