Chip card with a contactless energy supply and data transmission devices

US5999713A · kind A · utility

Assignees

• Siemens Aktiengesellschaft · DE
• U.S. Philips Corporation · US

Inventors

• Robert Reiner · Neubiberg, DE
• Gerhard Schraud · Mering, DE
• Walter Strubel · Hanerau-Hademarschen, DE
• Heiko Fibranz · Hersbruck, DE
• Joachim Weitzel · Markt Indersdorf, DE
• Dominik Berger · Graz, AT
• Wolfgang Eber · Zeltweg, AT
• Gerald Holweg · Graz, AT

Key dates

• Filing date: Aug 26, 1996
• Grant date: Dec 7, 1999
• Expiry date: Aug 26, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G06K19/0723
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

A chip card includes a semiconductor chip that contains at least one memory. In order to supply energy to the chip and to provide for bi-directional data transmission from and to the chip, both contacts and a device for contactless data transmission are provided. A triggerable switch device which is provided on the chip connects the memory either to the contacts or to the device for contactless data transmission as a function of a state of an output signal of a logic circuit connected to at least a voltage supply contact. The switch device assumes a position of repose when it is not triggered and in that position it connects the memory to the device for contactless data transmission, while only upon application of a voltage to the supply voltage contact, triggered by the logic circuit, does it connect the contacts to the memory.