Dual-mode data carrier and circuit for such a data carrier with potential cut-off for at least one contact terminal

• Main Authors: Thüringer, Peter, Eber, Wolfgang, Berger, Dominik J
• Format: Patent
• Language: English
• Published: 02.04.2002

The invention relates to a data carrier which can be operated in a contact-bound mode and in a contactless mode and which includes the means specified hereinafter, namely a transmission contact and a further transmission contact which are both mechanically accessible from outside the data carrier, and at least one transmission coil which is inductively accessible from outside the data carrier and which serves to receive a useful HF signal in the contactless mode of the data carrier, and a circuit which has a contact terminal connected to the one transmission contact and which has a further contact terminal connected to the further transmission contact and which includes supply voltage generating means to which a received useful HF signal can be applied and by which a supply voltage for various circuit sections of the circuit of the data carrier can be derived from an applied useful HF signal. A data carrier () which can be operated in a contact-bound mode and in a contactless mode and a circuit (A) for such a data carrier () has supply voltage generating means (), for deriving a supply voltage (VDD) for various circuit sections of the data carrier () and of the circuit (A) from a received useful HF signal (HF), and additional switching means () by means of which the application of a potential (VDD), which appears as a result of the supply voltage generated by the supply voltage generating means (), to at least one contact terminal (A) can be inhibited.