Toutch and nou-toutch type working-mode changing-over method in double interface card

Abstract

The present invention discloses a change-over method of contact type and non-contact type working mode of double-interface card, and is aimed at providing a method capable of implementing seamless transient change-over of contact type and non-contact type working mode in double-interface card. In said invention the default state of system is non-contact type working mode, and the priority of contact type working mode is higher than that of non-contact type working mode; when the contact type active information and non=contact type active information are simultaneously appeared, the contact type working node is activated, and the non-contact type working mode is shielded; the non-contact type working mode when which is activated or retained can be interrupted by contact type working mode, and the contact type working mode when which is activated or retained can not be interrupted by non-contact type working mode. Said invention is applicable to the field of intelligent card.

Description

technical field [0001] The invention relates to a method for switching working modes in the field of smart cards, more specifically, to a method for switching working modes between contact and non-contact modes in dual-interface cards. Background technique [0002] Currently, dual interface cards (Dual Interface SmartCard) are being used in the field of international smart cards, which mainly provide two ways to interface with the outside world on one card at the same time: contact and non-contact, usually also called "dual interface". Card". The dual-interface card combines the advantages of contact cards and contactless cards in independent use, and has more complete functions. It is a multi-functional card. [0003] The appearance of the dual-interface card is similar to that of a contact IC card. The surface is made of metal contacts that conform to the international standard ISO7816. The dual-interface card shares a central processing unit CPU for management and share...

AI Technical Summary

Problems solved by technology

[0005] 1. It is easy to cause short circuit: when the dual-interface card works in the non-contact mode, the voltage generated by the RF module is directly applied to the contact voltage contact, and when the dual-interface card works in the non-contact mode, the contact The contact of the chip is exposed outside, once the voltage contact and the ground contact are turned on, it will cause a short circuit of the chip;

[0006] 2. The chip works in a 3V / 5V mixed voltage environment: the RF rectified voltage in the non-contact working mode is about 3V, while the contact power supply voltage is 5V (ISO 7816 Type A interface), so that the main part of the chip works The voltage is 3V for a while, and 5V for a while. The voltage swing is too large, which will damage the stability and service life of the chip; The energy coupled from the antenna provides a voltage of about 3V to the chip through rectification and filtering, and this potential difference will cause the current to flow back into the RF module;

[0007] 3. Poor anti-interference ability: During the working process of the dual-interface card, there are various interferences, and when the dual-interface card works in the contact mode, the RF module may be subjected to electromagnetic interference and generate false signals. The switching method often leads to wrong switching of the working mode due to the failure to deal with various interferences or improper handling.

[0008] These deficiencies in the prior art have caused the disadvantages of poor stability and short service life of dual-interface IC cards in use.

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