Non-contact IC card, also called "contactless IC card" or "radio frequency card", is a new technology developed in the world in recent years. Its chips are all enclosed in the card, no exposure, not only that, in the card body is also embedded with a micro-antenna, is embedded chip and card reader intercommunication, it is through radio waves or electromagnetic induction To exchange information. It successfully combines radio frequency identification technology and IC technology to solve the passive (card power) and contact-free these two major challenges, is a major breakthrough in the field of electronic devices.
The advantage of this technology is that the exchange of information does not require any contact between the card and the card reader. The memory capacity of this kind of card is generally between 256b and 72kb. At present, the most popular technologies are Legic, Mifare, Desfire, iCode and HID iclass, etc., and also comply with the chip of ISO14443 A & B communication protocol. Usually used for access control, bus charges, subway charges need to "flash through" the occasion.
Contact IC chip chip metal contacts exposed, you can visually see the data stored in the card body embedded integrated circuit (IC), through the chip's eight contacts with the read-write device contact, exchange of information. The current use of IC card belongs to this. In terms of storage media, the two most common types of contact cards are memory cards (MEMORY cards) and processor cards (CPU cards). The memory card can only store 256b to 128kb of data, while the processor card can store data while performing similar computer operations.