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Dividing The Smart Card According To The Different Embedded Chip

              (1) Memory card: The card inner chip is electrically erasable programmable read-only memory EEPROM (electrically erasable programmableread-onlymemory), as well as address decoding circuit and instruction decoding circuit. In order to be able to encapsulate it in 0.76mm Plastic card base, specially made into 0.3mm thin structure. The memory card belongs to the passive card, which usually adopts synchronous communication. This card is easy to store, easy to use, and inexpensive to replace magnetic cards on many occasions. But this kind of IC card does not have the secrecy function, therefore generally uses for to store does not need the confidential information. For example, medical emergency cards, catering customers menu cards. The common memory card has Atmel company's AT24C16, AT24C64 and so on.Smart Card

              (2) Logical encryption card: This kind of card besides has the memory card's EEPROM, also has the encryption logic, must carry on the password authentication before each read/write card. If the password verification error is repeated several times, the card will be self-locking and become a dead card. In terms of data management, password verification and identification, the logical encryption card is also a passive card, which uses synchronous mode to communicate. This kind of card storage volume is relatively small, the price is relatively cheap, applicable to have a certain confidentiality requirements of the occasion, such as canteen dining card, telephone card, public utility card. The common logic encryption card has Siemens company's SLE4442, SLE4428, Atmel Company's at88sc1608 and so on.Smart Card

             (3) CPU card: This kind of chip inside contains the microprocessor unit (CPU), memory unit (RAM, ROM and EEPROM), and the input/output interface unit. Where RAM is used to store intermediate data in the operation process, the ROM is cured with an in-chip operating system cos (card operatingsystem), and the EEPROM is used to store the cardholder's personal information and information about the issuing unit. CPU Management information plus/decryption and transmission, strictly guard against illegal access card information, found several times illegal access, will lock the corresponding information area (also available high level a command unlock). CPU card capacity is very small, the price is higher than the logic encryption card. But CPU card's good processing ability and superior confidentiality can make it become the main direction of IC card development. CPU card is suitable for occasions with high confidentiality requirements, such as financial card, military secret card and so on. The international comparison of the name of the CPU card providers have Gemplus, G&D, Schlumberger and so on.Smart Card