The concept of IC card was put forward in the early 70s, 40 years, has been widely used in finance, transportation, communications, medical, identity and many other areas.
Separate from according to the form of external data transmission, IC card is with contact and non-contact type.
①Contact IC card
The metal contacts of Contact IC card exposed, it could be seen with your naked eyes, can exchange information with read and write outside through the contacts on the chip.
②Contactless IC card/ Proximity card
Contactless IC card (RFID card) chip all sealed in the card base, no exposed parts, through the radio waves or electromagnetic field induction to exchange information, usually used for access control, bus charges, subway charges and so on "flash" Of the occasion.
③Contactless ID card
ID card, full name identification card (Identification card), used to call "EM card." ID card is THRC12 / 13 read-only non-contact IC card, it relies on the card reader power supply and reads CSN (Card Serial Number) or UID stored in the chip EEPROM, card number written before sealed, after that the card can not be changed. Passive and non-contact is the two most prominent features of the chip, the RF interface circuit is the key core technology, it receives radio frequency energy from the reader, generates power and clock for the chip, and uses phase shift keying and load modulation Technology to achieve wireless communication between the card and the reader.
