An integrated circuit card (IC card) is also called a smart card, an intelligent card, a microcircuit card, or a microchip card. It embeds a microelectronic chip into a card base conforming to the ISO 7816 standard in the form of a card. The communication between the IC card and the reader can be either contact or non-contact. According to the communication interface, the IC card is divided into a contact type IC card, a non-contact type IC, and a dual interface card (having both a contact type and a non-contact type communication interface).
Because of its inherent information security, portability, and relatively standardization, IC cards are increasingly used in identity authentication, banking, telecommunications, public transportation, and yard management, such as second-generation ID cards and banks. Electronic purses, telecommunication SIM cards for mobile phones, bus cards for public transportation, subway cards, parking cards for parking fees, etc. all play an important role in people's daily lives.
IC card is another kind of information carrier after the magnetic card. The IC card refers to an integrated circuit card. A commonly used bus card is a kind of IC card. Generally, a common IC card uses radio frequency technology to communicate with a card reader supporting an IC card. There is a difference between the IC card and the magnetic card. The IC card stores information through the integrated circuit in the card, and the magnetic card records information through the magnetic force in the card. IC cards are generally higher in cost than magnetic cards, but have better confidentiality.
Non-contact IC cards, also known as radio frequency cards, successfully solve the problem of passive (no power in the card) and contactlessness, which is a major breakthrough in the field of electronic devices. Mainly used in public transportation, telecommunications, banking, parking management and other fields. The main functions include security authentication, electronic wallet, data storage and so on. Commonly used access control cards and second-generation ID cards belong to security authentication applications, while bank cards, subway cards, etc. use electronic wallet functions.
The basic principle of IC card work is: RF reader sends a set of fixed-frequency electromagnetic waves to the IC card. There is an LC series resonant circuit in the card. Its frequency is the same as the frequency emitted by the reader, so that under the excitation of electromagnetic waves, the LC The resonant circuit resonates so that there is charge in the capacitor. At the other end of the capacitor, there is a unidirectional conduction electronic pump that sends the charge in the capacitor to another capacitor for storage, when the accumulated charge reaches 2V. This capacitor can be used as a power supply to provide operating voltage for other circuits. It can transmit data in the card or receive data from the reader.