How to distinguish between contact IC cards and non-contact IC cards? It's actually very simple. IC cards are generally divided into two types based on the form of data transmission with the outside world: contact IC cards and non-contact IC cards. The following will take you to understand the differences between these two types of IC cards.
1. The contact type IC card chip is encapsulated in PVC material cards, with the chip exposed and requiring contact with card slot and other card reading devices to read and write data; The non-contact IC card chip is encapsulated in PVC material, and data can be read by remote induction with the card reading device through the wireless waves of the chip in the card. In contrast, non-contact IC cards have good confidentiality, high security performance, large storage capacity, and fast transmission speed. Contact IC card: an IC card that must be inserted into the host card slot and can only transmit data through wired means. This card is prone to wear and is afraid of oil stains. The TM card in the United States is a type of contact IC card. The commonly used resident social security card is a contact type IC card.
Contact IC card is based on the principle of obtaining working voltage and exchanging data: the contact IC card directly contacts and connects the integrated circuit of the card with the external interface circuit through the metal electrode contacts on its surface. The external interface circuit provides power for the operation of the integrated circuit in the card, and exchanges data (communication) with the reader/writer through serial communication.
2. Introduction to non-contact IC card, also known as RF card, successfully solves the problem of passive (no power supply in the card) and contactless, and is a major breakthrough in the field of electronic devices. Non contact IC cards are mainly used in automatic toll collection systems for public transportation, tourist annual passes, social security, and subways, as well as in access control management, identity verification, and electronic wallets. The public transportation IC card is contactless. As long as the IC card is within a certain distance from the card reader, the card reader can read the data inside the card without the need for physical contact between the IC card chip and the card reader.
The non-contact IC card and the card reader complete reading and writing operations through radio waves. The communication frequency between the two is 13.56MHz. The non-contact IC card itself is a passive card. When the reader/writer performs read and write operations on the card, the signal emitted by the reader/writer is composed of two parts: one is the power signal, which is received by the card and generates an instantaneous energy with its own L/C to supply the chip with work. The other part is instructions and data signals, which command the chip to complete data reading, modification, storage, etc., and return signals to the reader/writer to complete a read/write operation. Readers and writers are generally composed of microcontrollers, dedicated intelligent modules, and antennas, and are equipped with communication interfaces with PCs, printing ports, I/O ports, etc., for application in different fields.
