ID Card Internal Structure,

- Aug 15, 2019-

ID card internal structure, Zhengdafei smart card ID card ID card internal structure,

Zhengdafei smart card to understand the internal structure of the contact ID card! The ID card is a THRC12/13 read-only contactless card. The internal structure of the ID card is mainly composed of a chip and an inductive antenna. It senses the power supply by the card reader and reads out the unique card number stored in the chip EEPROM. The card number is written once before the card is sealed, and cannot be changed after the card is sealed.


Passive and contactless are the two most prominent features of the chip.

A)  The RF interface circuit is a key core technology. It receives RF energy from the reader, generates power and clock for the chip, and uses phase shift keying and load amplitude modulation.

B)  The technology realizes wireless communication between the card and the card reader.

C)  The non-contact ID card has the outstanding advantages of convenient operation, quickness and reliability, and has been widely used.

     (1) Main features of the ID card:The internal structure of the ID card, the internal chip of the ID card, the carrier frequency is 125KHZ (THRC12) or 13.56MHZ (THRC13); the modulation mode of the data transmitted by the card to the card reader is load amplitude modulation;The data encoding in the card adopts BPSK phase shift keying method with strong anti-interference ability;The card-to-reader data transfer rate is 3.9 kbps (THRC12) or 6.62 kbps (THRC13);Data storage uses EEPROM, data retention time is more than 10 years; data storage capacity is 64 bits, including manufacturer, publisher and user code;The card number cannot be changed after it is written before the card is sealed, absolutely ensuring the uniqueness and security of the card number;In addition to being packaged into a standard card shape, the THRC13 chip can be packaged into a variety of shapes, such as chips, depending on the application.

     (2) Working principle of ID card:The internal structure of the ID card, the internal system consists of a card, a card reader and a background controller. The working process is as follows:The card reader transmits the carrier signal to the outside through the antenna;After the card enters the working area of the card reader, the resonant circuit composed of the inductor coil and the capacitor in the card receives the carrier signal transmitted by the card reader, and the RF interface module of the chip in the card generates the power supply voltage, the reset signal and the system clock from the signal. To make the chip "activate";The chip reading control module modulates and encodes the data in the memory on the carrier, and sends the data back to the card reader through the card antenna;The card reader demodulates and decodes the received card return signal and sends it to the background computer. The background computer performs corresponding processing and control for different applications according to the legality of the card number.

    (3) Types of ID cards:ID thick card: thickness 1.8mm, standard card size, is the most economical RF IC card, with ID number, with a portable hole, can be screen printed LOGO text information;Standard thin card: thickness 0.8mm, standard card size, can be offset, screen printing, print photos;Non-standard thin card: thickness 1.05mm, standard card size can be offset, screen printing, print photos;

    (4) ID card application range:Compared with the contact type IC card, the non-contact type ID card does not need to be inserted or removed, avoiding various faults caused by poor mechanical contact, and thus has the advantages of convenient operation, quickness, reliability, long life, and the like, and is particularly suitable for human flow. Big occasion. Typical applications: radio frequency identification in the canteen sales system, patrol system, attendance system, access control system, corporate card system.THRC12/13 non-contact ID card can be mainly used in identification and addressing control, such as access control, security, attendance, etc., and can also be extended to tickets, discount cards for public places such as exhibitions, parks, hotels, restaurants, etc. Wait. And in the production process, postal parcels, aviation rail transport, product packaging, transportation and other departments of logistics, electronic labels, anti-counterfeiting signs, one-time tickets and many other fields. Although it is only a read-only card, with the background computer control management, even the problems related to charge management can be applied to a certain range, such as canteen dining charge management. For specific applications, the cardholder's personal data can be sent to the background computer, the database is established and the application software is configured.


When used, the card number is transmitted to the background computer through the card reader, and the cardholder's individual is retrieved from the database. The data is then manipulated according to the specific application, so the scope of application is extremely broad.