Keychain card features, custom keychain card manufacturing manufacturer

Features of keychain cards
    The product casing of keychain cards is made from refined molds and high-grade corrosion-resistant, high-temperature resistant materials by injection. Inside the keychain cards, RFID card chips can be encapsulated, assembled by ultrasonic welding. Chips that can be packaged in keychain cards include: Philips S50 chip, Philips S470 chip, TK4100 chip, FM1108 Fudan chip, and others.
    Keychains do not fade when clipped, the product is waterproof and corrosion-resistant, with a compact and durable appearance. Keychain cards can be hung on keys and are very convenient to carry. There are various styles of keychain cards to choose from.
    Keychain cards can package multiple chips of 125Khx/13.5MHz, allowing selection according to needs. Keychain cards can be compositely packaged. The main application areas of keychain cards include: all-in-one cards, parking lots, attendance, access control systems, and more.
    Keychain cards are currently a very commonly used type of smart card in daily life. Keychain cards have appeared on the market due to their flexible and compact appearance, have a wide range of applications, and are a very convenient new type of card.

Keychain card features

The carrier frequency is 125KHZ or 13.56MHZ; The modulation method for sending data to the card reader is loading amplitude modulation;
The in-card data encoding uses BPSK phase-shift keying with strong anti-interference capability;
The data transmission rate to the card reader is 3.9kbps or 6.62kbps;
Data storage uses EEPROM, with data retention lasting over 10 years; The data storage capacity is 64 bits, including manufacturer, publisher, and user code;
Once the card number is written before sealing, it cannot be changed, ensuring absolute uniqueness and security;

How the keychain card works

The system consists of a card, a card reader, and a backend controller. The work process is as follows:
The card reader sends the carrier signal outward via the antenna;
After the card enters the reader's working area, a resonant circuit composed of inductive coils and capacitors receives the carrier signal sent by the card reader. The RF interface module of the chip generates the power voltage, reset signal, and system clock from these signals to "activate" the chip;
The chip read control module encodes the data in memory through phase modulation, modulates it onto the carrier, and sends it back to the card reader via the card's internal antenna;
The card reader demodulates and decodes the received card return signal and sends it to the backend computer; The backend computer handles and controls different applications based on the validity of the card number.

 

Application scope of keychain cards

Keychain cards do not require insertion or removal of cards, avoiding various faults caused by poor mechanical contact. Therefore, they offer outstanding advantages such as easy operation, speed, reliability, and long lifespan, especially suitable for high-traffic environments.

Typical applications: Radio frequency identification fields such as cafeteria meal sales systems, patrol systems, attendance systems, access control systems, and enterprise all-in-one card systems. Keychains are mainly used for identity recognition and addressing control, such as access control, security, attendance, and more. They can also be applied to tickets and discount cards in public places like exhibitions, parks, hotels, and restaurants. As well as logistics, electronic tags, anti-counterfeiting labels, one-time tickets, and other sectors such as production processes, postal parcels, air and rail transportation, product packaging, and transportation, among many other fields.

Although it is only a card reader, it is managed by backend computers, allowing it to be applied to certain areas even when it involves billing management, such as cafeteria meal fee management. For specific applications, cardholders' personal information can be sent to the backend computer, a database is created, and application software is configured. When used, the card number is transmitted to the backend computer via a card reader, which retrieves the cardholder's personal information from the database and then operates according to the specific application, making its application scope extremely broad.