<h1>RFID Cards</h1> <p>RFID cards have become an integral part of our daily lives, from accessing office buildings to making contactless payments. My personal journey with this technology began years ago when I first used a keycard for my gym. The convenience was immediately apparent, and it sparked my interest in how these small, unassuming cards function. This experience led me to explore the technical side, and I discovered that my natural aptitude for understanding electronic systems made delving into RFID specifications surprisingly intuitive.</p> <h2>Understanding RFID Card Technology and Specifications</h2> <p>In my view, the true power of RFID lies in its versatility. While many see just a card, I see a sophisticated data exchange system. For instance, a common high-frequency (13.56 MHz) RFID card might use a chip like the NXP MIFARE Classic 1K. The technical parameters for such a card are crucial for system designers.</p> <h3>Technical Parameters and Indicators</h3> <p>Here are some detailed specifications for a typical RFID card model (for example, the Proximity Card Series 3000):</p> <h4>Physical and Electrical Specifications</h4> <ul> <li><strong>Chip Type:</strong> NXP MIFARE Classic EV1 1K (MF1S503x)</li> <li><strong>Operating Frequency:</strong> 13.56 MHz</li> <li><strong>Communication Protocol:</strong> ISO/IEC 14443 Type A</li> <li><strong>Memory:</strong> 1KB EEPROM, organized into 16 sectors with 4 blocks each.</li> <li><strong>Data Retention:</strong> Up to 10 years.</li> <li><strong>Read/Write Distance:</strong> Typically up to 10 cm (depending on the reader).</li> <li><strong>Card Dimensions:</strong> Standard ID-1 format: 85.6mm x 54mm x 0.76mm.</li> <li><strong>Operating Temperature:</strong> -20°C to +50°C.</li> </ul> <p><em>Note: These technical parameters are for reference data. For precise specifications and compatibility, you must contact backend management.</em></p> <h2>Practical and Entertaining Applications of RFID Cards</h2> <p>Beyond security, <strong>RFID cards</strong> have fascinating entertainment uses. I once atte