RFID Card Reader/Writer 13.56MHZ RC522

The MFRC522 RFID Reader/Writer Module, commonly known as the RC522, is one of the most popular and versatile RFID modules available for hobbyists and professional developers. It is built around the NXP MFRC522 integrated circuit, a highly integrated chip specifically designed for contactless communication at 13.56MHz using the ISO 14443A standard. This module enables bidirectional data transmission—meaning it can both read information from and write information to compatible RFID cards and tags, making it far more powerful than simple read-only RFID readers. The MFRC522 uses advanced modulation and demodulation techniques to handle all types of 13.56MHz passive contactless communication methods and protocols, including support for the CRYPTO1 encryption algorithm used in Mifare products, ensuring secure authentication and data protection. The module is compact (only 40mm × 60mm) and features a SPI interface that requires just a few wires to connect to any microcontroller, significantly reducing PCB space and wiring complexity. Its low operating voltage of 3.3V and minimal current consumption (13–26mA operating, less than 80µA in sleep mode) make it ideal for battery-powered and portable applications. The module supports a wide range of card types including Mifare 1K S50, Mifare 4K S70, Mifare Ultralight, Mifare Pro, and Mifare DESFire, providing excellent flexibility for various access control, identification, and payment systems. With data transfer rates up to 424 kbit/s for card communication and up to 10Mbit/s over SPI, the RC522 delivers fast and reliable performance for demanding RFID applications.

Specifications

• Module Name: MFRC522 (RC522) RFID Reader/Writer
• Main IC: NXP MFRC522
• Operating Frequency: 13.56 MHz
• Operating Voltage: 3.3V DC
• Operating Current: 13 – 26 mA
• Idle Current: 10 – 13 mA
• Sleep Current: < 80 µA
• Peak Current: < 30 mA
• Communication Interface: SPI (also supports I2C and UART)
• Maximum SPI Data Rate: 10 Mbit/s
• Maximum Contactless Data Rate: 424 kbit/s
• Read/Write Distance: 0 – 60 mm (depending on antenna and card)
• Supported Card Types:
• Mifare Classic 1K (S50)
• Mifare Classic 4K (S70)
• Mifare Ultralight
• Mifare Pro
• Mifare DESFire
• ISO 14443 Type A
• Module Dimensions: 40 mm × 60 mm
• Operating Temperature: -20°C to +80°C
• Storage Temperature: -40°C to +85°C
• Relative Humidity: 5% – 95%
• Encryption Support: CRYPTO1 algorithm

Pin Configuration (SPI Mode)

• VCC: 3.3V power supply
• RST: Reset pin
• GND: Ground
• IRQ: Interrupt request (optional)
• MISO: Master In Slave Out (SPI)
• MOSI: Master Out Slave In (SPI)
• SCK: Serial Clock (SPI)
• SDA/SS: Slave Select (SPI)

Applications

• Used in access control systems for offices, homes, and secure facilities.
• Essential in time and attendance tracking for employees and students.
• Employed in library book management for check-in/check-out automation.
• Used in payment systems and cashless transactions.
• Applied in Arduino and Raspberry Pi RFID projects.
• Common in DIY smart door locks and electronic security.
• Used in asset tracking and inventory management.
• Found in public transportation ticketing systems.
• Employed in parking lot access for residents and visitors.
• Used in hotel key card systems for room access.
• Applied in industrial automation for worker authentication.
• Common in event management and ticketing systems.
• Used in vending machines for cashless purchases.
• Found in school and campus ID systems.
• Employed in fitness club and gym membership management.
• Used in smart home automation for user identification.
• Applied in IoT security and authentication.
• Common in medical record systems for patient ID.
• Used in automotive immobilizers and anti-theft systems.
• Found in retail loyalty programs for customer tracking.
• Employed in vehicle access control for gated communities.
• Used in voting and polling systems for identification.
• Applied in container and logistics tracking systems.