Card Sensor Module RFID-RC522



The RC 522 is a 13.56 MHz RFID module that is based on the MFRC 522 controller from NXP semiconductors. The module can supports I2C, SPI and UART and normally is shipped with a RFID card and key fob. It is commonly used in attendance systems and other person/object identification applications. The RC 522 is a RF Module that consists of a RFID reader, RFID card and a key chain. The module operates 13.56 MHz which is industrial (ISM) band and hence can be used without any license problem. The module operates at 3.3 V typically and hence commonly used in 3.3 V designs.  It is normally used in application where certain person/object has to be identified with a unique ID. The key chain has 1 kB memory in it which can be used to stored unique data. The RC 522 reader module can both read and write data into these memory elements. The reader can read data only form passive tags that operate on 13.56 MHz. The RC 522 has an operating voltage between 2.5 V to 3.3 V and hence is normally powered by 3.3 V and should be used with 3.3 V communication lines. But, the communication pins of this module are 5 V tolerant and hence it can be used with 5 V micro controllers also like Arduino without any additional hardware. The module supports SPI, IIC and UART communication but out of these SPI is often used since it is the fasted with a maximum data rate of 10 Mbps.


  • 13.56 MHz RFID module
  • Operating voltage: 2.5 V to 3.3 V
  • Communication : SPI, I2C protocol, UART
  • Maximum Data Rate: 10 Mbps
  • Read Range: 5 cm
  • Current Consumption: 13-26 mA
  • Power down mode consumption: 10 uA (min)


  • Vcc: Used to Power the module, typically 3.3 V is used
  • RST: Reset pin – used to reset or power down the module
  • Ground: Connected to Ground of system
  • IRQ: Interrupt pin – used to wake up the module when a device comes into range
  • MISO/SCL/Tx: MISO pin when used for SPI communication, acts as SCL for I2c and Tx for UART.
  • MOSI: Master out slave in pin for SPI communication
  • SCK: Serial Clock pin – used to provide clock source
  • SS/SDA/Rx: Acts as Serial input (SS) for SPI communication, SDA for IIC and Rx during UART
  • Automatic billing systems
  • Attendance systems
  • Verification/Identification system
  • Access control systems
  • Additional information
  • Gross weight: 11 g
  • Manufacturer part number: RFID-RC522


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