General description：

The MFRC522 is a highly integrated reader/writer IC for contactless communicationat 13.56 MHz. The MFRC522 reader supports ISO/IEC 14443 A/MIFARE and NTAG.The MFRC522’s internal transmitter is able to drive a reader/writer antenna designed tocommunicate with ISO/IEC 14443 A/MIFARE cards and transponders without additionalactive circuitry. The receiver module provides a robust and efficient implementation fordemodulating and decoding signals from ISO/IEC 14443 A/MIFARE compatible cards andtransponders. The digital module manages the complete ISO/IEC 14443 A framing anderror detection (parity and CRC) functionality.The MFRC522 supports MF1xxS20, MF1xxS70 and MF1xxS50 products. The MFRC522supports contactless communication and uses MIFARE higher transfer speeds up to848 kBd in both directions.MFRC522Standard performance MIFARE and NTAG frontendRev. 3.9 — 27 April 2016112139Product data sheetCOMPANY PUBLICMFRC522 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved.Product data sheetCOMPANY PUBLICRev. 3.9 — 27 April 2016112139 2 of 95NXP Semiconductors MFRC522Standard performance MIFARE and NTAG frontend

The following host interfaces are provided:

• Serial Peripheral Interface (SPI)

• Serial UART (similar to RS232 with voltage levels dependant on pin voltage supply)

• I2C-bus interface

Features and benefits：

 Highly integrated analog circuitry to demodulate and decode responses

 Buffered output drivers for connecting an antenna with the minimum number ofexternal components

 Supports ISO/IEC 14443 A/MIFARE and NTAG

 Typical operating distance in Read/Write mode up to 50 mm depending on theantenna size and tuning

 Supports MF1xxS20, MF1xxS70 and MF1xxS50 encryption in Read/Write mode

 Supports ISO/IEC 14443 A higher transfer speed communication up to 848 kBd

 Supports MFIN/MFOUT

 Additional internal power supply to the smart card IC connected via MFIN/MFOUT

 Supported host interfaces

 SPI up to 10 Mbit/s

 I2C-bus interface up to 400 kBd in Fast mode, up to 3400 kBd in High-speed mode

 RS232 Serial UART up to 1228.8 kBd, with voltage levels dependant on pinvoltage supply

 FIFO buffer handles 64 byte send and receive

 Flexible interrupt modes

 Hard reset with low power function

 Power-down by software mode

 Programmable timer

 Internal oscillator for connection to 27.12 MHz quartz crystal

 2.5 V to 3.3 V power supply

 CRC coprocessor

 Programmable I/O pins

 Internal self-test