NXP公司的MFRC522 是13.56 MHz 無接觸通信的高度集成的讀/寫IC,支持ISO/IEC 14443 A/MIFARE模式,兩個方向的傳輸速率高達848 kBd. MFRC522工作電壓2.5V到3.3V,提供SPI,串行UART和I2C總線接口,具有CRC協(xié)處理器和可編程I/O引腳,內部有自測試.本文介紹MFRC522主要特性, 簡化和詳細方框圖, 讀/寫模式, 總線接口圖以及典型應用方框圖.

MFRC522: Contactless reader IC

The MFRC522 is a highly integrated reader/writer IC for contactless communication at 13.56 MHz. The MFRC522 reader supports ISO/IEC 14443 A/MIFARE mode.The MFRC522’s internal transmitter is able to drive a reader/writer antenna designed to communicate with ISO/IEC 14443 A/MIFARE cards and transponders without additional active circuitry. The receiver module provides a robust and efficient implementation for demodulating and decoding signals from ISO/IEC 14443 A/MIFARE compatible cards and transponders. The digital module manages the complete ISO/IEC 14443 A framing and error detection (parity and CRC) functionality.

The MFRC522 supports MF1xxS20, MF1xxS70 and MF1xxS50 products. The MFRC522 supports contactless communication and uses MIFARE higher transfer speeds up to 848 kBd in both directions.

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

MFRC522主要特性:

Highly integrated analog circuitry to demodulate and decode responses

Buffered output drivers for connecting an antenna with the minimum number of external components

Supports ISO/IEC 14443 A/MIFARE

Typical operating distance in Read/Write mode up to 50 mm depending on the antenna 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 pin voltage 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


圖1.MFRC522簡化方框圖

圖2.MFRC522詳細方框圖

圖3.MFRC522讀/寫模式

圖4.MFRC522 I2C總線接口圖

圖5.MFIN和MFOUT信號路經圖

圖6.MFRC522典型應用方框圖

詳情請見:
http://www.nxp.com/acrobat_download/datasheets/MFRC522_33.pdf