NXP的MFRC522是工作在13.56MHz的无接触通信的高度集成读写器. MFRC522阅读器支持ISO 14443A / MIFARE®模式,它的内部发送器部分能驱动读写器的天线,该天线能和ISO/IEC 14443A/MIFARE®卡进行通信,异频收发高频信号不需要额外的有源电路.它的接收部分能对ISO/IEC 14443A/MIFARE®卡所兼容的信号进行功能强大和有效的解调和译码.它的数字部分能处理完整的ISO/IEC 14443A成帧和误码检测(Parity & CRC). MFRC522支持采用MIFARE®的无接触通信,双向传输速率高达848kbps.MFRC522所实现的接口包括SPI,串行UART和I2C接口.

The MFRC522 is a highly integrated reader/writer for contactless communication at 13.56
MHz. The MFRC522 reader supports ISO 14443A / MIFARE® mode.
The MFRC522’s internal transmitter part is able to drive a reader/writer antenna designed
to communicate with ISO/IEC 14443A/MIFARE® cards and transponders without
additional active circuitry. The receiver part provides a robust and efficient implementation
of a demodulation and decoding circuitry for signals from ISO/IEC 14443A/MIFARE®
compatible cards and transponders. The digital part handles the complete
ISO/IEC 14443A framing and error detection (Parity & CRC).The MFRC522 supports
MIFARE®Classic (e.g. MIFARE® Standard) products. The MFRC522 supports contactless
communication using MIFARE® higher transfer speeds up to 848 kbit/s in both directions.

Various host interfaces are implemented:

SPI interface

serial UART (similar to RS232 with voltage levels according pad voltage supply)

I2C interface.

特性:

Highly integrated analog circuitry to demodulate and decode responses

Buffered output drivers to connect an antenna with minimum number of external
components

Supports ISO/IEC 14443A / MIFARE®

Typical operating distance in Reader/Writer mode for communication to aISO/IEC 14443A / MIFARE® up to 50 mm depending on the antenna size and tuning

Supports MIFARE® Classic encryption in Reader/Writer mode

Supports ISO/IEC 14443A higher transfer speed communication up to 848 kbit/s

Support of the MFIN / MFOUT

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

Supported host interfaces

SPI interface up to 10 Mbit/s

I2C interface up to 400 kbit/s in Fast mode, up to 3400 kbit/s in High-speed mode

serial UART in different transfer speeds up to 1228.8 kbit/s, framing according to
the RS232 interface with voltage levels according pad voltage supply

Comfortable 64 byte send and receive FIFO-buffer
Flexible interrupt modes
Hard reset with low power function
Power-down mode per software
Programmable timer
Internal oscillator to connect 27.12 MHz quartz
2.5 - 3.3 V power supply
CRC Co-processor
Free programmable I/O pins
Internal self test

Fig 1.简化的MFRC522 方框图

ig 2. MFRC522方框图

Fig 3 典型的应用电路图