MF RC522 是应用于13.56MHz 非接触式通信中高集成度读写卡系列芯片中的一员。是NXP公司针对“三表”应用
推出的一款低 电压、低成本、体积小的非接触式读写卡芯片，是智能仪表和便携 式手持设备研发的较好选择。
MF RC522 利用了先进的调制和解调概念，完全集成了在13.56MHz 下所有类型的被动非接触式通信方式和协议。支持 ISO14443A 的多层应用。其内部发送器部分可驱动读写器天线与ISO 14443A/MIFARE卡和应答机的通信，无需其它的电路。接收器部分提供一个坚固而有效的解调和解码电路，用于处理ISO14443A 兼容的应答器信号。数字部分处理ISO14443A 帧和错误检测（奇偶 &CRC）。此外，它还支持快速CRYPTO1加密算法，用于验证MIFARE 系列产品。MFRC522 支持MIFARE?更高速的非接触式通信，双向数据传输速率高达424kbit/s。
作为13.56MHz 高集成度读写卡系列芯片家族的新成员，MF RC522 与MF RC500和 MF RC530 有不少相似之处，同时也具备诸多特点和差异。它与主机间的通信采用连线较少的串行通信，且可根据不同的用户需求，选取SPI、I2C 或串行UART(类似RS232)模式之一，有利于减少连线，缩小PCB 板体积，降低成本。
Features ◆ High integration modem circuit;
◆ A small number of external devices can be used to connect the output driver stage to the antenna;
◆Support ISO/IEC 14443 TypeA and MIFARE communication protocols®;
◆ Communication distance with ISO 14443A/MIFARE® in reader mode up to 50mm, depending on antenna length and tuning.
◆ Supports communication with higher transmission rates of ISO 14443 212kbit/s and 424kbit/s.
◆Support MIFARE® Classic encryption;
◆Supported Host Interfaces:
-10Mbit/s SPI interface
-I2C interface, the rate is 400 kbit/s in fast mode and 3400 kbit/s in high-speed mode
-Serial UART, transmission rate up to 1228.8 kbit/s, frame dependent on RS232 interface, voltage level depends on the pin voltage supplied
◆ 64-byte send and receive FIFO buffer;
◆Flexible interrupt mode;
◆ Programmable timer.
◆There are three power-saving modes: hardware power down, software power down and transmitter power down, the first two modes are the same as MFRC500 and CL RC400, and its unique "transmitter power down" can turn off the internal antenna driver, that is, turn off the RF field;
◆Built-in temperature sensor to automatically stop RF emission when the chip temperature is too high;
◆ Use multiple independent power supplies to avoid mutual interference between modules and improve the stability of work;
◆With CRC and parity functions, the 16-bit long CRC calculation polynomial of the CRC coprocessor is fixed as: x16+x12+x5+1, in accordance with ISO/1EC14443 and CCTITT protocol;
◆Internal oscillator, connected to 27.12MHz crystal;
◆2.5~3.3V low voltage and low power consumption design;
◆Operating temperature range -30~+85°C;
◆Ultra-small volume of 5mm×5mm×0.85mm.
Edit this section Applications The MF RC522 is suitable for a wide range of applications based on the ISO/IEC 14443A standard that require low-cost, small size, high performance, and contactless communication from a single power supply.
▲Three tables;
▲ Board unit;
▲Public transportation terminals;
▲Portable handheld device;
▲Contactless public telephone. //www.chip100.com/