说明：  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。
(RC522 is a member of the high integration read and write card chip used in 13.56MHz contactless communication. NXP is a low-voltage, low-cost, small-size non-contact read-write card chip for the "three meters" application. It is a good choice for the development of intelligent instruments and portable handheld devices.)