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T5557是兼容e555x的RFID芯片,但又具备和e555x系列芯片不同的新性能。文章着重介绍了T5557的新特点及工作原理,并对其RSK工作模式下读写器的电路设计作了分析,最后给出了D类功放和FSK解调的应用电路。-T5557 is compatible e555x the RFID chip, but with different chips and e555x series of new features. T5557 article highlights the new features and working principle and its mode RSK reader an analysis of the circuit design, and finally give the Class D amplifier and the FSK demodulator circuit applications.