Introduction - If you have any usage issues, please Google them yourself
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.
Packet : 49636936t5557user.rar filelist
T5557user.pdf