1.2 ATA5577M1-PP Transponder Operation

The read/write IDIC® ATA5577M1330C is part of the transponder ATA5577M1330C-PPMY. Data is transmitted bi-directionally between the base station and the transponder. The transponder receives power via a single coil from the RF signal generated by the base station. The single coil is connected to the chip and also serves as the IC’s bi-directional communication interface.

Data is transmitted by modulating the amplitude of the RF signal. The register contents are read by damping the coil voltage using an internal load. Writing into registers occurs by interrupting the RF field in a specific way. The ATA5577M1330C-PP transponder operates at a nominal frequency of 125 kHz. There are varying bit rates and encoding schemes. The on-chip 363-bit EEPROM (11 blocks with 33 bits each) can be read and written block-wise from a base station (reader). The blocks can be protected against overwriting by using lock bits. Two blocks contain production information and form a unique ID numbering system. Another block may contain a password to prevent unauthorized writing. Two blocks are reserved for setting the IC's operating modes. For more detailed information about ATA5577M1330C operating modes, refer to the ATA5577C – Read/Write LF RFID IDIC 100 kHz to 150 kHz Datasheet (DS70005357B).