Introduction

The ATA5577M1330C-PPMY is a contactless read/write identification transponder (IDIC®) for applications in the 125 kHz frequency band. It consists of a plastic brick that accommodates the read/write IDIC ATA5577M1330C. The antenna comprises an inductor which, in combination with the on-chip capacitor, serves as a power supply and bi-directional communication interface.

The on-chip 363-bit EEPROM (11 blocks with 33 bits each) can be read and written block-wise from a base station (reader). Two dedicated blocks are reserved for setting the IDIC Operating Modes. Another block may be used for a password to prevent unauthorized writing.

Data is transmitted from the IDIC (uplink) using load modulation. This is achieved by damping the Radio Frequency (RF) field with a resistive load. The IC receives and decodes serial base station commands (downlink) which are encoded as 100% amplitude-modulated (OOK) pulse-interval-encoded bit streams.