Summary description
   The SRI512 is a contactless memory, powered by an externally transmitted radio wave. It contains a 512-bit user EEPROM fabricated with STMicroelectronics CMOS technology. The memory is organized as 16 blocks of 32 bits. The SRI512 is accessed via the 13.56MHz carrier. Incoming data are demodulated and decoded from the received Amplitude Shift Keying (ASK) modulation signal and outgoing data are generated by load variation using Bit Phase Shift Keying (BPSK) coding of a 847kHz sub-carrier. The received ASK wave is 10% modulated. The Data transfer rate between the SRI512 and the reader is 106kbit/s in both reception and emission modes.

FEATUREs
◾ ISO 14443 - 2 Type B Air Interface Compliant
◾ ISO 14443 - 3 Type B Frame Format Compliant
◾ 13.56MHz Carrier Frequency
◾ 847kHz Sub-carrier Frequency
◾ 106 kbit/second Data Transfer
◾ 8-bit Chip_ID based anticollision system
◾ 2 Count-Down Binary Counters with automated
   Anti-tearing protection
◾ 64-bit Unique Identifier
◾ 512-bit EEPROM with Write Protect feature
◾ Read Block and Write Block (32 bits)
◾ Internal Tuning Capacitor
◾ 1million Erase/Write Cycles
◾ 40-Year Data Retention
◾ Self-Timed Programming Cycle
◾ 5ms Typical Programming Time