SRIX4K Chips: The SRIX4K is a contactless memory, powered by an externally transmitted radio wave. It contains a 4096-bit user EEPROM. The memory is organized as 128 blocks of 32 bits. The SRIX4K is accessed via the 13.56 MHz 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 847 kHz subcarrier. The received ASK wave is 10% modulated. The data transfer rate between the SRIX4K and the reader is 106 Kbit/s in both reception and emission modes. The SRIX4K follows the ISO 14443-2 Type B recommendation for the radio-frequency power and signal interface. 13.56 MHz short-range contactless memory chip with 4096-bit EEPROM, anticollision and anti-clone functions Features ■ ISO 14443-2 Type B air interface compliant ■ ISO 14443-3 Type B frame format compliant ■ 13.56 MHz carrier frequency ■ 847 kHz subcarrier frequency ■ 106 Kbit/second data transfer ■ France Telecom proprietary anti-clone function ■ 8 bit Chip_ID based anticollision system ■ 2 count-down binary counters with automated antitearing protection ■ 64-bit unique identifier ■ 4096-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 ■ 5 ms typical programming time

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