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SR176-SBN18 Datasheet(PDF) 2 Page - STMicroelectronics |
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SR176-SBN18 Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 5 page SR176 2/5 SUMMARY DESCRIPTION The SR176 is a contactless memory, powered by an externally transmitted radio wave. It contains 176 bits of user EEPROM, fabricated with STMi- croelectronics CMOS technology. The memory is organized as 16 blocks of 16 bits, of which 11 blocks are user accessible. The SR176 is accessed via the 13.56MHz carrier. Incoming data are demodulated and decoded from the received Amplitude Shift Keying modula- tion signal (ASK). The modulation index of this sig- nal is 10%. Outgoing data are generated by load variation using Bit Phase Shift Keying (BPSK) of a 847kHz subcarrier. The Data transfer rate be- tween the SR176 and the reader is 106kbit/s in both reception and emission modes. The SR176 follows the ISO 14443 part 2 type B recommendation for radio frequency power and signal interface. Figure 2. Logic Diagram The SR176 is principally designed for short range applications, such as in object identification, that need a low cost and non-reusable product. The SR176 does not include any anti-collision mecha- nism, but does include a simple selection mecha- nism to cope with cases where more than one tag is present, within the range of the Reader, at the any one time. Table 1. Signal Names The SR176 contactless EEPROM offers read and write random access in block mode. One block is composed by 16 bits. The device has an instruc- tion set containing seven commands: s READ_BLOCK s WRITE_BLOCK s INITIATE s SELECT s COMPLETION s PROTECT_BLOCK s GET_PROTECTION. The SR176 is divided into two major areas: the unique identifier (UID) and the User EEPROM. The UID is a 64-bit unique identifier written by ST during product manufacturing. The User EEPROM is divided into areas which can be write-protected so that they behave as ROM. The write protection is activated using an OTP lock bits register. It is possible to program the SR176 4-bit chip_ID used by the SELECT command. Its default value is fixed at the value 0 (0000b) by ST. When correctly set, up to sixteen SRIX4Ks can be selected individual- ly. AI04995 AC1 SR176 AC0 Power Supply Regulator BPSK Load Modulator ASK Demodulator 176 bit User EEPROM AC1 Antenna Coil AC0 Antenna Coil |
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