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SRI512-W41GE Datasheet(PDF) 7 Page - STMicroelectronics

Part # SRI512-W41GE
Description  13.56 MHz short-range contactless memory chip with 512-bit EEPROM and anticollision functions
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SRI512-W41GE Datasheet(HTML) 7 Page - STMicroelectronics

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SRI512
Description
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1
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
13.56 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 SRI512 and the reader is
106 Kbit/s in both reception and emission modes.
The SRI512 follows the ISO 14443-2 Type B recommendation for the radio-frequency power
and signal interface.
Figure 1.
Logic diagram
The SRI512 is specifically designed for short range applications that need re-usable
products. The SRI512 includes an anticollision mechanism that allows it to detect and select
tags present at the same time within range of the reader. Using the STMicroelectronics
single chip coupler, CRX14, it is easy to design a reader and build a contactless system.
Table 1.
Signal names
Signal name
Description
AC1
Antenna coil
AC0
Antenna coil
AI10795
AC1
SRI512
AC0
Power
Supply
Regulator
BPSK
Load
Modulator
ASK
Demodulator
512-bit
User
EEPROM


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