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SRI4K-W41GE Datasheet(PDF) 7 Page - STMicroelectronics

Part # SRI4K-W41GE
Description  13.56 MHz short-range contactless memory chip with 4096-bit EEPROM and anticollision functions
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SRI4K-W41GE Datasheet(HTML) 7 Page - STMicroelectronics

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SRI4K
Description
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1
Description
The SRI4K is a contactless memory, powered by an externally transmitted radio wave. It
contains a 4096-bit user EEPROM fabricated with STMicroelectronics CMOS technology.
The memory is organized as 128 blocks of 32 bits. The SRI4K 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 SRI4K and the reader is
106 kbit/s in both reception and emission modes.
The SRI4K follows the ISO 14443 part 2 type B recommendation for the radio-frequency
power and signal interface.
Figure 1.
Logic diagram
The SRI4K is specifically designed for short range applications that need re-usable
products. The SRI4K includes an anticollision mechanism that allows it to detect and select
tags present at the same time within range of the reader. The anticollision is based on a
probabilistic scanning method using slot markers. Using the STMicroelectronics single chip
coupler, CRX14, it is easy to design a reader and build a contactless system.
Table 1.
Signal names
Signal names
Description
AC1
Antenna coil
AC0
Antenna coil
AI10878
AC1
SRI4K
AC0
Power
Supply
Regulator
BPSK
Load
Modulator
ASK
Demodulator
4 Kbit
User
EEPROM


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