SRIX4K 데이터 시트보기 (PDF) - STMicroelectronics
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SRIX4K Datasheet PDF : 47 Pages
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SRIX4K
1
Description
Description
The SRIX4K 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 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.
Figure 1. Logic diagram
SRIX4K
4 Kbit
User
EEPROM
Power
Supply
Regulator
ASK
Demodulator
BPSK
Load
Modulator
AC1
AC0
AI06829
The SRIX4K is specifically designed for short range applications that need secure and re-
usable products. The SRIX4K 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. The SRIX4K provides an anti-
clone function which allows its authentication. Using the STMicroelectronics single chip
coupler, CRX14, it is easy to design a reader with the authentication capability and to build a
system with a high level of security.
Table 1. Signal names
Signal name
AC1
AC0
Antenna coil
Antenna coil
Description
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