SRIX4K datasheet(7/50 Pages) STMICROELECTRONICS

7 / 50 page

SRIX4K

Description

7/50

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

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

AC1

Antenna coil

AC0

Antenna coil

AI06829

AC1

SRIX4K

AC0

Power

Supply

Regulator

BPSK

Load

Modulator

ASK

Demodulator

4 Kbit

User

EEPROM

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