SRI4K datasheet(7/45 Pages) STMICROELECTRONICS

7 / 45 page

SRI4K

Description

7/45

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

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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