SRI2K datasheet(7/45 Pages) STMICROELECTRONICS

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SRI2K

Description

Doc ID 15779 Rev 3

7/45

Description

The SRI2K is a contactless memory, powered by an externally transmitted radio wave. It

contains a 2048-bit user EEPROM. The memory is organized as 64 blocks of 32 bits. The

SRI2K 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

SRI2K and the reader is 106 kbit/s in both reception and emission modes.

The SRI2K follows the ISO 14443 part 2 type B recommendation for the radio-frequency

power and signal interface.

Figure 1.

Logic diagram

The SRI2K is specifically designed for short range applications that need re-usable

products. The SRI2K 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

AI15575

AC1

SRI2K

AC0

Power

Supply

Regulator

BPSK

Load

Modulator

ASK

Demodulator

2 Kbit

User

EEPROM

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