SRT512 datasheet(7/46 Pages) STMICROELECTRONICS

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SRT512

Description

Doc ID 13277 Rev 4

7/46

Description

The SRT512 is a contactless memory, powered by an externally transmitted radio wave. It

contains a 512-bit user EEPROM fabricated with STMicroelectronics CMOS technology.

The memory is organized as 16 blocks of 32 bits. The SRT512 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 SRT512 and the reader is

106 Kbit/s in both reception and emission modes.

The SRT512 follows the ISO 14443-2 Type B recommendation for the radio-frequency

power and signal interface.

Figure 1.

Logic diagram

The SRT512 is specifically designed for short range applications that need re-usable

products. The SRT512 includes an anticollision mechanism that allows it to detect and

select tags present at the same time within range of the reader.

Table 1.

Signal names

Signal name

Description

AC1

Antenna coil

AC0

Antenna coil

AI13502

AC1

AC0

Power

Supply

Regulator

BPSK

Load

Modulator

ASK

Demodulator

512-bit

User

EEPROM

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