sri512 STMicroelectronics, sri512 Datasheet - Page 7

• Manufacturer Part Number: sri512
• Description: 13.56-mhz Short-range Contactless Memory Chip With 512-bit Eeprom And Anti-collision Functions
• Manufacturer: STMicroelectronics

SRI512
1
Description
The SRI512 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 SRI512 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 SRI512 and the reader is
106 Kbit/s in both reception and emission modes.
The SRI512 follows the ISO 14443-2 Type B recommendation for the radio-frequency power
and signal interface.
Figure 1.
The SRI512 is specifically designed for short range applications that need re-usable
products. The SRI512 includes an anticollision mechanism that allows it to detect and select
tags present at the same time within range of the reader. Using the STMicroelectronics
single chip coupler, CRX14, it is easy to design a reader and build a contactless system.
Table 1.
AC1
AC0
Logic diagram
Signal names
EEPROM
512-bit
User
Antenna Coil
Antenna Coil
SRI512
Demodulator
Modulator
Regulator
Supply
Power
BPSK
Load
ASK
AI10795
AC0
AC1
Description
7/50