srt512 STMicroelectronics, srt512 Datasheet - Page 7

• Manufacturer Part Number: srt512
• Description: 13.56 Mhz Short-range Contactless Memory Chip With 512-bit Eeprom And Anticollision Functions
• Manufacturer: STMicroelectronics

SRT512
1
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.
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.
AC1
AC0
Logic diagram
Signal names
EEPROM
512-bit
User
Antenna coil
Antenna coil
Demodulator
Modulator
Regulator
Supply
Power
BPSK
Load
ASK
AI13502
AC0
AC1
Description
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