SR176_07 Datasheet, PDF (6/35 Pages) STMicroelectronics – 13.56 MHz, 176-bit short range contactless user EEPROM with 64-bit Unique ID

Description
1
Description
SR176
The SR176 is a contactless memory, powered by an externally transmitted radio wave. It
contains 176 bits of user EEPROM, fabricated with STMicroelectronics CMOS technology.
The memory is organized as 16 blocks of 16 bits, of which 11 blocks are user accessible.
The SR176 is accessed via the 13.56 MHz carrier. Incoming data are demodulated and
decoded from the received Amplitude Shift Keying modulation signal (ASK). The modulation
index of this signal is 10%. Outgoing data are generated by load variation using Bit Phase
Shift Keying (BPSK) of a 847.5 kHz subcarrier. The Data transfer rate between the SR176
and the reader is 106 Kbit/s in both reception and emission modes.
The SR176 follows the ISO 14443-2 Type B recommendation for radio frequency power and
signal interfacing.
Figure 1. Pad connections
SR176
176 bit
USER
EEPROM
Power
Supply
Regulator
ASK
Demodulator
BPSK
Load
Modulator
AC1
AC0
AI09057
The SR176 is principally designed for short range applications, such as object identification,
that need a low cost and non-reusable tag. The SR176 does not include any anticollision
mechanism. It provides an “addressed” selection mechanism to cope with cases where
more than one tag is present within the range of the reader.
Table 1.
AC1
AC0
Signal names
Antenna coil
Antenna coil
The SR176 contactless EEPROM offers read and write random access in block mode. One
block is composed by 16 bits. The device has an instruction set containing seven
commands:
● READ_BLOCK
● WRITE_BLOCK
● INITIATE
● SELECT
● COMPLETION
● PROTECT_BLOCK
● GET_PROTECTION.
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