SGS Thomson Microelectronics SR176 Datasheet
13.56 MHz Short Range Contactless Memory Chip
176 bit USER EEPROM and 64-bit Unique ID
FEATURES SUMMARY
■ ISO 14443 - 2 Type B Air Interface Compliant
■ ISO 14443 - 3 Type B Frame Format Compliant
■ 13.56MHz Carrier Frequency
■ 847kHz Subcarrier Frequency
■ 106kbit/s Data Transfer
■ Data Transfer
– ASK Modulation from Reader to Tag
– BPSK Coding from Tag to Reader
■ 176-bit EEPROM with Write Protect Feature
■ 64-bit Unique Identifier
■ READ BLOCK & WRITE BLOCK (16 Bit s )
■ Internal Tuning Capacitor
■ Self-Tim e d P rogramming Cycle
■ 5ms Programming Time (typical)
■ More than 100,000 Erase/Write Cycles
■ More than 10 Year Data Retention
Figure 1. Delivery Forms
Antenna (
Antenna (A4)
SR176
DATA BRIEFING
A3)
2003
Complete data available under NDA.
Antenna (A5)
Wafer
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SR176
SUMMARY DESCRIPTION
The SR176 is a contactless memory, powered by
an externally transm itted radio wave. It contains
176 bits of user EEPROM, fabricated with STMicroelectronics CMOS technology. The memo ry is
organized as 16 blocks of 16 bits, of which 11
blocks are user accessible.
The SR176 is accessed via the 13.56MHz carrier.
Incoming data are demodulated and decoded
from the received Amplitude Shift Keying modulation signal (ASK). The modula tion index of t his signal is 10%. Outgo ing data are generated by load
variation using Bit Phase Shift Keying (BPSK) of a
847kHz subcarrier. The Data transfer rate between the SR176 and the reader is 106kbit/s in
both reception and emission modes.
The SR176 follows the ISO 14443 pa rt 2 type B
recommendation for radio frequency power and
signal interface.
Figure 2. Logic Diagram
SR176
Power
Supply
Regulator
176 bit
User
EEPROM
ASK
Demodulator
BPSK
Load
Modulator
The SR176 is principally desi gned for s hort range
applications, such as in object identification, that
AC1
AC0
AI04995
need a low cost and non-reusable product. The
SR176 does not include any ant i-collis ion mec hanism, but does include a simple selection mechanism to cope with cases where more than one tag
is present, within the range of the Rea der, at the
any one time.
Table 1. Signal Names
AC1 Antenna Coil
AC0 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.
The SR176 is divided into two major areas: the
unique identifier (UID) and the User EEPROM.
The UID is a 64 -bit uniq ue identifier written by ST
during product manufacturing. The User EEPROM
is divided into areas which c an be write-protected
so that they behave as ROM. The write protection
is activated using an OTP lo ck bits register. It is
possible to program the SR176 4-bit chip_ID used
by the SELECT command. Its default value is fixed
at the value 0 (0000
) by ST. When correctly s et,
b
up to sixteen SRIX4Ks can be selected individually.
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