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SR176
13.56 MHz Short Range Contactless Memory Chip
176 bit USER EEPROM and 64-bit Unique ID
DATA BRIEFING
FEATURES SUMMARY
s ISO 14443 - 2 Type B Air Interface Compliant
s ISO 14443 - 3 Type B Frame Format Compliant
s 13.56MHz Carrier Frequency
s 847kHz Subcarrier Frequency
s 106kbit/s Data Transfer
s Data Transfer
– ASK Modulation from Reader to Tag
– BPSK Coding from Tag to Reader
s 176-bit EEPROM with Write Protect Feature
s 64-bit Unique Identifier
s READ BLOCK & WRITE BLOCK (16 Bits)
s Internal Tuning Capacitor
s Self-Timed Programming Cycle
s 5ms Programming Time (typical)
s More than 100,000 Erase/Write Cycles
s More than 10 Year Data Retention
Figure 1. Delivery Forms
Antenna (A3)
Antenna (A4)
Antenna (A5)
2003
Complete data available under NDA.
Wafer
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SR176
SUMMARY DESCRIPTION
The SR176 is a contactless memory, powered by
an externally transmitted radio wave. It contains
176 bits of user EEPROM, fabricated with STMi-
croelectronics 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 13.56MHz carrier.
Incoming data are demodulated and decoded
from the received Amplitude Shift Keying modula-
tion signal (ASK). The modulation index of this sig-
nal is 10%. Outgoing data are generated by load
variation using Bit Phase Shift Keying (BPSK) of a
847kHz subcarrier. The Data transfer rate be-
tween the SR176 and the reader is 106kbit/s in
both reception and emission modes.
The SR176 follows the ISO 14443 part 2 type B
recommendation for radio frequency power and
signal interface.
Figure 2. Logic Diagram
SR176
176 bit
User
EEPROM
Power
Supply
Regulator
ASK
Demodulator
BPSK
Load
Modulator
AC1
AC0
AI04995
The SR176 is principally designed for short range
applications, such as in object identification, that
need a low cost and non-reusable product. The
SR176 does not include any anti-collision mecha-
nism, but does include a simple selection mecha-
nism to cope with cases where more than one tag
is present, within the range of the Reader, 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 instruc-
tion set containing seven commands:
s READ_BLOCK
s WRITE_BLOCK
s INITIATE
s SELECT
s COMPLETION
s PROTECT_BLOCK
s GET_PROTECTION.
The SR176 is divided into two major areas: the
unique identifier (UID) and the User EEPROM.
The UID is a 64-bit unique identifier written by ST
during product manufacturing. The User EEPROM
is divided into areas which can be write-protected
so that they behave as ROM. The write protection
is activated using an OTP lock 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 (0000b) by ST. When correctly set,
up to sixteen SRIX4Ks can be selected individual-
ly.
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SR176
MEMORY MAPPING
The SR176 is organized as 16 blocks of 16 bits, as
shown in Figure 3.
The first four blocks, from location 0 to 3, are used
to store read-only data. They store the 64-bit UID.
This value cannot be modified.
Blocks from locations 4 to 14 offer a 176-bit EE-
PROM user area in which the application can store
its data values. Block 15 contains the OTP
LOCK_REG and the programmed Chip_ID.
The PROTECT_BLOCK command is used to lock
write access to blocks 4 to 15 by a group of 2
blocks.
The GET_PROTECTION command gives the sta-
tus of the protection of blocks 4 to 15.
Figure 3. SR176 Memory Mapping
Block MSb
Address b15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16-bit block
b8 b7
UID0
UID1
UID2
UID3
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
OTP LOCK_REG
LSb
Description
b0
64-bit UID
ROM
Lockable EEPROM
Lockable EEPROM
Lockable EEPROM
Lockable EEPROM
Lockable EEPROM
Reserved Chip_ID
Lockable EEPROM
ai07699
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SR176
PART NUMBERING
For a list of available options (speed, package,
etc.) or for further information on any aspect of this
device, please contact your nearest ST Sales Of-
fice.
Table 2. Ordering Information Scheme
Example:
SR176
W4 / XXX
Device Type
SR176
Package
W4 =180 µm ± 15 µm Unsawn Wafer
SBN18= 180µm ± 15 µm Bumped and Sawn Wafer on 8-inch Frame
A3T= 38mm x 38mm Copper Antenna on Continuous Tape
A3S= 38mm x 38mm Copper Singulated Adhesive Antenna on Tape
A4T= 15mm x 15mm Copper Antenna on Continuous Tape
A4S= 15mm x 15mm Copper Singulated Adhesive Antenna on Tape
A5T= 42mm x 65mm Copper Antenna on Continuous Tape
A5S= 42mm x 65mm Copper Singulated Adhesive Antenna on Tape
Customer Code
XXX = Given by STMicroelectronics
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SR176
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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