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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 s s s s
Figure 1. Delivery Forms
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
s s s s s s s s
176-bit EEPROM with Write Protect Feature 64-bit Unique Identifier READ BLOCK & WRITE BLOCK (16 Bits) Internal Tuning Capacitor Self-Timed Programming Cycle 5ms Programming Time (typical) More than 100,000 Erase/Write Cycles More than 10 Year Data Retention
Antenna (A3)
Antenna (A4)
Antenna (A5)
Wafer
2003
Complete data available under NDA.
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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 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 13.56MHz 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 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 part 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 AC1
need a low cost and non-reusable product. The SR176 does not include any anti-collision mechanism, but does include a simple selection mechanism 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 AC0 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: s READ_BLOCK
s s s s s s
WRITE_BLOCK INITIATE SELECT COMPLETION PROTECT_BLOCK GET_PROTECTION.
AC0
AI04995
The SR176 is principally designed for short range applications, such as in object identification, that
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 (0000 b) by ST. When correctly set, up to sixteen SRIX4Ks can be selected individually.
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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 EEPROM user area in which the application can store Figure 3. SR176 Memory Mapping
Block Address 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 MSb b15 16-bit block b8 b7 UID0 UID1 UID2 UID3 User Area User Area User Area Lockable EEPROM User Area User Area Lockable EEPROM User Area User Area Lockable EEPROM User Area User Area Lockable EEPROM User Area User Area Lockable EEPROM OTP LOCK_REG Reserved Chip_ID
ai07699
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 status of the protection of blocks 4 to 15.
LSb b0
Description
64-bit UID ROM
Lockable EEPROM
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PART NUMBERING For a list of available options (speed, package, etc.) or for further information on any aspect of this Table 2. Ordering Information Scheme
Example: Device Type SR176 Package W4 =180 m 15 m Unsawn Wafer SBN18= 180m 15 m 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 SR176 - W4 / XXX
device, please contact your nearest ST Sales Office.
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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. The ST logo is registered trademark of STMicroelectronics All other names are the property of their respective owners (c) July 2003 STMicroelectronics - All Rights Reserved STMicroelectronics group of companies Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. www.st.com
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