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DATA BRIEFING
July 2003
Complete data available under NDA.
SRIX512
13.56MHz Short Range Contactless Memory Chip
With 512-bit EEPROM, Anti-Collision and Anti-Clone Functions
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 Sub-carrier Frequency
s
106 Kbit/s Data Transfer
s
France Telecom Proprietary Anti-Clone
Function
s
8 bits Chip_ID based anticollision system
s
2 Count-Down Binary Counters
32 bits each
2
32
units to be counted down
s
64-bit Unique Identifier
s
512-bit EEPROM with Write Protect Feature
s
READ BLOCK & WRITE BLOCK (32 Bits)
s
Internal Tuning Capacitor
s
1million ERASE/WRITE Cycles
s
10-Year Data Retention
s
Self-Timed Programming Cycle
s
5ms Typical Programming Time
Figure 1. Delivery Forms
Wafer
Antenna (
A3)
Antenna (
A4
)
Antenna (
A5)
SRIX512
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SUMMARY DESCRIPTION
The SRIX512 is a contactless memory, powered
by an externally transmitted radio wave. It contains
a 512-bit user EEPROM fabricated with STMicro-
electronics CMOS technology. The memory is or-
ganised as 16 blocks of 32 bits. The SRIX512 is
accessed via the 13.56MHz 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
847kHz sub-carrier. The received ASK wave is
10% modulated. The Data transfer rate between
the SRIX512 and the reader is 106Kbit/s in both
reception and emission modes.
The SRIX512 follows the ISO 14443 part 2 type B
recommendation for the radio-frequency power
and signal interface.
Figure 2. Logic Diagram
The SRIX512 targets short range applications
which need secure and re-usable products. The
SRIX512 includes an anti-collision mechanism
that allows it to detect and select tags present at
the same time within range of the reader. The anti-
collision is based on a probabilistic scanning meth-
od using slot markers. The SRIX512 provides an
anti-clone function which allows its authentication.
Using the STMicroelectronics single chip coupler,
CRX14, it is easy to design a reader with the au-
thentication capability and to build a system with a
high level of security.
Table 1. Signal Names
The SRIX512 contactless EEPROM can be ran-
domly read and written in block mode. Each block
is composed of 32 bits. It offers a set of 10 com-
mands:
s
READ_BLOCK
s
WRITE_BLOCK
s
INITIATE
s
PCALL16
s
SLOT_MARKER
s
SELECT
s
COMPLETION
s
RESET_TO_INVENTORY
s
AUTHENTICATE
s
GET_UID
The SRIX512 memory array is divided in three, as
described in Figure 3. The first area is a resettable
OTP (one time programmable) area in which bits
can only be switched from 1 to 0. Using a special
command, it is possible to erase all the bits of this
area to 1. The second area provides two 32-bit bi-
nary counters that can only be decremented from
FFFFFFFFh to 00000000h, and gives a capacity
of 4,294,967,296 units per counter. The last area
is the EEPROM area. It is accessible in blocks of
32 bits, and automatically invokes an auto-erase
cycle during each WRITE_BLOCK command.
AI08560
AC1
SRIX512
AC0
Power
Supply
Regulator
BPSK
Load
Modulator
ASK
Demodulator
512-bit
User
EEPROM
AC1
Antenna Coil
AC0
Antenna Coil
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SRIX512
MEMORY MAPPING
The SRIX512 is organised as 16 blocks of 32 bits
as shown in Figure 3. All blocks are accessible by
the READ_BLOCK command. Depending on the
write access, they can be updated by the
WRITE_BLOCK command. A WRITE_BLOCK up-
dates all the 32 bits of the block.
Figure 3. SRIX512 Memory Mapping
Block
Addr
Msb
32 bits Block
Lsb
b
31
b
24
b
23
b
16
b
15
b
8
b
7
b
0
Description
0
32-bit Boolean Area
Resettable OTP bits
1
32-bit Boolean Area
2
32-bit Boolean Area
3
32-bit Boolean Area
4
32-bit Boolean Area
5
32-bit Binary Counter
Count down
Counter
6
32-bit Binary Counter
7
User Area
Lockable EEPROM
8
User Area
9
User Area
10
User Area
11
User Area
12
User Area
13
User Area
14
User Area
15
User Area
255
OTP_Lock_Reg
ST Reserved
Fixed Chip_ID
(Option)
System OTP bits
UID0
64-bit UID Area
ROM
UID1
SRIX512
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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:
SRIX512
W4
/ XXX
Device Type
SRIX512
Package
W4 =180
m 15
m unsawn wafer
SBN18= 180m 15 m Bumped & sawn wafer on 8inches 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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SRIX512
REVISION HISTORY
Table 3. Document Revision History
Date
Version
Revision Details
11-Jul-2003
1.0
First Issue
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