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DATA BRIEFING
July 2003
Complete data available under NDA.
SRIX4K
13.56MHz Short Range Contactless Memory Chip
With 4096 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
4096-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)
SRIX4K
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SUMMARY DESCRIPTION
The SRIX4K is a contactless memory, powered by
an externally transmitted radio wave. It contains a
4096-bit user EEPROM fabricated with STMicro-
electronics CMOS technology. The memory is or-
ganised as 128 blocks of 32 bits. The SRIX4K 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 SRIX4K and the reader is 106Kbit/s in both re-
ception and emission modes.
The SRIX4K follows the ISO 14443 part 2 type B
recommendation for the radio-frequency power
and signal interface.
Figure 2. Logic Diagram
The SRIX4K targets short range applications
which need secure and re-usable products. The
SRIX4K 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-col-
lision is based on a probabilistic scanning method
using slot markers. The SRIX4K provides an anti-
clone function which allows its authentication. Us-
ing 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 SRIX4K contactless EEPROM can be ran-
domly read and write in block mode. Each block is
composed by 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 SRIX4K memory is organized in three areas,
as described in Figure 3. The first area is a reset-
table OTP (one time programmable) area in which
bits can only be switched from 1 to 0. Using a spe-
cial command, it is possible to erase all bits of this
area to 1. The second area provides two 32-bit bi-
nary counters which can only be decremented
from FFFFFFFFh to 00000000h, and gives a ca-
pacity of 4,294,967,296 units per counter. The last
area is the EEPROM memory. It is accessible by
block of 32 bits and includes an auto-erase cycle
during each WRITE_BLOCK command.
AI06829
AC1
SRIX4K
AC0
Power
Supply
Regulator
BPSK
Load
Modulator
ASK
Demodulator
4 Kbit
User
EEPROM
AC1
Antenna Coil
AC0
Antenna Coil
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SRIX4K
MEMORY MAPPING
The SRIX4K is organised as 128 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. SRIX4K 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 bits Boolean Area
Resettable OTP bits
1
32 bits Boolean Area
2
32 bits Boolean Area
3
32 bits Boolean Area
4
32 bits Boolean Area
5
32 bits binary counter
Count down
Counter
6
32 bits 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
16
User Area
EEPROM
...
User Area
127
User Area
255
OTP_Lock_Reg
ST Reserved
Fixed Chip_ID
(Option)
System OTP bits
UID0
64 bits UID Area
ROM
UID1
SRIX4K
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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:
SRIX4K
W4
/ XXX
Device Type
SRIX4K
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
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SRIX4K
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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