SRIX4K
13.56MHz Short Range Contactless Memory Chip
With 4096 bit EEPROM, Anti-Collision and Anti-Clone Functions
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 Sub-carrier Frequency
106 Kbit/s Data Transfer
France Telecom Proprietary Anti-Clone
Function
8 bits Chip_ID based anticollision system
2 Count-Down Binary Counters
– 32 bits each
– 2
32
units to be counted-down
Antenna (
A3)
s
s
s
s
s
s
s
s
s
s
64-bit Unique Identifier
4096-bit EEPROM with Write Protect Feature
READ BLOCK & WRITE BLOCK (32 Bits)
Internal Tuning Capacitor
1million ERASE/WRITE Cycles
10-Year Data Retention
Self-Timed Programming Cycle
5ms Typical Programming Time
Antenna (
A4
)
Antenna (
A5)
Wafer
July 2003
Complete data available under NDA.
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SRIX4K
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
SRIX4K
Power
Supply
Regulator
4 Kbit
User
EEPROM
ASK
Demodulator
BPSK
Load
Modulator
AC1
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
AC1
AC0
Antenna Coil
Antenna Coil
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
s
s
s
s
s
s
s
s
WRITE_BLOCK
INITIATE
PCALL16
SLOT_MARKER
SELECT
COMPLETION
RESET_TO_INVENTORY
AUTHENTICATE
GET_UID
AC0
AI06829
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-
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.
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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
Figure 3. SRIX4K Memory Mapping
Block
Addr
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
...
127
Msb
b
31
32 bits Block
b
16
b
15
32 bits Boolean Area
32 bits Boolean Area
32 bits Boolean Area
32 bits Boolean Area
32 bits Boolean Area
32 bits binary counter
32 bits binary counter
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
Fixed Chip_ID
(Option)
EEPROM
Lockable EEPROM
Count down
Counter
Resettable OTP bits
Lsb
b
0
write access, they can be updated by the
WRITE_BLOCK command. A WRITE_BLOCK up-
dates all the 32 bits of the block.
b
24
b
23
b
8
b
7
Description
255
OTP_Lock_Reg
ST Reserved
System OTP bits
UID0
UID1
64 bits UID Area
ROM
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SRIX4K
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
SRIX4K
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
SRIX4K
–
W4
/ XXX
device, please contact your nearest ST Sales Of-
fice.
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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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