SGS Thomson Microelectronics SRIX4K Datasheet
SRIX4K
13.56MHz Short Range Contactless Memory Chip
With 4096 bit EEPROM, Anti-Collision and Anti-Clone Functions
DATA BRIEFING
FEATURES SUMMARY
■ ISO 14443 - 2 Type B Air Interface Compliant
■ 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 b i ts each
32
units to be counted-down
–2
■ 64-bit Unique Identifier
■ 4096-bit EEPROM with Write Protect Feature
■ READ BLOCK & WRITE BLOCK (3 2 Bits)
■ Internal Tuning Capacitor
■ 1million ERASE/WRITE Cycles
■ 10-Year Data Retention
■ Self-Tim e d P rogramming Cycle
■ 5ms Typical Programming Time
Figure 1. Delivery Forms
Antenna (
Antenna (A4)
A3)
July 2003
Complete data available under NDA.
Antenna (A5)
Wafer
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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 STMicroelectronics CMOS techn ology. T he memory is organised as 128 blocks of 32 bits. The SR IX4K is
accessed via the 13.56MHz carrier. Incoming data
are demodulated and d ecoded from t he received
Amplitude Shift Keying (ASK) modulation signal
and outgoing data are generated by load variation
using Bit Phase Shift Keying (B PSK) coding of a
847kHz sub-carrier. The received ASK wave is
10% modulated. The Data transfer rate bet ween
the SRIX4K and the reader is 106Kbit/s in both reception and emission modes.
The SRIX4K follows t he ISO 14443 part 2 t ype 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
The SRIX4K targets short range applications
which need secure an d 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-collision is based on a probabilistic scanning method
using slot markers. The SRIX4K prov id es an ant i-
AC1
AC0
AI06829
clone function which allows its authentication. Using the STMicroelectronics single chip coupler,
CRX14, it is easy to design a reader with the authentication capability and to build a system with a
high level of security.
Table 1. Signal Names
AC1 Antenna Coil
AC0 Antenna Coil
The SRIX4K contactless EEPROM can be randomly read and write in block mode. Each block is
composed by 32 bits. It offers a set of 10 commands:
■ READ_BLOCK
■ WRITE_BLOCK
■ INITIATE
■ PCALL16
■ SLOT_MARKER
■ SELECT
■ COMPLETION
■ RESET_TO_INVENTORY
■ AUTHENTICATE
■ GET_UID
The SRIX4K memory is organized in three areas,
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 bits of this
area to 1. The second area provides two 32-bit binary counters which can only be decremented
from FFFFFFFF h to 00000000h, and gives a capacity 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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