1/4 data briefing june 2002 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 n iso 14443 - 2 type b air interface compliant n iso 14443 - 3 type b frame format compliant n 13.56mhz carrier frequency n 847khz sub-carrier frequency n 106 kbit/s data transfer n france telecom proprietary anti-clone function n 8 bits chip_id based anticollision system n 2 count-down binary counters C 32 bits each C2 32 units to be counted-down n 64-bit unique identifier n 4096-bit eeprom with write protect feature n read block & write block (32 bits) n internal tuning capacitor n 1million erase/write cycles n 10-year data retention n self-timed programming cycle n 5ms typical programming time figure 1. delivery forms wafer antenna ( a3t/s-isor) antenna ( a4t/15r )
SRIX4K 2/4 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 disposable or 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 read- er. the anti-collision is based on a probabilistic scanning methodology using slot markers. the SRIX4K provides an anti-clone function which al- lows its authentication. using the stmicroelec- tronics 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 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: n read_block n write_block n initiate n pcall16 n slot_marker n select n completion n reset_to_inventory n authenticate n get_uid the SRIX4K memory is organized in three areas, as described in figure 3. the first area is a reset- table eprom in which bits can only switch 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 ffffffffh 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. ai06829 ac1 SRIX4K ac0 power supply regulator bpsk load modulator ask demodulator 4 kbit user eeprom ac1 antenna coil ac0 antenna coil
3/4 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 eprom 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 eprom uid0 64 bits uid area rom uid1
SRIX4K 4/4 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 Cw4/xxx device type SRIX4K package w4 =180 m m 15 m m unsawn wafer a3t/s-isor = half iso copper antenna on tape a4t/15r = 15mm x 15mm copper antenna on tape customer code xxx = given by the issuer information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nsequences 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 publicati on are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics prod ucts are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectro nics. the st logo is registered trademark of stmicroelectronics all other names are the property of their respective owners ? 2002 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 - unit ed states. www.st.com
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