IZ1991

IZ1991 CIRCUIT OF MULTIFUNCTIONAL ELECTRONIC KEY WITH DATA PROTECTION (functional equvivalent DS1991 «Maxim-Dallas Semiconductor») IZ1991 – circuit of multifunctional electronic key with data protection is perposed for autonomos identification in systems of access control, registration and identification of object. Circuit performs following functions: One-time data writing in to ROM; Data storage and reading out of ROM; CRC-code (Cyclic Redundancy Check) generation ; Data transfer via 1-wire interface; Data and password storage for three independent keys. Main features: 1152-bit secure memory with read/write possibility; Secure memory can be decoded only on matching 64-bit password Memory is partitioned into 3 blocks of 384 bits each 64-bit password and ID fields for each memory block 512-bit scratchpad ensures data transfer integrity Supply voltage (battery supply), UDD, from 2,7 to 3,3 V Operating temperature range from - 40 to +85°С Table 1 - Contact pad description Contact pad num- ber Symbol Function 01 TEST1 Test pad 02 TEST2 Test pad 03 GND Common pin 04 DATA Data I/O 05 UDD Supply voltage 06 TEST3 Test pad 07 TEST4 Test pad 08 TEST5 Test pad 09 TEST6 Test pad 10 TEST7 Test pad 11 TEST8 Test pad 12 TEST9 Test pad 13 TEST10 Test pad Note – Contact pads TEST1 – TEST10 are purposed for testing and not used by customer Ver.01/01.10.2009 1 IZ1991 DATA 1-Wire interface unit Scratchpad memory 512 bit ...