4428 chip card key indicators and functional parameters

Key Indicators

The configuration of a 128-byte area
8 256 bytes of application areas
Low voltage operation: 2.7V to 5.5V
At least 100,000 erase cycle
At least 10 years data retention

Function Description:
　　SLE4428 capacity 1Kbytes, address space from 0 to 1023. All data except passwords, in any case can be read out after the correct password in the check can be read. All data including the password itself can be written after checking the correct password or change. All data can be protected by byte write, write protect the data, curing, can not be changed under any circumstances. There is a password error counter. Address is 1021. Initial value of 8, the password verification error once, then minus 1. If the counter value is 0, then the entire card data is locked, just read out, can not write or change and can not continue to check the password; if not to 0, then there is only one check is correct, the counter will return to the beginning initial value. Password length 2bytes, address 1022,1023. 216 combinations, the correct password check before reading the results of these two addresses are "00", can not write and change; in the password can be read after checking the correct password, but also change the password, the password will remain valid until card Power-down so far.
　　The only code. Address 21 to 26 is the card user code, the company specifically set up for users worldwide have registered SIEMENS unique user code, to ensure maximum user benefits. Is the only company code is 6D 77 36 36 33 XX (hex), ASCII code is MW663x. 6 bytes XX in the range 00 to FF users within the distribution and use. This code is written will not be changed by the curing. Address 0 to 7, 21 to 26 factory pre-cured by the manufacturer, can not be changed.

Note:
　　SLE4428 three security mechanisms: user password, the only code, curing write. If you do not check the password is correct,
Unable to write data, write the data once written to protect (curing) can not be changed. The only code used as the system
IC card system used in the identification, can avoid the same type of fake card into the system.

　　SLE4428 card without the password can read the entire card data, so the design should pay attention to the contents of encrypted identification data format to prevent spoilers.
　　Whole card is not partitioned, and upon checking the correct password can be any address to write or modify data, design data and pay attention to proper curing to encrypt data to prevent illegal do not intend to destroy data or change data.
Password verification is correct, can be read out. Therefore the design process to be able to prevent vandals used to run illegal interrupt, direct way to read the password to steal passwords.
 
　　Applications: Enterprise / Campus Card office attendance access control card, canteen consumption cards, membership fees, canteen charge card, bus card, highway fees, prepaid card spending cards, car parks, residential management, and other non-contact RF card chip, can do digital printing, Heidelberg four-color printing, signature clause can be added, spray number, bronzing, hot silver, hot laser, magnetic stripe, bar code, drilling and other special process convex code.