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The 4442 card is a 256-byte encryption card, and there are read data, write data, protect data, and password operations.
Product Details
The 4442 card is a 256-byte encryption card, and there are read data, write data, protect data, and password operations.
electrical performance]
● 256 × 8-bit EEPROM
● Byte direct addressing
Low address 32 bytes of data set unrecoverable write protection bit
● 32-bit protection bits
● Write data operation end flag
● Reset response in accordance with 7816-3 standard
● Byte erase and then write time: standard value 25ms
● A minimum of 10000 write-erase cycles
● Data retention period: 10 years
confidential characteristics]
● Three-byte user password.
● Before the password is checked correctly, all data can only be read and cannot be rewritten.
● After checking that the password is correct, the data can be changed, including the password.
● Error counter, with an initial value of 3. If the password check goes wrong once, it will be reduced by 1. If the counter value is 0, the card will be automatically locked, the data can only be read out, and no further changes can be made or password check can be made. If it is not zero, once the password check is correct, it can be restored to the initial value of 3.
● Each byte of the write protection area (the first 32 bytes) can be write protected separately. After write protection, the content cannot be changed (I. e., curing data).
Notes on writing procedures]
1. Excluding the 32 bytes of the write protection area, the programmer can only operate 224 bytes, and the write protection area is written only once, such as an opportunity, which is generally not used.
2. Note that after rewriting the password each time, the password will only take effect after the card is powered off.
3. The password is 3 bytes, that is, 24 bits. The general travel password is' 25525555', which is converted into six F's in hexadecimal, that is, 'FFFFFF'. The chips commonly used in the market are Siemens SLE5542. There are also FM5542 of Fudan and AM5542 of ATMEL, which are commonly used in hotel door locks and stored-value card systems.
main index]
256 Bytes EEPROM Organization
32-bit protection memory composition method
3-byte user password, password error count: 3 times
Temperature range: 0 ℃ -70 ℃
Erase at least 100000 times
Minimum 10-year data retention period
Minimum write/erase time: 2.5ms
Working voltage: 5V
Maximum supply current: 10mA
The 32-byte write-protected data area of the user code has been solidified at the factory.
confidential characteristics]
1. Each byte of the write protection area (the first 32 bytes) can be write protected separately. After write protection, the content cannot be changed (I. e. solidified data)
2. All data can be read before the password is checked correctly. If necessary, the data can be properly encrypted.
3. After checking the password is correct, it can be written or modified.
4. The three-byte user password can be changed after checking it correctly until the card is powered off.
5. Password error counter, with an initial value of 3. If the password check goes wrong once, it will be reduced by 1. If the counter value is 0, the card will be automatically locked, the data can only be read out, and no further changes can be made or password check can be carried out. If it is not zero, once the password is checked correctly, it can be restored to the initial value.
6. Byte addresses 0-5 and 6-7 have been written by the manufacturer before leaving the factory and cannot be changed.
encapsulation material]PVC
Standard card size]85.5 × 54 × 0.8( /-0.04)mm, the card can be offset/silk-screen printed in the factory in advance, or printed with a small card printer.
This product can be applied to industries: medical, catering, water and electricity, hotel, city card, insurance, education and other industries
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