4442IC card (contact IC card)

A, 4442IC card main indicators.

 256-byte EEPROM organization

 32-bit protected memory composition

 3-byte user password, password error count: 3 times

 Temperature range: 0 ℃ - 70 ℃

 Erase and write at least 100,000 times

 Data retention period of at least 10 years

 Minimum write / erase time: 2.5ms

 Operating voltage: 5V

 Maximum current: 10mA

Factory cured user code 32 bytes of write-protected data area

Second, the 4442IC card storage area allocation

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

92 23 10 01 46 0b 81 15 ff ff ff ff ff ff ff ff ff ff

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Data area

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Three, 4442 IC card confidentiality characteristics.

① Each byte of the write-protected area (the first 32 bytes) can be individually write-protected. After write protection, the content cannot be changed (i.e., solidified data)

②All data can be read until the password is properly checked. If necessary, data can be encrypted appropriately.

③After checking the correct password, it can be written or modified.

④After checking the correct password, the three-byte user password can be changed until the card is powered down.

⑤Password error counter, the initial value is 3, password check error 1 time, reduce 1 time, if the counter value is 0, the card is automatically locked, data can only be read, can not change or check the password; if not zero, the password check is correct, can be restored to the initial value.

⑥0-5, 6-7 byte address has been written by the manufacturer before leaving the factory, can not be changed.

Fourth, the 4442IC use the card precautions

in addition, the password area is not addressed in the 0-256 bytes. 4442IC when the cards password protection mechanism decides to check the password, the number of errors must not exceed 3 times. After more than 3 times, the chip will be automatically locked. Locked thick chip can only read the card, can not change the internal data.