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Technical parameters of FM4442 card:

1.256 bytes EEPROM organization mode

2.32-bit protected memory composition

3.3 byte user password, password error count: 3 times

4. Temperature range: -30--70 degrees

5. At least 100,000 erases

6. At least 10 years of data storage

7. Minimum write/erase time: 2.5ms

8. Working voltage: 5V

9. Maximum power supply current: 10mA

Factory has solidified user code 32 bytes write protection data area

FM4442 card security features

1. Each byte of the write protection zone (the first 32 bytes) can be individually written for protection, and the content cannot be changed after the writing protection (i.e., solidified data).

2. Before password verification, all data can be read. If necessary, the data can be properly encrypted.

3, check the correct password can be written or modified.

4. Three-byte user password, which can be changed after verification, is valid until the card is powered down.

5, password error counter, the initial value is 3, password check error 1 time, then minus 1, if the counter value is 0, the card automatically locked, data can only be read, can not be changed or password check;If not zero, a password check is correct, 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.

FM4442 is suitable for business electronic consumption card, campus card, dining card, attendance card, inquiry card, door lock card, management card, traffic management card, tax management card, medical care card, public utility management card, etc.