Contact type 4442 main index card:
● 32 bit protected memory;
● 256 byte EEPROM;
● 3 bytes of
Contact type 4442 main index card:
● 32 bit protected memory;
● 256 byte EEPROM;
● 3 bytes of user password, password error count: 3;
● temperature range: 0 ~ 70 ℃;
● at least 100000 times erasable;
● at least 10 year data retention period.
● working voltage: 5V.
Two, contact made 4442 card security characteristics:
1, 4442 card write protected area (32 bytes) of each byte can be individually write protection,write protection, content can not be changed (i.e. solidify data).
2, 4442 card password check correctly, all data can be read, if necessary, may be appropriatefor data encryption.
3, 4442 card check the correct password can be written or modified.
4, 4442 card three bytes of user password, check the correct can be altered, effective to cardelectric.
5, 4442 card password error counter, the initial value is 3, the password check error 1, then 1,if the counter value is 0, then the card is locked automatically, data can only be read, no further changes are also not password check; if not zero, one time password check is correct,can recover to the initial value.
