PCF2042 V2 Memory Card IC

The PCF2042 contains a 256 x 8-bit EEPROM with programmable write protection for each of the first 32 bytes. Reading of the whole memory is always possible. The memory CAN be written and erased byte by byte. Each of the first 32 bytes CAN be write/erase protected by setting a Protection bit (EEPROM converted to ROM). If set once, the Protection bit cannot be erased.Additionally, the PCF2042 allows for a verification procedure. The whole memory, excluding the Reference Data, CAN be read always. The memory CAN be written or erased only after a successful comparison of the verification data. After three successive incorrect entries an internal error Counter will block any subsequent attempt to compare the verification data, and hence blocks any possibility to write and erase.
By NXP Semiconductors
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