DS1972 1024-Bit EEPROM iButton www.
maxim-ic.
com iButton DESCRIPTION The DS1972 is a 1024-bit, 1-Wire EEPROM organized as four memory pages of 256 bits each in a rugged iButton package.
Data is written to an 8byte scratchpad, verified, and then copied to the EEPROM memory.
As a special feature, the four memory pages can individually be write protected or put in EPROM-emulation mode, where bits can only be changed from a 1 to a 0 state.
The DS1972 communicates over the single-conductor 1-Wire bus.
The communication follows the standard Dallas Semiconductor 1-Wire protocol.
Each device has its own unalterable and unique 64-bit ROM registration number that is factory laser...

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