19-4890; Rev 11/09 DS1977 Password-Protected 32KB EEPROM iButton iButton DESCRIPTION The DS1977 is a 32KB EEPROM in a rugged, iButton® enclosure.
Access to the memory can be password-protected with different passwords for read-only and full access.
Data is transferred serially through the 1-Wire® protocol, which requires only a single data lead and a ground return.
Every DS1977 is factory lasered with a guaranteed unique 64-bit registration number that allows for absolute traceability.
The durable stainless-steel iButton package is highly resistant to environmental hazards such as dirt, moisture, and shock.
Accessories permit the DS1977 iButton to be mounted on almost any object, including...

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