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 containers, pallets, and bags.
   
SPECIAL FEATURES
■ 32KB EEPROM Organized as Pages of 64 Bytes
    Each
■ Optional Password Protection with Different 64-
    Bit Passwords for Read and Full Access
■ Communicates to Host with a Single Digital
    Signal at Up to 15.3kbps at Standard Speed or
    Up to 125kbps in Overdrive Mode Using 1-Wire
    Protocol
■ Operating Range: 2.8V to 5.25V, -40C to +85C
■ Minimum 100k Write Cycles Endurance
■ 15kV Built-in ESD Protection
   
COMMON iButton FEATURES
■ Unique Factory-Lasered 64-Bit Registration
    Number Assures Error-Free Device Selection
    and Absolute Traceability Because No Two Parts
    are Alike
■ Built-In Multidrop Controller for 1-Wire Net
■ Chip-Based Data Carrier Stores Digital
    Identification and Information, Armored in a
    Durable Stainless-Steel Case
■ Data can be Accessed While Affixed to Object
■ Button Shape is Self-Aligning with Cup-Shaped
    Probes
■ Easily Affixed with Self-Stick Adhesive Backing,
    Latched by its Flange, or Locked with a Ring
    Pressed onto its Rim
■ Presence Detector Acknowledges when Reader
    First Applies Voltage
   
APPLICATIONS
    Maintenance/Inspection Data Storage
    Medical Data Carrier
    Health Data Carrier
    Audit Data Storage and Carrier