 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.
Key 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 and tested 64-bit registration number (8-bit
family code + 48-bit serial number + 8-bit CRC tester) assures absolute
traceability because no two parts are alike
- Multidrop controller for MicroLAN
- Digital identification by momentary contact
- Chip-based data carrier compactly stores information
- Data can be accessed while affixed to an object
- Economically communicates to bus master with a single digital signal at
16.3k bits per second
- Standard 16 mm diameter and 1-WireTM protocol ensure compatibility with
iButton family
- Button shape is self-aligning with cup shaped probes
- Durable stainless steel case engraved with registration number
withstands harsh environments
- 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
- Meets UL#913 (4th Edit.); Intrinsically Safe Apparatus, Approved under
Entity Concept for use in Class 1, Division 1, Group A, B, C and D locations
iButton and 1-Wire are registered trademarks of Dallas Semiconductor
Corporation |
