The DS1982 1K Add-Only iButton is a rugged data carrier that serves as a read/write nonvolatile memory. Data is transferred serially through the 1-Wire protocol, which requires only a single data lead and a ground return for communication. The DS1982 contains a unique 64-bit ROM registration number that ensures absolute traceability. Because each DS1982 is factory lasered with a guaranteed unique 64-bit registration number, multiple devices can reside on the same 1-Wire bus and be individually distinguished.

Applications:

• Asset tracking
• Electronic cash handles
• Access control
• Work-in-progress tracking
• Tool management

Features:

• 1024 bits of add-only EEPROM memory partitioned into four 256-bit pages
• Built-in multidrop controller for single-point control of multiple devices
• 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
• Low-cost electronic key for access control
• Button-shaped package is rugged enough to withstand harsh environments
• Communicates to host with a single digital signal at 14.2kbps using 1-Wire protocol
• Operating temperature range of -40°C to +85°C

Benefits:

• Provides secure, read/write nonvolatile memory for various applications.
• Enables easy identification and tracking of assets.
• Simplifies system design with its single-wire communication interface.
• Offers a robust and durable solution for harsh operating environments.

The device derives its power from the 1-Wire communication line; therefore, no external power supply is needed. The DS1982's EEPROM memory is written block by block in write-once mode. An attempted write to an already programmed block has no effect. The 64-bit registration number is an important feature that guarantees that each device is unique and traceable.