iButton 1Kb/4Kb Memory

The iButton® 1Kb/4Kb memory (DS1992) is a rugged read/write data carrier that act as a localized database, easily accessible with minimal hardware. The nonvolatile memory and optional timekeeping capability offer a simple solution to storing and retrieving vital information pertaining to the object to which the iButton device is attached. Data is transferred serially through the 1-Wire® protocol that requires only a single data lead and a ground return.

The scratchpad is an additional page that acts as a buffer when writing to memory. Data is first written to the scratchpad where it can be read back. After the data has been verified, a copy scratchpad command transfers the data to memory. This process ensures data integrity when modifying the memory. A 48-bit serial number is factory lasered into each DS199 to provide a guaranteed unique identity that allows for absolute traceability. The durable MicroCan® package is highly resistant to environmental hazards such as dirt, moisture, and shock. Its compact coin-shaped profile is self-aligning with mating receptacles, allowing the DS199 to be easily used by human operators. Accessories permit the DS199 to be mounted on almost any surface including plastic key fobs, photo-ID badges, and PC boards. Applications include access control, work-in-progress tracking, electronic travelers, storage of calibration constants, and debit tokens.

Applications

* Debit Tokens * Electronic Travelers * Storage of Calibration Constants * Work-in-Progress Tracking

* 4096 bits of Read/Write Nonvolatile Memory (DS1993)

* 1024 bits of Read/Write Nonvolatile Memory (DS1992)

* 256-bit Scratchpad Ensures Integrity of Data Transfer

* Memory Partitioned into 256-bit Pages for Packetizing Data

* Data Integrity Assured with Strict Read/Write Protocols

* Operating Temperature Range from -40°C to +70°C

* Over 10 years of data retention

* 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 and Information by Momentary Contact

* Chip-Based Data Carrier Compactly Stores Information

* Data Can be Accessed While Affixed to Object

* Economically Communicates to Bus Master with a Single Digital Signal at 16.3kbps

* Standard 16mm Diameter and 1-Wire 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, 5th Ed., Rev. 1997-02-24; Intrinsically Safe Apparatus, Approved under Entity Concept for use in Class I, Division 1, Group A, B, C, and D Locations