DS1993L-F5+ NVRAM 4Kb

The iButton® 4Kb memory 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 DS1993 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 DS1993 to be easily used by human operators. Accessories permit the DS1993 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.

Key Features

• 4096 bits of Read/Write Nonvolatile Memory
• 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