Key Features
- Upgrade of DS1990 allows multiple Serial Number iButtons to reside on a common bus
- Unique 48–bit serial number
- Low-cost electronic key for access control
- 8-bit CRC for checking data integrity
- Can be read in less than 5 ms
- Operating temperature range of -40°C to +85°C
Common iButton Features
- Digital Identification and Information by Momentary Contact.
- 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 1-Wire Net.
- Chip-Based Data Carrier Compactly Stores Information.
- Data Can be Accessed While Affixed to Object.
- 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.
The DS1990R Serial Number iButton is a rugged data carrier that serves as an electronic registration number for automatic identification. Data is transferred serially through the 1-Wire protocol, which requires only a single data lead and a ground return. Every DS1990R 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. Its compact coin-shaped profile is self-aligning with mating receptacles, allowing the DS1990R to be used easily by human operators. Accessories permit the DS1990R iButton to be mounted on almost any object, including containers, pallets, and bags. The DS1990R is a fully compatible variant of the DS1990A. In applications where a presence pulse on contact is critical the DS1990R should be preferred over the DS1990A.
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