General Description

The DS1990A 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 DS1990A has a 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 DS1990A to be used easily

by human operators. Accessories enable the DS1990A

iButton to be mounted on almost any object, including containers,

pallets, and bags.

Features

● Can Be Read in Less Than 5ms

Common iButton Features

● Unique 64-Bit Registration Number Ensures Error-

Free Device Selection and Absolute Traceability

Because No Two Parts are Alike

● Built-In Multidrop Controller for 1-Wire Net

● Digital Identification by Momentary Contact

● Data Can Be Accessed While Affixed to Object

● Economically Communicates to Bus Master with a

Single Digital Signal at 16.3kbps

● 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

Applications

● Access Control

● Work-in-Progress Tracking

● Tool Management

● Inventory Control