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.
Key Features
Applications/Uses
Unique Factory-Lasered 64-Bit Registration
Number Assures 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
Presence Detector Acknowledges when Reader
First Applies Voltage
Designed to meet UL#913 (4th Edit.); Intrinsically
Safe Apparatus: Under Entity Concept for use in
Class I, Division 1, Group A, B, C, and D
Locations, contact Dallas Semiconductor for
certification schedule
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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