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Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
GENERAL DESCRIPTION
The DS1990A Serial Number iButtonÒ is a rugged
data carrier that serves as an electronic registration
number for automatic identification. Data is trans-
ferred serially through the 1-WireÒ protocol, which
requires only a single data lead and a ground return.
Every DS1990A 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 DS1990A to be
used easily by human operators. Accessories permit
the DS1990A iButton to be mounted on almost any
object, including containers, pallets, and bags.
APPLICATIONS
§ Access Control
§ Work-In-Progress Tracking
§ Tool Management
§ Inventory Control.
F3 and F5 MicroCAN
0.51
5.89
IO
16.25
17.35
89 01
000000FBC52B
â
1-Wireâ
â
3.10
IO GND
0.51
GND
F3 size F5 size Branding
All dimensions are shown in millimeters.
SPECIAL FEATURES
§ Can Be Read in Less Than 5ms
§ Operating Range: 2.8V to 6.0V, -40°C to +85°C
COMMON iButton FEATURES
§ 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
§ Meets UL#913 (4th Edit.); Intrinsically Safe
Apparatus: Approved Under Entity Concept for
use in Class I, Division 1, Group A, B, C, and D
Locations
ORDERING INFORMATION
PART TEMP RANGE PACKAGE
DS1990A-F5 -40°C to +85°C F5 iButton
DS1990A-F3 -40°C to +85°C F3 iButton
EXAMPLES OF ACCESSORIES
PART DESCRIPTION
DS9096P Self-Stick Adhesive Pad
DS9101 Multipurpose Clip
DS9093RA Mounting Lock Ring
DS9093A Snap-In Fob
DS9092 iButton Probe
DS1990
Serial Number iButton
www.maxim-ic.com
iButton, 1-Wire, and MicroCAN are registered trademarks of
Dallas Semiconductor.