DS1990R-F5 Maxim Integrated Products, DS1990R-F5 Datasheet

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DS1990R-F5

Manufacturer Part Number
DS1990R-F5
Description
Serial Number Registration
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of DS1990R-F5

Lead Free Status / Rohs Status
No

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Part Number
Manufacturer
Quantity
Price
Part Number:
DS1990R-F5#
Manufacturer:
Maxim Integrated Products
Quantity:
1 799
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.
www.iButton.com
GENERAL DESCRIPTION
The DS1990R 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 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.
APPLICATIONS
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MicroCANÒ
IO
iButton, 1-Wire, and MicroCAN are registered trademarks of
Dallas Semiconductor.
F3 size
Access Control
Work-In-Progress Tracking
Tool Management
Inventory Control
3.10
GND
All dimensions are shown in millimeters.
0.51
IO
F5 size
5.89
GND
0.51
89
000000FBC52B
Branding
1-Wire
â
â
â
01
16.25
17.35
1 of 8
SPECIAL FEATURES
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COMMON iButton FEATURES
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ORDERING INFORMATION
EXAMPLES OF ACCESSORIES
DS1990R-F5
DS1990R-F3
DS9096P
DS9101
DS9093RA
DS9093A
DS9092
Upgrade of DS1990A Guarantees Presence
Pulse on Contact
Can be Read in Less Than 5ms
Operating Range: 2.8V to 6.0V, -40°C to +85°C
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
PART
PART
Self-Stick Adhesive Pad
Multipurpose Clip
Mounting Lock Ring
Snap-In Fob
iButton Probe
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Serial Number iButton
DESCRIPTION
DS1990R
PACKAGE
F5 iButton
F3 iButton
REV: 082906

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DS1990R-F5 Summary of contents

Page 1

... Designed to meet UL#913 (4th Edit.); Intrinsically Safe Apparatus: Under Entity Concept for use in Class I, Division 1, Group and D Locations, contact Dallas Semiconductor for certification schedule ORDERING INFORMATION â PART 16.25 DS1990R-F5 01 â DS1990R-F3 17.35 â EXAMPLES OF ACCESSORIES PART DS9096P DS9101 DS9093RA ...

Page 2

... PHYSICAL SPECIFICATION Size Weight DS1990R ABSOLUTE MAXIMUM RATINGS IO Voltage to GND IO Sink Current Junction Temperature Storage Temperature Range Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied ...

Page 3

... IO 64-BIT LASERED ROM Each DS1990R contains a unique ROM code that is 64 bits long. The first 8 bits are a 1-Wire family code. The next 48 bits are a unique serial number. The last 8 bits are a CRC of the first 56 bits. See Figure 2 for details. The 1- Wire CRC is generated using a polynomial generator consisting of a Shift and XOR gates as shown in Figure 3. ...

Page 4

... X 1-Wire BUS SYSTEM The 1-Wire bus is a system, which has a single bus master and one or more slaves. In all instances the DS1990R is a slave device. The bus master is typically a microcontroller or PC. For small configurations the 1-Wire communication signals can be generated under software control using a single port pin. Alternatively, the DS2480B 1-Wire line driver chip or serial port adapters based on this chip (DS9097U series) can be used ...

Page 5

... All transactions on the 1-Wire bus begin with an initialization sequence. The initialization sequence consists of a reset pulse transmitted by the bus master followed by presence pulse(s) transmitted by the slave(s). The presence pulse lets the bus master know that the DS1990R is on the bus and is ready to operate. For more details, see the 1-Wire Signaling section. ...

Page 6

... DS1990R contains only the 64-bit ROM without any additional data fields, Match ROM and Skip ROM are not applicable. The DS1990R will remain silent (inactive) upon receiving a ROM function command that it doesn't support. This allows the DS1990R to coexist on a multidrop bus with other 1-Wire devices that do respond to Match ROM or Skip ROM (example DS1990R and DS1994). ...

Page 7

... The initialization sequence required to begin any communication with the DS1990R is shown in Figure 6. A Reset Pulse followed by a Presence Pulse indicates the DS1990R is ready to receive a ROM function command. If the bus master uses slew-rate control on the falling edge, it must pull down the line for t edge. Figure 6. INITIALIZATION PROCEDURE “ ...

Page 8

... During the t RL data line low; its internal timing generator determines when this pulldown ends and the voltage starts rising again. When responding with a 1, the DS1990R will not hold the data line low at all, and the voltage starts rising as soon over. ...

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