Table of Contents
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FEATURES
§ High-Speed 12Mbps Universal Serial Bus
(USB) Interface
§ Supports Standard and Overdrive 1-Wire
Communication
§ Slew-Rate-Controlled 1-Wire Timing and
Active Pullup for Improved 1-Wire Network
Performance
§ DS9490R has an RJ11 Interface for Standard
Connectivity Accessories such as the
DS1402D-DR8
§ DS9490B has an iButton
Retains a Fixed iButton
§ Built-In Custom DS2401 Identification Chip
§ Reads all 1-Wire and iButton Devices. Writes
All Except EPROM 1-Wire/iButton Devices
APPLICATIONS
§ Software Authorization—Protection against
software piracy by tying software operation to
the presence of iButton hardware.
§ iButton Initialization and Download—
Loggers like the Thermochron
missioned and downloaded. Monetary
iButtons can be refilled with money.
§ Demonstration—Demonstrate the features of
iButtons or 1-Wire chips on personal
computers.
§ Development—Aid development of 1-Wire
applications by providing a PC interface to
verify device contents and state.
DESCRIPTION
The DS9490B is a USB bridge and holder for a single F5-size iButton. The iButton is securely held
behind a latched door. The DS9490R is a USB bridge with 1-Wire RJ11 interface to accommodate 1-
Wire receptacles and networks. The DS1402D-DR8 (Blue Dot™) can readily be used in conjunction with
the DS9490R to create an iButton PC reader. Both adapters are based on the DS2490 USB to 1-Wire
bridge chip.
PC software drivers for Windows
the iButton website under software support at:
1-Wire, iButton, and Thermochron are registered trademarks of
Dallas Semiconductor.
Blue Dot is a trademark of Dallas Semiconductor.
Windows is a registered trademark of Micosoft Corp.
®
®
Interface and
®
can be
®
98, Windows 2000, Windows ME, and Windows XP can be found on
http://www.ibutton.com/software/tmex/index.html
1 of 5
DS9490R/DS9490B
USB to 1-Wire/iButton Adapter
TYPICAL OPERATING CIRCUIT
USB
PC
USB
PC
DS1402D-DR8
ORDERING INFORMATION
PART
DESCRIPTION
DS9490B
USB Single F5 iButton Holder
with Protective Cap
DS9490R
USB to 1-Wire RJ11
PACKAGING/SHIPPING
INFORMATION
The part is shipped individually in an anti-static
bag.
DS9490B
iButton
DS9490R
050503
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Table of Contents
Related Manuals for Maxim DS9490R
Summary of Contents for Maxim DS9490R
- Page 1 The DS9490R is a USB bridge with 1-Wire RJ11 interface to accommodate 1- Wire receptacles and networks. The DS1402D-DR8 (Blue Dot™) can readily be used in conjunction with the DS9490R to create an iButton PC reader. Both adapters are based on the DS2490 USB to 1-Wire bridge chip.
- Page 2 DS9490 Figure 1. DS9490R * Color subject to change Figure 2. DS9490B * Color subject to change *Note: To eject an iButton, insert a straightened paper clip into the side access hole of the DS9490B. Push the paper clip in the direction of the iButton. A different iButton can then be inserted. The data contact faces down and away from the embossed ‘i’.
-
Page 3: Pin Configuration
DS9490 PIN CONFIGURATION Figure 4. 1-WIRE RJ11 SOCKET FOR DS9490R SIGNAL DESCRIPTION NAME 5VDC Output Power Ground 1-Wire Data GND_OW 1-Wire Return Looking into Female RJ11 5, 6 N.C. No Connection N.C. No Connection Figure 5. iBUTTON SOCKET FOR DS9490B... -
Page 4: Mechanical Dimensions
DS9490 MECHANICAL DIMENSIONS All dimensions are in millimeters. Figure 6. DS9490R 11.66 20.42 42.65 13.89 21.54 3.12 Figure 7. DS9490B 56.82 24.94 11.66 8.74 16.54 3.28 ENVIRONMENTAL REQUIREMENTS CONDITION PARAMETER VALUE Storage Temperature -10°C to +85°C Storage Relative humidity, noncondensing... -
Page 5: Electrical Characteristics
An external circuit cannot detect when the module is in suspend or active mode. Consequently, when in suspend mode, the DS9490R module with external circuit combination is in violation of the USB power specification. Application developers should be aware of this when using this module in conjunction with an externally powered circuit on power restricted platforms such as laptops.
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