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AVAILAB
LE
DS9490R/DS9490B
USB to 1-Wire/iButton Adapters
DS9490B
DS9490R
DS9490B#
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 ? Interface and
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.
? be missioned and
? iButton Initialization and Download—Loggers
like the Thermochron Functional Diagrams
downloaded.
? 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.
TYPICAL OPERATING CIRCUIT
PC USB
iButton
PC USB
DS1402D-DR8
ORDERING INFORMATION
PART TYPE
USB Single F5 iButton Holder
with Protective Cap
DS9490R# USB-to-1-Wire RJ11
#Denotes a RoHS-compliant device that may include lead(Pb) that is
exempt under the RoHS requirements.
PACKAGING/SHIPPING
INFORMATION
The part is shipped individually in an antistatic
bag.
DESCRIPTION
Pin Configurations appear at end of data
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. For a list of suitable 1-Wire network cables, refer to the Connectivity Matrix
table in the DS1402x 1-Wire network cables data sheet. Both adapters are based on the DS2490 USB-to-
1-Wire bridge chip. Free software drivers for Windows ? -based PCs can be downloaded from
www.maxim-ic.com/1-Wiredrivers sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a and trademark of are registered Products, Inc.
1-Wire, iButton, Thermochron Maxim Integrated trademarks of Maxim Integrated Products, Inc.
Windows is a registered trademark of Microsoft Corp.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maxim integrated .com.
19-4881; Rev 6/11
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