DS9490B 1-Wire/iButton Adapters Datasheet

DS9490B Datasheet, PDF, Equivalent


Part Number

DS9490B

Description

USB to 1-Wire/iButton Adapters

Manufacture

Maxim Integrated

Total Page 6 Pages
Datasheet
Download DS9490B Datasheet


DS9490B
AVAILABLE
DS9490R/DS9490B
USB to 1-Wire/iButton Adapters
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.
iButton Initialization and Download—Loggers
like the ThermochrFoun®nccatniboenmailssDioinaedgarnadms
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
DS9490B iButton
PC USB DS9490R
DS1402D-DR8
ORDERING INFORMATION
PART
TYPE
DS9490B#
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
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
wwPiwn C.monafixgiumra-tiiocn.scoapmp/e1ar-Wat einrdedorf idvaetarssh. eet.
Functional Diagrams continued at end of data sheet.
1-WUirCe,SiBPuitstoan,tarandd eTmhearrmkoocfhrMonaxairme rIengteisgterraetdedtraPdreomdaurcktsso, fInMca.xim 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.maximintegrated.com.
19-4881; Rev 6/11

DS9490B
Figure 1. DS9490R
DS9490R/DS9490B
Figure 2. DS9490B
*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’. Before inserting the paper clip disconnect the
DS9490B from the USB bus.
Each USB bridge contains a unique built-in identification chip. The identification chip is a custom DS2401
that is a 64-bit ID number (see Figure 3).
Figure 3. DS2401 ID CHIP 64-BIT LASERED ROM
MSB
LSB
8-BIT
CRC CODE
MSB
LSB
12-BIT
FIXED
(000h)
36-BIT SERIAL
NUMBER
8-BIT FAMILY
CODE (81h)
MSB
LSB MSB
LSB MSB
LSB
2 of 6


Features AVAILABLE DS9490R/DS9490B USB to 1-Wire /iButton Adapters FEATURES  High-Sp eed 12Mbps Universal Serial Bus (USB) I nterface  Supports Standard and Over drive 1-Wire® Communication  Slew-R ate-Controlled 1-Wire Timing and Active Pullup for Improved 1-Wire Network Per formance  DS9490R has an RJ11 Interf ace for Standard Connectivity Accessori es such as the DS1402D-DR8  DS9490B has an iButton® Interface and Retains a Fixed iButton  Built-In Custom DS2 401 Identification Chip  Reads all 1 -Wire and iButton Devices. Writes All E xcept EPROM 1-Wire/iButton Devices APPL ICATIONS  Software Authorization—P rotection against software piracy by ty ing software operation to the presence of iButton hardware.  iButton Initia lization and Download—Loggers like th e ThermochrFoun®nccatniboenmailssDioin aedgarnadms downloaded.  Demonstrati on—Demonstrate the features of iButto ns or 1-Wire chips on personal computer s.  Development—Aid development of 1-Wire applications by providing a PC interface to verif.
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