AVAILABLE
Functional Diagrams
Pin Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
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 Thermochron® can be missioned and
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
www.maxim-ic.com/1-Wiredrivers.
USB to 1-Wire/iButton Adapters
1-Wire, iButton, and Thermochron are registered trademarks of Maxim Integrated Products, Inc.
Windows is a registered trademark of Microsoft Corp.
19-4881; Rev 6/11
DS9490R/DS9490B
DS9490R/DS9490B
Figure 1. DS9490R
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
12-BIT
FIXED
(000h)
36-BIT SERIAL
NUMBER
8-BIT FAMILY
CODE (81h)
MSB LSB
MSB LSB
MSB LSB
MSB LSB
2 of 6
DS9490R/DS9490B
PIN CONFIGURATION
Figure 4. 1-Wire RJ11 SOCKET FOR DS9490R
PIN SIGNAL
NAME
DESCRIPTION
1
VDD 5VDC Output
2 GND Power Ground
3
OW 1-Wire Data
4 GND_OW 1-Wire Return
5 SUSO USB Suspend Output
6
N.C. No Connection
Figure 5. iButton SOCKET FOR DS9490B
PIN SIGNAL
NAME
DESCRIPTION
1 OW 1-Wire Data
2
GND_OW 1-Wire Return
*Note: The data contact faces down and away from the embossed ‘i’. Once the iButton is inserted in the
enclosure, snap the end cap over it. The end cap is removed by depressing the release tab with a
paper clip, swinging it fully open, and sliding out the hinge.
Looking into Female RJ11
Connector
6
5
4
3
2
1
3 of 6
DS9490R/DS9490B
DS9490R/DS9490B
MECHANICAL DIMENSIONS
All dimensions are in millimeters.
Figure 6. DS9490R
11.66
3.12
20.42
42.65
13.89
21.54
Figure 7. DS9490B
3.28
11.66
56.82
24.94
16.54
8.74
ENVIRONMENTAL REQUIREMENTS
CONDITION PARAMETER VALUE
Storage Temperature -10°C to +85°C
Storage Relative humidity, noncondensing 95%
Storage Duration 1yr (max) at 95%RH and +85°C
Operating Temperature 0°C to +70°C
Operating Relative humidity, noncondensing 80%
4 of 6
DS9490R/DS9490B
ELECTRICAL CHARACTERISTICS
PARAMETER SPECIFICATION
USB I/F As defined in Chapter 7 of the USB Specification*
1-Wire I/F See the DS2490 data sheet**
The DS9490R and DS9490B consume 58mA in USB active mode and 0.5mA in suspend mode*. The
DS9490R has the VBUS power and ground available on the RJ11 connector. In active mode the current
available to an externally powered fixture is 42mA* (100mA to 58mA); however it is recommended that
no more than 25mA be used. An external circuit can detect when the module is in suspend by monitoring
the SUSO signal on Pin 5 of the RJ11 connector. When this condition is detected, the external circuit must
also go into a low power state. NOTE: The SUSO pin of the DS2490 is an open drain output and requires
a pullup resistor to create a valid signal. See the DS2490 data sheet for the conditions where SUSO is
active. Revision C of the DS9490R and all revisions of the DS9490R# have SUSO routed to the RJ11
connector. The availability of SUSO at the RJ11 connector is not production tested. Therefore, before
relying on SUSO in an application, first verify the presence of this signal with the particular adapter.
*Guaranteed by design, not production tested.
**Tested at DS2490 component level.
Figure 8. FUNCTIONAL DIAGRAM
EMI Filter
VBUS
D-
D+
GND
VIN VOUT
EN
N/C GND
LP2980IM5-3.3
PMOD VD
NC NC
NC NC
NC NC
VB X1
SUSO X0
D- NC
D+ VPP
NC NC
OW NC
NC NC
GND NC
DS2490
C2
1.0uF
EMI Filter
C3
4.7
R2 24
R3 24
R1
1.5K
C1
0.1uF
OW
GND
DS2401
OW
GND
DS9503
USB
Connector
C6
33pF
C5
33pF
X1
12Mhz
L1
L2
C7
33pF
C8
33pF
U1
U2
U3
U4
J2
1
2
1
2
J1
1
2
3
4
1
3
4
5
2
1
5
7
8
12
24
19
20
17
10
1
2
3
4
5
6
Female RJ11
DS9490R
DS9490B
1
2
iButton Socket
J3
6
5
3
1
R7 10
5 of 6
DS9490R/DS9490B
DS9490R/DS9490B
REVISION HISTORY
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
5/03 Initial release —
1/07
Added RoHS-compliant part numbers to the Ordering Information
table; replaced product graphics with product photos; changed
schematic and Figure 4 to route the SUSO signal to RJ11 pin 5;
reworded the text in the Electrical Characteristics section to include
the
SUSO
pin and its use
1, 2, 3, 5
8/09
Removed references to leaded packages in the Ordering Information
table; added the Revision History table
1, 6
6/11
Deleted reference to monetary iButtons; added reference to the
Connectivity Matrix table in the DS1402x 1-Wire network cables data
sheet; revised description and URL for software drivers download
1
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical
Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
© 2011 Maxim Integrated The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc.
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