MAXIM DS9490B

19-4881; Rev 8/09
DS9490R/DS9490B
USB to 1-Wire/iButton Adapter
www.maxim-ic.com
FEATURES







TYPICAL OPERATING CIRCUIT
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
PC
PC



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. 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.
DS9490B
USB
iButton
DS9490R
DS1402D-DR8
ORDERING INFORMATION
PART
DESCRIPTION
DS9490B# USB Single F5 iButton Holder
with Protective Cap
DS9490R# USB to 1-Wire RJ11
APPLICATIONS

USB
#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 anti-static
bag.
1-Wire, iButton, and Thermochron are registered trademarks of Maxim
Integrated Products, Inc.
Blue Dot is a trademark of Maxim Integrated Products, Inc.
Windows and Windows XP are registered trademarks of Microsoft Corp.
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® 98, Windows 2000, Windows ME, and Windows XP® operating
website
under
software
support
at
systems
can
be
found
on
the
iButton
www.maxim-ic.com/products/ibutton/software/tmex/index.cfm.
1 of 6
DS9490
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
MSB
LSB
12-BIT
FIXED
(000H)
MSB
36-BIT SERIAL
NUMBER
LSB MSB
8-BIT FAMILY
CODE (81H)
LSB MSB
2 of 6
LSB
DS9490
PIN CONFIGURATION
Figure 4. 1-Wire RJ11 SOCKET FOR DS9490R
PIN
1
2
3
4
5
6
SIGNAL
NAME
DESCRIPTION
VDD
GND
OW
GND_OW
5VDC Output
Power Ground
1-Wire Data
1-Wire Return
USB Suspend Output
No Connection
SUSO
N.C.
6
5
4
3
2
1
Looking into Female RJ11
Connector
Figure 5. iButton SOCKET FOR DS9490B
PIN
1
2
SIGNAL
NAME
OW
GND_OW
DESCRIPTION
1-Wire Data
1-Wire Return
2
1
*
*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.
3 of 6
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
Storage
Storage
Storage
Operating
Operating
PARAMETER
VALUE
-10°C to +85°C
95%
Temperature
Relative humidity, noncondensing
Duration
Temperature
Relative humidity, noncondensing
1yr (max) at 95%RH and +85C
0°C to +70°C
80%
4 of 6
DS9490
ELECTRICAL CHARACTERISTICS
PARAMETER
USB I/F
1-Wire I/F
SPECIFICATION
As defined in Chapter 7 of the USB Specification*
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
USB
Connector
VBUS
DD+
GND
EMI Filter
1
L1
2
3
4
C1
0.1uF
LP2980IM5-3.3
EMI Filter
1
L2
3
J1
C2
1.0uF
4
VIN
EN
N/C
VOUT
GND
5
C3
4.7
1
2
R1
1.5K
U1
5
R2 24
7
8
R3 24
10
C7
33pF
DS2401
OW
GND
C8
33pF
12
DS2490
U2
PMOD
NC
NC
NC
VB
SUSO
DD+
NC
OW
NC
GND
VD
NC
NC
NC
X1
X0
NC
VPP
NC
NC
NC
NC
24
1
19
X1
12Mhz
20
17
3
C6
33pF
C5
33pF
U3
2
DS9503
1
6
5
R7 10
1
OW
GND
U4
Female RJ11
2
1
2
3
4
5
6
J2
DS9490R
iButton Socket
1
2
J3
DS9490B
5 of 6
DS9490
REVISION HISTORY
REVISION
DATE
8/09
DESCRIPTION
Removed references to leaded packages in the Ordering Information
table.
PAGES
CHANGED
1
6 of 6
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.
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© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.