View DS9490_294172.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

DS9490R/DS9490B
USB to 1-Wire/iButton Adapter
www.maxim-ic.com
FEATURES
High-Speed 12Mbps Universal Serial Bus (USB) Interface Supports Standard and Overdrive 1-Wire(R) 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(R) 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 Software Authorization--Protection against software piracy by tying software operation to the presence of iButton hardware. iButton Initialization and Download-- Loggers like the Thermochron(R) 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.
TYPICAL OPERATING CIRCUIT
PC
USB DS9490B
iButton
PC
USB
DS9490R DS1402D-DR8
APPLICATIONS

ORDERING INFORMATION
PART DS9490B DS9490R DESCRIPTION USB Single F5 iButton Holder with Protective Cap USB to 1-Wire RJ11

PACKAGING/SHIPPING INFORMATION
The part is shipped individually in an anti-static 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 1Wire receptacles and networks. The DS1402D-DR8 (Blue DotTM) 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(R) 98, Windows 2000, Windows ME, and Windows XP can be found on the iButton website under software support at: http://www.ibutton.com/software/tmex/index.html
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.
1 of 5
050503
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'. 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 8-BIT CRC CODE MSB LSB 12-BIT FIXED (000H) MSB 36-BIT SERIAL NUMBER LSB MSB LSB 8-BIT FAMILY CODE (81H) LSB MSB LSB
2 of 5
DS9490
PIN CONFIGURATION Figure 4. 1-WIRE RJ11 SOCKET FOR DS9490R
PIN 1 2 3 4 5, 6 6 SIGNAL NAME VDD GND OW GND_OW N.C. N.C. DESCRIPTION 5VDC Output Power Ground 1-Wire Data 1-Wire Return No Connection No Connection
6
5
4
3
2
1
Looking into Female RJ11
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, swinging it fully open, and sliding out the hinge.
3 of 5
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 Temperature Relative humidity, noncondensing Duration Temperature Relative humidity, noncondensing VALUE -10C to +85C 95% 1yr (max) at 95%RH and +85C 0C to +70C 80%
4 of 5
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. Note that in suspend mode there is zero current available to an external circuit. 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.
*Guaranteed by design, not production tested. **Tested at DS2490 component level.
Figure 8. FUNCTIONAL DIAGRAM
USB Connector VBUS DD+ GND
J1 1 2 3 4 EMI Filter L2 C2 1.0uF 1 3 4
EMI Filter
L1 C1 0.1uF 5 C3 4.7 2 R1 1.5K 5 R2 24 7 8 10 C7 33pF C8 33pF 12 1
LP2980IM5-3.3 VIN EN N/C
U1
VOUT GND
DS2490 PMOD NC NC NC VB SUSO DD+ NC OW NC GND
U2 24
R3 24
VD NC NC NC X1 X0 NC VPP NC NC NC NC
19 20 17 3 C6 33pF
1 X1 12Mhz
C5 33pF
DS2401 OW GND
U3 2 1 6 5
DS9503 OW GND
U4 1
Female RJ11
2
1 2 3 4 5 6
J2
DS9490R
iButton Socket 1 2
J3
DS9490B
5 of 5

▲Up To Search▲

Price & Availability of DS9490

	To Download DS9490 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .