DS9490B DALLAS | Alldatasheet
Document overview
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Technical content
FEATURES
/g167 High-Speed 12Mbps Universal Serial Bus (USB) Interface /g167 Supports Standard and Overdrive 1-Wire® Communication /g167 Slew-Rate-Controlled 1-Wire Timing and Active Pullup for Improved 1-Wire Network Performance /g167 DS9490R has an RJ11 Interface for Standard Connectivity Accessories such as the DS1402D-DR8 /g167 DS9490B has an iButton ® Interface and Retains a Fixed iButton /g167 Built-In Custom DS2401 Identification Chip /g167 Reads all 1-Wire and iButton Devices. Writes All Except EPROM 1-Wire/iButton Devices
APPLICATIONS
/g167 Software Authorization—Protection against software piracy by tying software operation to the presence of iButton hardware. /g167 iButton Initialization and Download— Loggers like the Thermochron® can be missioned and downloaded. Monetary iButtons can be refilled with money. /g167 Demonstration—Demonstr ate the features of iButtons or 1-Wire chips on personal computers. /g167 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
DS9490B USB Single F5 iButton Holder with Protective Cap DS9490R 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 i Button 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 can be found on the iButton website under software support at: http://www.ibutton.com/software/tmex/index.html DS9490R/DS9490B USB to 1-Wire/iButton Adapter www.maxim-ic.com 1-Wire, iButton, and Thermochron are registered trademarks of Dallas Semiconductor. Blue Dot is a trademark of Dallas Semiconductor. Windows is a re gistered trademark of Micosoft Corp.
Figure 4. 1-WIRE RJ11 SOCKET FOR DS9490R
1 VDD 5VDC Output
2 GND Power Ground
3 OW 1-Wire Data
4 GND_OW 1-Wire Return
Figure 5. iBUTTON SOCKET FOR DS9490B
1 OW 1-Wire Data
2 GND_OW 1-Wire Return
swinging it fully open, and sliding out the hinge.
ELECTRICAL CHARACTERISTICS
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 V BUS 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 m ode there is zero current available to an external circuit. An external circuit cannot detect when the module is in su spend or active mode. Consequently, when in suspend mode, the DS9490R module with external circuit combination is in violation of the USB power specification. Application de velopers 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