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Technical content
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 i Button® 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 i Button hardware. iButton Initialization and Download— Loggers like the Thermochron® can be missioned and downloaded. Monetary i Buttons 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
ORDERING INFORMATION
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 anti-static bag.
DESCRIPTION
The DS9490B is a USB bridge a nd holder for a single F5-size i Button. 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 ® operating systems can be found on the i Button website under software support at www.maxim-ic.com/products/ibutton/software/tmex/index.cfm. DS9490R/DS9490B USB to 1-Wire/iButton Adapter www.maxim-ic.com 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. 19-4881; Rev 8/09
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
5 SUSO USB Suspend Output
Figure 5. iButton SOCKET FOR DS9490B
1 OW 1-Wire Data
2 GND_OW 1-Wire Return
paper clip, 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 ac tive mode and 0.5mA in suspend mode*. The DS9490R has the V BUS power and ground available on the RJ11 c onnector. In active mode the current available to an externally powered fixture is 42m A* (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 pres ence of this signal with the particular adapter. *Guaranteed by design, not production tested. **Tested at DS2490 component level. Figure 8. FUNCTIONAL DIAGRAM
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. Maxim Integrated Products, 120 San Ga briel Drive, Sunnyvale, CA 94086 408-737-7600 © 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
REVISION HISTORY
8/09 Removed references to leaded packages in the Ordering Information table. 1