DS9490R/DS9490B USB to 1-Wire/iButton Adapters FEATURES TYPICAL OPERATING CIRCUIT High-Speed 12Mbps Universal Serial Bus (USB) Interface USB PC Supports Standard and Overdrive 1-Wire DS9490B iButton Communication Slew-Rate-Controlled 1-Wire Timing and Active Pullup for Improved 1-Wire Network Performance DS9490R has an RJ11 Interface for USB PC DS9490R Standard Connectivity Accessories such as the DS1402D-DR8 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. ORDERING INFORMATION Writes All Except EPROM 1-Wire/iButton PART TYPE Devices USB Single F5 iButton Holder DS9490B with Protective Cap APPLICATIONS DS9490R USB-to-1-Wire RJ11 Software AuthorizationProtection against Denotes a RoHS-compliant device that may include lead(Pb) that is exempt under the RoHS requirements. software piracy by tying software operation to the presence of iButton hardware. PACKAGING/SHIPPING iButton Initialization and DownloadLoggers like the Thermochron can be missioned and INFORMATION Functional Diagrams downloaded. The part is shipped individually in an antistatic DemonstrationDemonstrate the features of bag. iButtons or 1-Wire chips on personal computers. DevelopmentAid development of 1-Wire applications by providing a PC interface to verify device contents and state. 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 SBU bridge with -1Wire RJ11 interface to accommodate 1-Wire receptacles and networks. For a list of suitable -1Wire 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 ch ipF.ree software drivers for Windo-bwassed PC scan be downloaded from www.maxim-ic.com/1-Wiredrivers. Pin Configurations appear at end of data sheet. Functional Diagrams continued at end of data sheet. 1-WiUCSP is a trademark of Maxim Integrated Products, Inc.re, iButton, and Thermochron are registered trademarks of Maxim Integrated Products, Inc. Windows is a registered trademark of Microsoft Corp. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim integrated.com. 19-4881 Rev 6/11 AVAILABLEDS9490R/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 thie Button. 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 12-BIT 36-BIT SERIAL 8-BIT 8-BIT FAMILY FIXED NUMBER CRC CODE CODE (81h) (000h) MSB LSB MSB LSB MSB LSB MSB LSB 2 of 6