USB to 1-Wire Bridge Chip

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Status Explanations for product status codes

Part Number Status Explanation
DS2490 This product is Not Recommended for New Designs. Some versions may be No Longer Available or being discontinued and subject to Last Time Buy, after which new orders can not be placed. See Ordering Information for details. The DS2490 remains available but is not recommended for new designs. The DS2480B and DS2482S-100 alternatively provide either UART/RS-232 or I²C to 1-Wire interface solutions. 


The DS2490 is a bridge chip that enables communication between a USB host system and a 1-Wire® bus. It provides regular, overdrive, and flexible 1-Wire communication speeds and a full-speed 12Mbps connection to USB. USB vendor-specific commands defined in this specification are used to control the DS2490 and communicate with attached 1-Wire devices. A functional block diagram of the DS2490 is shown in Figure 1 of the full data sheet.

Data Sheet

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Key Features

  • Communicates at regular and overdrive 1-Wire speeds
  • Supports stiff 5V pullup for EEPROM, sensors, and crypto iButton®
  • Slew rate controlled 1-Wire timing and active pullup to accommodate long 1-Wire network lines and reduce radiation
  • Programmable 1-Wire timing and driver characteristics accommodate a wide range of 1-Wire network configurations
  • Low- to high-level command types, including macros, for generating 1-Wire communication
  • Crystal oscillator timebase provides precision timed 1-Wire waveforms
  • High-speed 12Mbps Universal Serial Bus (USB) interface
  • Integrated USB-compliant transceiver
  • Supports USB remote wake-up from a 1-Wire device event to resume a suspended host system
  • 0°C to +70°C operating temperature range

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Document Ref.: 19-4993 Rev 4; 2009-11-04
This page last modified: 2009-11-04