Single-Channel 1-Wire® Master with Sleep Mode

I²C-to-1-Wire Bridge Device performs bidirectional Protocol Conversion between I²C Master & 1-Wire Slave Device

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The DS2482-101 is an I2C-to-1-Wire bridge device that interfaces directly to standard (100kHz max) or fast (400kHz max) I2C masters to perform bidirectional protocol conversion between the I2C master and any downstream 1-Wire slave devices. Relative to any attached 1-Wire slave device, the DS2482-101 is a 1-Wire master. Internal, factory-trimmed timers relieve the system host processor from generating time-critical 1-Wire waveforms, supporting both standard and overdrive 1-Wire communication speeds. To optimize 1-Wire waveform generation, the DS2482-101 performs slew-rate control on rising and falling 1-Wire edges and provides additional programmable features to match drive characteristics to the 1-Wire slave environment. Programmable, strong pullup features support 1-Wire power delivery to 1-Wire devices such as EEPROMs and sensors. The DS2482-101 combines these features with an output to control an external MOSFET for enhanced strong pullup application. The I2C slave address assignment is controlled by one binary address input, resolving potential conflicts with other I2C slave devices in the system. When not in use, the device can be put in sleep mode where power consumption is minimal.
DS2482-101: Typical Operating Circuit DS2482-101: Typical Operating Circuit Enlarge+

Key Features

  • Allows Easy Interface Between a I2C Microport and a 1-Wire Slave
    • I2C Host Interface Supports 100kHz and 400kHz I2C Communication Speeds
    • 1-Wire Master IO with Selectable Active or Passive 1-Wire Pullup
    • Provides Reset/Presence, 8-Bit, Single-Bit, and 3-Bit 1-Wire IO Sequences
    • Standard and Overdrive 1-Wire Communication Speeds
    • One Address Inputs for I2C Address Assignment
  • Minimizes Line Noise Reducing System EMI
    • Slew-Controlled 1-Wire Edges
  • Supports EEPROMs, Temperature Sensors, or other 1-Wire Slaves That Have Momentary High Source Current Modes
    • Strong 1-Wire Pullup Provided by an Internal Low-Impedance Signal Path
    • PCTLZ Output to Optionally Control an External MOSFET for Stronger Pullup Requirements
    • Reduce Power Consumption Saves on Power Supply Cost
    • Supports Power-Saving Sleep Mode
  • Operating Range: 2.9V to 5.5V, -40°C to +85°C
  • 9-Bump WLP Package


  • Cell Phones/PDAs
  • Industrial Sensors
  • Medical Instruments
  • Printers

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: DS2482-101.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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