8-Channel 1-Wire Master

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


The DS2482-800 is an I²C to 1-Wire® bridge device that interfaces directly to standard (100kHz max) or fast (400kHz max) I²C masters to perform bi-directional protocol conversion between the I²C master and any downstream 1-Wire slave devices. Relative to any attached 1-Wire slave device, the DS2482-800 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 DS2482-800 performs slew-rate control on rising and falling 1-Wire edges and has a programmable feature to mask the fast presence pulse edge that some 1-Wire slave devices can generate. Programmable strong pullup features support 1-Wire power delivery to 1-Wire devices such as EEPROMs and sensors. The DS2482-800 combines these features with eight independent 1-Wire I/O channels. The I²C slave address assignment is controlled by three binary address inputs, resolving potential conflicts with other I²C slave devices in the system.
DS2482-800: Typical Operating Circuit DS2482-800: Typical Operating Circuit Enlarge+

Key Features

  • I²C Host Interface, Supports 100kHz and 400kHz I²C Communication Speeds
  • 1-Wire Master I/O with Selectable Active or Passive 1-Wire Pullup
  • Provides Reset/Presence, 8-Bit, Single-Bit, and Three-Bit 1-Wire I/O Sequences
  • 8 Channels of Independently Operated 1-Wire I/O
  • Standard and Overdrive 1-Wire Communication Speeds
  • Slew Controlled 1-Wire Edges
  • Supports Low-Impedance 1-Wire Strong Pullup for EEPROMs, Temp Sensors, or Other 1-Wire Slaves That Have Momentary High Current Modes
  • Three Address Inputs for I²C Address Assignment
  • Wide Operating Range: 2.9V to 5.5V, -40°C to +85°C
  • 16-Pin SO Package (150 mils)


  • Central Office Switches
  • Medical Clinical Diagnostic Equipment
  • PBXs
  • Rack-Based Servers
  • Wireless Base Stations
Part Number Functions VSUPPLY
See Notes
DS2482-800  1-Wire Bridge 2.9 to 5.5 $3.95 @1k
See All 1-Wire Interface Products (7)
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.


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