8-Channel 1-Wire Master

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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

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Part Details
Part Models 2
1ku List Price Starting From $5.70
  • Allows Easy Interface Between an I2C Micro Port and a 1-Wire Slave
    • I2C Host Interface Supports 100kHz and 400kHz I2C Communication Speeds
    • 8 Channels of Independently Operated 1-Wire I/O
    • 1-Wire Master I/O with Selectable Active or Passive 1-Wire Pullup
    • Provides Reset/Presence, 8-Bit, Single-Bit, and 3-Bit 1-Wire I/O Sequences
    • Standard and Overdrive 1-Wire Communication Speeds 2
    • Three Address Inputs for I2C Address Assignment
  • Minimizes Line Noise, Reducing System EMI
    • Slew-Controlled 1-Wire Edges
  • Supports EEPROMs, Temp 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
  • Wide Operating Range: 2.9V to 5.5V, -40°C to +85°C
  • 16-Pin SO Package (150 mils)
Additional Details
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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.


  • Central Office Switches
  • Medical Clinical Diagnostic Equipment
  • PBXs
  • Rack-Based Servers
  • Wireless Base Stations
Part Models 2
1ku List Price Starting From $5.70

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Evaluation Kit

Evaluation Kits 1


Evaluation Kit for the DS28EA00



Evaluation Kit for the DS28EA00

Evaluation Kit for the DS28EA00

Features and Benefits

  • Easy Setup
  • Stand-Alone EV Board
    • Contains Three Separate, Breakable Subsections with a DS28EA00 Per Subsection
    • The Dipswitch Block on Each EV Board Subsection Routes Physical Chain-Mode
    • Connections Between Chips When Used as a Stand-Alone Board
    • EV Board's Subsections are Breakable Into Three Separate Boards Each of Which Evaluates a Single DS28EA00 or, When Cabled Together, Evaluate Chain-Mode Searching
    • LEDs Give Visual Indicators of PIO Activity
    • 6-Pin Terminal Strip Allows PIO Testing Outside of Chain Mode
  • PC Connectivity Included
  • RoHS Compliant
  • Free Downloadable Evaluation Software Available

Product Detail

The DS28EA00 evaluation system (EV system) consists of a single evaluation kit (EV kit) that includes an evaluation board (EV board) made up of three subsections that can be broken/snapped off into three independently exercisable boards. See Figure 1 (in the full data sheet) for a picture of the standalone EV board and Figure 2 (in the full data sheet) for a picture of the EV board snapped and cabled together. Three DS28EA00 temperature chips with GPIO and sequence detect can be found on the EV board, one per subsection. Also included in the kit are connectivity items, such as serial cables, a 1-Wire® USB adapter, and jumpers. Free evaluation software, the OneWireViewer, is available for download from the web page listed in the Support Resources (in the full data sheet) section.

Since one of the major features of the DS28EA00 is detection of physical sequence, a block of dip switches are provided on each subsection of the EV board to re-order the physical connection between the chips. Optionally, the customer can break off the subsections of the eval board, connect them together with the provided cables, and re-order the physical sequence of the DS28EA00s that way. The OneWireViewer evaluation software can then be used to exercise the functionality of the chips and provide a way for an evaluator to see the actual physical connection sequence of the chips. The algorithm to detect the connection order is called chain mode. More information on chain mode can be found in Application Note 4037.


  • Any Rack-Based Electronic System
  • Climate Control
  • Data communication equipment
  • Process Temperature Monitoring
  • Servers
  • Wireless Basestations

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