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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

Product Details

Key Features

Parametric specs for 1-Wire Interface Products
Functions 1-Wire Bridge
VSUPPLY (V) 2.9 to 5.5
Package/Pins SOIC (N)/16
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
4.4
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Simplified Block Diagram

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Parameters

Parametric specs for 1-Wire Interface Products
Functions 1-Wire Bridge
VSUPPLY (V) 2.9 to 5.5
Package/Pins SOIC (N)/16
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
4.4

Key Features

  • 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
    • PCTLZ Output to Optionally Control an External MOSFET for Stronger Pullup Requirements
  • Wide Operating Range: 2.9V to 5.5V, -40°C to +85°C
  • 16-Pin SO Package (150 mils)

Applications/Uses

  • Central Office Switches
  • Medical Clinical Diagnostic Equipment
  • PBXs
  • Rack-Based Servers
  • Wireless Base Stations

Description

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.

Simplified Block Diagram

DS2482-800: Typical Operating Circuit DS2482-800: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .