DS2482-100

Single-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 Device


Description

The DS2482-100 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 DS2482-100 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 DS2482-100 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 DS2482-100 combines these features with an output to control an external MOSFET for enhanced strong pullup application. The I²C slave address assignment is controlled by two binary address inputs, resolving potential conflicts with other I²C slave devices in the system.
DS2482-100: Typical Operating Circuit DS2482-100: 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
    • Two 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
  • Operating Range: 2.9V to 5.5V, -40°C to +85°C
  • 8-Pin (150 mils) SO and 9-Bump WLP Packages

Applications/Uses

  • Cell Phones/PDAs
  • Industrial Sensors
  • Medical Instruments
  • Printers
Part Number Functions VSUPPLY
(V)
Package/Pins Oper. Temp.
(°C)
Budgetary
Price
See Notes
DS2482-100  1-Wire Bridge 2.9 to 5.5
SOIC(N)/8
WLP/9
-40 to +85 $0.74 @1k
See All 1-Wire Interface Products (9)
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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