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Advanced 1-Wire® Master with Memory

Best-in-Class 1-Wire Master Performs Protocol Conversion Between the I2C Master and 1-Wire Slaves

Product Details

Key Features

Parametric specs for 1-Wire Interface Products
Functions 1-Wire Bridge
VSUPPLY (V) 2.2-3.63V
Package/Pins TDFN/6
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
1
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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) 2.2-3.63V
Package/Pins TDFN/6
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
1

Key Features

  • I2C Communication, up to 1MHz
  • 1-Wire Standard and Overdrive Timing Communication Speeds
  • 1-Wire Command Scripting Capability
  • Adjustable 1-Wire Timing for tRSTL, tMSI, tMSP, tRSTH, tW0L, tW1L, tMSR, tREC, RPUP, and PDSLEW
  • 0.75Kb of EEPROM for User Data
  • One Open-Drain GPIO Pin
  • Large 1-Wire Block Buffer (126 Bytes) for Efficient Data Transfer
  • Operating Range: 2.97V to 3.63V, -40°C to +85°C
  • 3mm x 3mm, 6-Pin TDFN-EP Package

Applications/Uses

  • Industrial Sensors and Tools
  • Limited-Use Consumables
  • Medical Instruments
  • Printer Cartridge Identification

Description

The DS2485 is a 1-Wire® master that performs protocol conversion between the I2C master and any attached 1-Wire slaves. For 1-Wire line driving, internal user-adjustable timers relieve the system host processor from generating time-critical 1-Wire waveforms, supporting both standard and overdrive 1-Wire communication speeds. The 1-Wire master has selectable active or passive 1-Wire pullup. Strong pullup features support 1-Wire power delivery for 1-Wire devices that require this for EEPROMs and cryptographic computations.

Simplified Block Diagram

DS2485: Typical Application Circuit DS2485: Typical Application Circuit Zoom icon

Technical Docs

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 .