DS2482-101 Datasheet

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Package Description

• 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
  • One 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
  • Reduce Power Consumption Saves on Power Supply Cost
  • Supports Power-Saving Sleep Mode
• Operating Range: 2.9V to 5.5V, -40°C to +85°C
• 9-Bump WLP Package

• Cell Phones/PDAs
• Industrial Sensors
• Medical Instruments
• Printers

The DS2482-101 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 DS2482-101 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 DS2482-101 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 DS2482-101 combines these features with an output to control an external MOSFET for enhanced strong pullup application. The I²C slave address assignment is controlled by one binary address input, resolving potential conflicts with other I²C slave devices in the system. When not in use, the device can be put in sleep mode where power consumption is minimal.