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DS2482-800：8-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

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.

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)

DS2482-800: Typical Operating Circuit Applications/Uses Central Office Switches Medical Clinical Diagnostic Equipment PBXs Rack-Based Servers Wireless Base Stations

DataSheet

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Quality and Environmental Data

• DS2482-800.pdf

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