8-Channel 1-Wire Master

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.

Applications

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

* 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

* Wide Operating Range: 2.9V to 5.5V, -40°C to +85°C

* 16-Pin SO Package (150 mils)