GENERAL DESCRIPTION
The DS2482-800 is an I 2 C-to-1-Wire bridge device that interfaces directly to standard (100kHz max) or fast (400kHz max) I 2 C masters to perform bidirectional protocol conversion between the I 2 C 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
BENEFITS AND FEATURES
Allows Easy Interface Between an I2 C Micro Port and a 1-Wire Slave o I 2 C Host Interface Supports 100kHz and 400kHz I 2 C Communication Speeds o 8 Channels of Independently Operated 1-Wire I/O o 1-Wire Master I/O with Selectable Active or Passive 1-Wire Pullup o Provides Reset/Presence, 8-Bit, Single-Bit, and 3-Bit 1-Wire I/O Sequences o Standard and Overdrive 1-Wire Communication Speeds o Three Address Inputs for I2 C Address Assignment
Minimizes Line Noise, Reducing System EMI o Slew-Controlled 1-Wire Edges Supports EEPROMs, Temp Sensors, or Other 1-Wire Slaves That Have Momentary High Source Current Modes o Strong 1-Wire Pullup Provided by an Internal Low-Impedance Signal Path o 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)
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 I2 C slave address assignment is controlled by three binary address inputs, resolving potential conflicts with other I 2 C slave devices in the system.
APPLICATIONS
Wireless Base Stations Central Office Switches PBXs Rack-Based Servers Medical Clinical Diagnostic Equipment
