DS2482-100

` 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 Three-Bit 1-Wire IO Sequences
` Standard and Overdrive 1-Wire Communication Speeds
` Slew Controlled 1-Wire Edges
` Selectable 1-Wire Slave Presence-Pulse Falling Edge Masking to Control Fast Edges on the 1-Wire Line
` Supports Low-Impedance 1-Wire Strong Pullup for EEPROMs, Temp Sensors, or Other 1-Wire Slaves that have Momentary High Current Modes
`  2 Address Inputs for I²C Address Assignment
`  Wide Operating Range: 2.9V to 5.5V, -40 to +85
`  8-Pin, 150-mil SO Package

·  Printers
·  Medical Instruments
·  Industrial Sensors
·  Cell Phones, PDAs

Voltage Range on Any Pin Relative to Ground ...........................-0.5V, +6V
Maximum Current into Any Pin ........................................................+ 20mA
Operating Temperature Range ...........................................-40 to +85
Junction Temperature ...................................................................+150°
Storage Temperature Range ............................................-55 to +125
Soldering Temperature ....................................See IPC/JEDEC J-STD-020A

Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those ndicated in the operational sections of the specifications is not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device.

The DS2482-100 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 DS2482-100 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 DS2482-100 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 DS2482-100 combines these features with an output to control an external MOSFET for enhanced strong pullup application. The I²C slave address assignment is controlled by two binary address inputs, resolving potential conflicts with other I²C slave devices in the system.