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
Two 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
Operating Range: 2.9V to 5.5V, -40°C to +85°C
8-Pin (150 mils) SO and 8-Bump WLP Packages
DS2482-100 Applications
Cell Phones/PDAs
Industrial Sensors
Medical Instruments
Printers
DS2482-100 Description
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.
