DS2482-100_15 Datasheet, PDF (1/24 Pages) Maxim Integrated Products – Single-Channel 1-Wire Master

DS2482-100
Single-Channel 1-Wire Master
General 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 pro-
tocol 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 over-
drive 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.
Applications
Printers
Medical Instruments
Industrial Sensors
Cell Phones, PDAs
Benefits and Features
• 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 9-Bump WLP Packages
Pin Configurations and Ordering Information appear at end
of data sheet.
Typical Operating Circuit
V_CC
(I²C PORT)
µC
R_P*
SDA
SCL
PCTLZ
DS2482-100
AD0
IO
AD1
CURRENT-LIMITING
RESISTOR
REFER TO APPLICATION
NOTE 4206
OPTIONAL
CIRCUITRY
1-Wire LINE
1-Wire
DEVICE
1-Wire
DEVICE
1-Wire
DEVICE
*R_P = I²C PULLUP RESISTOR (SEE THE APPLICATIONS INFORMATION SECTION FOR R_P SIZING).
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
19-4930; Rev 10; 1/15