19-4931; Rev 2; 11/09
Single-Channel 1-Wire Master with Sleep Mode
DS482-01
General Description
Features
♦ I C Host Interface Supports 100kHz and 400kHz
2
®
2
2
The DS2482-101 is an I C-to-1-Wire bridge device
that interfaces directly to standard (100kHz max) or fast
I C Communication Speeds
2
(400kHz max) I C masters to perform bidirectional pro-
♦ 1-Wire Master IO with Selectable Active or
2
tocol conversion between the I C master and any
Passive 1-Wire Pullup
downstream 1-Wire slave devices. Relative to any
attached 1-Wire slave device, the DS2482-101 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 DS2482-101 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 DS2482-101 combines these features
with an output to control an external MOSFET for
♦ Provides Reset/Presence, 8-Bit, Single-Bit, and
3-Bit 1-Wire IO Sequences
♦ Standard and Overdrive 1-Wire Communication
Speeds
♦ Slew-Controlled 1-Wire Edges
♦ Strong 1-Wire Pullup Provided by an Internal Low-
Impedance Signal Path
♦ PCTLZ Output to Optionally Control an External
MOSFET for Stronger Pullup Requirements
♦ Supports Power-Saving Sleep Mode
2
enhanced strong pullup application. The I C slave
2
♦ One Address Input for I C Address Assignment
address assignment is controlled by one binary
address input, resolving potential conflicts with other
♦ Operating Range: 2.9V to 5.5V, -40°C to +85°C
♦ 8-Pin (150 mils) SO and 9-Bump WLP Packages
2
I C slave devices in the system. When not in use, the
device can be put in sleep mode where power con-
sumption is minimal.
Ordering Information
Applications
Industrial Sensors
PART
TEMP RANGE PIN-PACKAGE
DS2482S-101+
-40°C to +85°C 8 SO (150 mils)
Printers
DS2482S-101+T&R -40°C to +85°C 8 SO (150 mils)
DS2482X-101+T -40°C to +85°C 9 WLP (2.5k pieces)
Medical Instruments
Cell Phones, PDAs
+Denotes a lead(Pb)-free/RoHS-compliant package.
T/T&R = Tape and reel.
Pin Configurations appear at end of data sheet.
Typical Operating Circuit
V
CC
CURRENT-LIMITING
RESISTOR
R *
P
REFER TO APPLICATION
NOTE 4206
SDA
SCL
2
(I C PORT)
PCTLZ
OPTIONAL
CIRCUITRY
μC
DS2482-101
1-Wire LINE
SLPZ
AD0
IO
1-Wire
DEVICE
1-Wire
DEVICE
1-Wire
DEVICE
2
*R = I C PULLUP RESISTOR (SEE THE APPLICATIONS INFORMATION SECTION FOR R SIZING).
P
P
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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