DS2482-800 Datasheet, PDF (1/23 Pages) Dallas Semiconductor – Eight-Channel 1-Wire Master

19-4932; 11/09
www.maxim-ic.com
GENERAL DESCRIPTION
The DS2482-800 is an I²C to 1-Wire^ bridge device
that interfaces directly to standard (100kHz max) or
fast (400kHz max) I²C masters to perform bi-
directional protocol conversion between the I²C
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-
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 I²C slave address assignment
is controlled by three binary address inputs, resolving
potential conflicts with other I²C slave devices in the
system.
APPLICATIONS
 Wireless Base Stations
 Central Office Switches
 PBXs
 Rack-Based Servers
 Medical Clinical Diagnostic Equipment
TYPICAL OPERATING CIRCUIT
DS2482-800
Eight-Channel 1-Wire Master
FEATURES
 I²C Host Interface, Supports 100kHz and 400kHz
I²C Communication Speeds
 1-Wire Master I/O with Selectable Active or
Passive 1-Wire Pullup
 Provides Reset/Presence, 8-Bit, Single-Bit, and
Three-Bit 1-Wire I/O Sequences
 Eight Channels of Independently Operated
1-Wire I/O
 Standard and Overdrive 1-Wire Communication
Speeds
 Slew Controlled 1-Wire Edges
 Supports Low-Impedance 1-Wire Strong Pullup
for EEPROMs, Temp Sensors, or Other 1-Wire
Slaves That Have Momentary High Current
Modes
 Three Address Inputs for I²C Address
Assignment
 Wide Operating Range: 2.9V to 5.5V, -40°C to
+85°C
 16-Pin SO Package (150 mil)
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
DS2482S-800+
-40 to +85C 16 SO (150 mil )
DS2482S-800+T&R -40 to +85C 16 SO (150 mil )
+Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
PIN CONFIGURATION
IO3
1
SCL
2
SDA
3
VCC
4
NC
5
AD2
6
AD1
7
AD0
8
16
IO2
15
IO1
14
IO0
13
GND
12
IO4
11
IO5
10
IO6
9
IO7
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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