DS2482-800_12 Datasheet, PDF (1/23 Pages) Maxim Integrated Products – 8-Channel 1-Wire Master

19-4932; Rev 4; 1/12
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
bidirectional 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
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
DS2482-800
8-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
 8 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 mils)
ORDERING INFORMATION
PART
TEMP
RANGE
PIN-
PACKAGE
DS2482S-800+
-40 to +85C 16 SO
DS2482S-800+T&R -40 to +85C 16 SO
+Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
PIN CONFIGURATION
IO3
1
16
IO2
SCL
2
15
IO1
SDA
3
14
IO0
VCC
4
13
GND
NC
5
12
IO4
AD2
6
11
IO5
AD1
7
10
IO6
AD0
8
9
IO7
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