DS2482-800
Eight-Channel 1-Wire Master
www.maxim-ic.com
GENERAL DESCRIPTION
FEATURES
ꢀ
Cꢀ I²C Host Interface, Supports 100kHz and 400kHz
I²C Communication Speeds
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.
Cꢀ 1-Wire Master I/O with Selectable Active or
Passive 1-Wire Pullup
Cꢀ Provides Reset/Presence, 8-Bit, Single-Bit, and
Three-Bit 1-Wire I/O Sequences
Cꢀ Eight Channels of Independently Operated
1-Wire I/O
Cꢀ Standard and Overdrive 1-Wire Communication
Speeds
Cꢀ Slew Controlled 1-Wire Edges
Cꢀ Selectable 1-Wire Slave Presence Pulse Falling
Edge Masking to Control Fast Edges on the
1-Wire Line
Cꢀ Supports Low-Impedance 1-Wire Strong Pullup
for EEPROMs, Temp Sensors, or Other 1-Wire
Slaves That Have Momentary High Current
Modes
Cꢀ Three Address Inputs for I²C Address
Assignment
Cꢀ Wide Operating Range: 2.9V to 5.5V, -40°C to
+85°C
Cꢀ 16-Pin SO Package (150 mil)
ORDERING INFORMATION
APPLICATIONS
PART
TEMP RANGE
-40 to +85LC
-40 to +85LC
PIN-PACKAGE
16 SO (150 mil )
16 SO (150 mil )
Cꢀ Wireless Base Stations
Cꢀ Central Office Switches
Cꢀ PBXs
DS2482S-800
DS2482S-800/T&R
Cꢀ Rack-Based Servers
Cꢀ Medical Clinical Diagnostic Equipment
PIN CONFIGURATION
IO3
SCL
SDA
VDD
NC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
IO2
IO1
IO0
GND
IO4
IO5
IO6
IO7
TYPICAL OPERATING CIRCUIT
VCC
1-Wire
RP
Device #1
1-Wire lines
Rt
SDA
SCL
IO0
IO1
IO2
IO3
IO4
IO5
IO6
IO7
(I²C port)
1-Wire
Device #2
µC
AD2
AD1
AD0
AD0
AD1
AD2
DS2482 800
I2C is a trademark of Philips Corp. Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated
Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system
conforms to the I2C Standard Specification as defined by Philips.
1-Wire is a registered trademark of Dallas Semiconductor.
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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