Rainbow Electronics DS2482-800 - Manual

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GENERAL DESCRIPTION
The DS2482-800 is an I²C™ to 1-Wire â 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
(I²C port)
µC
DS2482 800
1-Wire lines R t
R P
IO0
IO1
IO2
IO3
IO4
IO5
IO6
IO7
AD0
AD1
AD2
SDA
SCL
V CC
1-Wire
Device #1
1-Wire
Device #2
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
§ Selectable 1-Wire Slave Presence Pulse Falling
Edge Masking to Control Fast Edges on the
1-Wire Line
§ 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 )
PIN CONFIGURATION
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
IO2
IO1
IO0
GND
IO4
IO5
IO6
IO7
IO3
SCL
SDA
VDD
NC
AD2
AD1
AD0
DS2482-800
Eight-Channel 1-Wire Master
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I 2 C is a trademark of Philips Corp. Purchase of I 2 C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated
Companies, conveys a license under the Philips I 2 C Patent Rights to use these components in an I 2 C system, provided that the system
conforms to the I 2 C Standard Specification as defined by Philips.
1-Wire is a registered trademark of Dallas Semiconductor.