DS2482-100 Datasheet, PDF (1/21 Pages) Dallas Semiconductor – Single-Channel 1-Wire Master

DS2482-100
Single-Channel 1-Wire Master
www.maxim-ic.com
GENERAL DESCRIPTION
The DS2482-100 is an I²Cä to 1-Wire^Ò 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
DS2482-100 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 DS2482-100 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 DS2482-100 combines these
features with an output to control an external
MOSFET for enhanced strong pullup application. The
I²C slave address assignment is controlled by two
binary address inputs, resolving potential conflicts
with other I²C slave devices in the system.
APPLICATIONS
§ Printers
§ Medical Instruments
§ Industrial Sensors
§ Cell Phones, PDAs
TYPICAL OPERATING CIRCUIT
VCC
(I²C port)
µC
*RP
SDA
SCL
PCTLZ
DS2482-100
AD0
AD1
*Rt
IO
Current Limiting
Resistor
Optional
circuitry
1-Wire line
1-Wire
Device
1-Wire
Device
1-Wire
Device
FEATURES
§ I²C Host Interface, Supports 100kHz and 400kHz
I²C Communication Speeds
§ 1-Wire Master IO with Selectable Active or
Passive 1-Wire Pullup
§ Provides Reset/Presence, 8-Bit, Single-Bit, and
Three-Bit 1-Wire IO Sequences
§ 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
§ 2 Address Inputs for I²C Address Assignment
§ Wide Operating Range: 2.9V to 5.5V, -40°C to
+85°C
§ 8-Pin, 150-mil SO Package
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
DS2482S-100
-40 to +85°C 8 SO (150 mil)
DS2482S-100/T&R -40 to +85°C 8 SO (150 mil)
PIN CONFIGURATION
VCC
1
8
IO
2
7
GND
3
6
SCL
4
5
AD0
AD1
PCTLZ
SDA
I²C is a trademark of Philips Corp. Purchase of I²C components of Maxim Integrated Products, Inc., or one of its 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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