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Numéro de référence | DS2482-800 | ||
Description | 8-Channel 1-Wire Master | ||
Fabricant | Maxim Integrated | ||
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1 Page
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
BENEFITS AND FEATURES
• Allows Easy Interface Between an I2C Micro Port
and a 1-Wire Slave
o I2C Host Interface Supports 100kHz and
400kHz I2C Communication Speeds
o 8 Channels of Independently Operated
1-Wire I/O
o 1-Wire Master I/O with Selectable Active or
Passive 1-Wire Pullup
o Provides Reset/Presence, 8-Bit, Single-Bit,
and 3-Bit 1-Wire I/O Sequences
o Standard and Overdrive 1-Wire
Communication Speeds
o Three Address Inputs for I2C Address
Assignment
• Minimizes Line Noise, Reducing System EMI
o Slew-Controlled 1-Wire Edges
• Supports EEPROMs, Temp Sensors, or Other
1-Wire Slaves That Have Momentary High Source
Current Modes
o Strong 1-Wire Pullup Provided by an
Internal Low-Impedance Signal Path
o PCTLZ Output to Optionally Control an
External MOSFET for Stronger Pullup
Requirements
• 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
19-4932; Rev 5; 12/14
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Pages | Pages 23 | ||
Télécharger | [ DS2482-800 ] |
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