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PDF DS2482-800 Data sheet ( Hoja de datos )
| Número de pieza | DS2482-800 | |
| Descripción | 8-Channel 1-Wire Master | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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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
1 page  
Figure 1. Block Diagram
DS2482-800: 8-Channel 1-Wire Master
SDA
SCL
AD0
AD1
AD2
T-Time OSC
Config
Register
I²C
Interface
Controller
I/O
Controller
Status
Register
Read Data
Register
Channel
Select
Line
XCVR
Line
XCVR
Line
XCVR
Line
XCVR
Line
XCVR
Line
XCVR
Line
XCVR
Line
XCVR
IO0
IO1
IO2
IO3
IO4
IO5
IO6
IO7
DETAILED DESCRIPTION
The DS2482-800 is a self-timed 8-channel 1-Wire master, which supports advanced 1-Wire waveform features
including standard and Overdrive speeds, active pullup, and strong pullup for power delivery. Once supplied with
command and data, the I/O controller of the DS2482 performs time-critical 1-Wire communication functions such as
reset/presence detect cycle, read-byte, write-byte, single-bit R/W and triplet for ROM Search, without requiring
interaction with the host processor. The host obtains feedback (completion of a 1-Wire function, presence pulse,
1-Wire short, search direction taken) through the Status Register and data through the Read Data register. The
DS2482 communicates with a host processor through its I2C bus interface in standard-mode or in fast-mode. The
logic state of three address pins (2 address pins with the 1-channel version) determines the I2C slave address of
the DS2482, allowing up to 8 devices operating on the same bus segment without requiring a hub.
DEVICE REGISTERS
The DS2482 has four registers that the I2C host can read: Channel Selection, Configuration, Status, and Read
Data. These registers are addressed by a read pointer. The position of the read pointer, i.e., the register that the
host will read in a subsequent read access, is defined by the instruction that the has DS2482 executed last. The
host has read and write access to the Channel Selection and Configuration Registers to select one of several
1-Wire channels and to enable certain 1-Wire features.
5 of 23
5 Page 
DS2482-800: 8-Channel 1-Wire Master
Channel Select
Command Code
Command Parameter
Description
Typical Use
Restriction
Error Response
Command Duration
1-Wire Activity
Read Pointer Position
Status Bits Affected
Configuration Bits Affected
C3h
Selection Code
Sets the 1-Wire IO channel for subsequent 1-Wire communication
commands. NOTE: The selection code read back is different from the
code written. See the table below for the respective values.
Selecting a 1-Wire IO channel other that IO0; randomly selecting one of
the available 1-Wire IO channels.
1-Wire activity must have ended before the DS2482 can process this
command.
Command code and parameter will not be acknowledged if 1WB = 1 at the
time the command code is received and the command will be ignored.
If the selection code is not valid, the selection code will not be
acknowledged and the command will be ignored.
None; the channel selection register is updated on the rising SCL edge of
the selection code acknowledge bit.
None
Channel Selection Register (to verify write)
None
None
Valid Channel Selection Codes
Channel Selection
Channel IO0 (default)
Channel IO1
Channel IO2
Channel IO3
Channel IO4
Channel IO5
Channel IO6
Channel IO7
Code (to be written)
F0h
E1h
D2h
C3h
B4h
A5h
96h
87h
Code (read back)
B8h
B1h
AAh
A3h
9Ch
95h
8Eh
87h
Figure 4. 1-Wire Reset/Presence Detect Cycle
11 of 23
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| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet DS2482-800.PDF ] | |
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