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REV: 042208
DESCRIPTION
The DS18B20 digital thermometer provides 9-bit
to 12-bit Celsius temperature measurements and
has an alarm function with nonvolatile user-
programmable upper and lower trigger points.
The DS18B20 communicates over a 1-Wire bus
that by definition requires only one data line (and
ground) for communication with a central
microprocessor. It has an operating temperature
range of -55癈 to +125癈 and is accurate to
?.5癈 over the range of -10癈 to +85癈. In
addition, the DS18B20 can derive power directly
from the data line ( parasite power ), eliminating
the need for an external power supply.
Each DS18B20 has a unique 64-bit serial code,
which allows multiple DS18B20s to function on
the same 1-Wire bus. Thus, it is simple to use one
microprocessor to control many DS18B20s
distributed over a large area. Applications that
can benefit from this feature include HVAC
environmental controls, temperature monitoring
systems inside buildings, equipment, or
machinery, and process monitoring and control
systems.
FEATURES
? Unique 1-Wire?Interface Requires Only One
Port Pin for Communication
? Each Device has a Unique 64-Bit Serial Code
Stored in an On-Board ROM
? Multidrop Capability Simplifies Distributed
Temperature-Sensing Applications
? Requires No External Components
? Can Be Powered from Data Line; Power Supply
Range is 3.0V to 5.5V
? Measures Temperatures from -55癈 to +125癈
(-67癋 to +257癋)
? ?.5癈 Accuracy from -10癈 to +85癈
? Thermometer Resolution is User Selectable
from 9 to 12 Bits
? Converts Temperature to 12-Bit Digital Word in
750ms (Max)
? User-Definable Nonvolatile (NV) Alarm
Settings
? Alarm Search Command Identifies and
Addresses Devices Whose Temperature is
Outside Programmed Limits (Temperature
Alarm Condition)
? Available in 8-Pin SO (150 mils), 8-Pin 礢OP,
and 3-Pin TO-92 Packages
? Software Compatible with the DS1822
? Applications Include Thermostatic Controls,
Industrial Systems, Consumer Products,
Thermometers, or Any Thermally Sensitive
System
PIN CONFIGURATIONS
DS18B20
Programmable Resolution
1-Wire Digital Thermometer
TO-92
(DS18B20)
1 2 3
AXIM
18B20
1
2 3
SO (150 mils)
(DS18B20Z)
N. .
N.C.
N.C.
GND
DQ
V
DD
6
7
3
2
V
DD
N. .
N.C.
N. .
GND
N.C.
6
7
3
2
?SPAN class="pst DS18B20Z-T-R_2290795_6">SOP
(DS18B20U)
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
发布紧急采购，3分钟左右您将得到回复。
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