DS18S20 Datasheet, PDF (1/23 Pages) Dallas Semiconductor – High Precision 1-Wire Digital Thermometer

AVAILABLE
DS18S20
High-Precision 1-Wire Digital Thermometer
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°C to
+125°C (-67°F to +257°F)
 ±0.5°C Accuracy from -10°C to +85°C
 9-Bit Thermometer Resolution
 Converts Temperature 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)
 Applications Include Thermostatic Controls,
Industrial Systems, Consumer Products,
Thermometers, or ^FA^unyⁿT^ch^teⁱr^omⁿa^all^ly ^DSeⁱn^as^giti^rv^ae^ms
System
PIN CONFIGURATIONS
MAXIM
DS1820
123
N.C. 1
N.C. ₂
V_DD
3
DQ 4
8 N.C.
7 N.C.
6 N.C.
5 GND
SO (150 mils)
(DS18S20Z)
12 3
(BOTTOM VIEW)
TO-92
(DS18S20)
DESCRIPTION
The DS18S20 digital thermometer provides 9-bit Celsius temperature measurements and has an alarm
function with nonvolatile user-programmable upper and lower trigger points. The DS18S20
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°C to +125°C
and is accurate to ±0.5°C over the range of –10°C to +85°C. In addition, the DS18S20 can derive power
directly from the data line (“parasite power”), eliminating the need for an external power supply.
Each DS18S20 has a unique 64-bit serial code, which allows multiple DS18S20s to function on the same
1-Wire bus. Thus, it is simple to use one microprocessor to control many DS18S20s 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
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Functional Diagrams continued at end of data sheet.
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For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5474; Rev 8/10