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General 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. 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.
Applications
● Thermostatic Controls
● Industrial Systems
● Consumer Products
● Thermometers
● Thermally Sensitive Systems
Benets and Features
● Unique 1-Wire
®
Interface Requires Only One Port
Pin for Communication
● Reduce Component Count with Integrated
Temperature Sensor and EEPROM
• Measures Temperatures from -55°C to +125°C
(-67°F to +257°F)
• ±0.5°C Accuracy from -10°C to +85°C
• Programmable Resolution from 9 Bits to 12 Bits
• No External Components Required
● Parasitic Power Mode Requires Only 2 Pins for
Operation (DQ and GND)
● Simplifies Distributed Temperature-Sensing
Applications with Multidrop Capability
• Each Device Has a Unique 64-Bit Serial Code
Stored in On-Board ROM
● Flexible User-Definable Nonvolatile (NV) Alarm Settings
with Alarm Search Command Identifies Devices with
Temperatures Outside Programmed Limits
● Available in 8-Pin SO (150 mils), 8-Pin µSOP, and
3-Pin TO-92 Packages
19-7487; Rev 5; 9/18
Ordering Information appears at end of data sheet.
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
Pin Congurations
BOTTOM VIEW
8
7
6
5
2
N.C.
N.C.
V
DD
DQ
N.C.
N.C.
N.C.
GND
DS18B20
SO (150 mils)
(DS18B20Z)
+
1
4
3
7
8
5
6
1
2
3
4
+
DQ
N.C.
N.C.
GND
V
DD
N.C.
N.C.
N.C.
DS18B20
µSOP
(DS18B20U)
DS18B20
1 2 3
GND DQ V
DD
1
1 2 3
TOP VIEW
TO-92
(DS18B20)
DS18B20 Programmable Resolution
1-Wire Digital Thermometer
Click here for production status of specific part numbers.
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