The DS18B20 is a versatile, programmable resolution 1-Wire digital thermometer designed for precise temperature measurements in a wide range of applications. Housed in a rugged TO-92 package, this sensor provides 9-bit to 12-bit Celsius temperature readings from -55°C to +125°C (-67°F to +257°F) with an accuracy of ±0.5°C over the -10°C to +85°C range.
Features:
Unique 1-Wire Interface.
Integrated Temperature Sensor and EEPROM.
No External Components Needed.
Parasite Power Mode.
Multidrop Capability.
Flexible Alarm Settings.
Low Power Consumption.
Specifications:
Absolute Maximum Ratings
Parameter
Min
Max
Unit
Voltage Range on Any Pin Relative to Ground
-0.5
+6.0
V
Operating Temperature Range
-55
+125
°C
Storage Temperature Range
-55
+125
°C
Solder Temperature
Refer to IPC/JEDEC J-STD-020
–
–
DC Electrical Characteristics (VDD = 3.0V to 5.5V, -55°C to +125°C)
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Supply Voltage
VDD
Local power
3.0
–
5.5
V
Pullup Supply Voltage
VPU
Parasite power
3.0
–
5.5
V
Local power
3.0
–
VDD
V
Thermometer Error
tERR
-10°C to +85°C
–
–
±0.5
°C
-30°C to +100°C
–
–
±1
°C
-55°C to +125°C
–
–
±2
°C
Input Logic-Low
VIL
–
-0.3
–
+0.8
V
Input Logic-High
VIH
Local power
+2.2
–
Min(5.5, VDD+0.3)
V
Parasite power
+3.0
–
–
V
Sink Current
IL
VIO = 0.4V
4.0
–
–
mA
Standby Current
IDDS
–
–
–
1µA
µA
Active Current
IDD
VDD = 5V
–
1
1.5
mA
DQ Input Current
IDQ
–
–
–
5
µA
Drift
–
–
–
–
±0.2
°C
AC Electrical Characteristics
Parameter
Symbol
Conditions
Min
Typ
Max
Units
NV Write Cycle Time
tWR
–
2
–
10
ms
EEPROM Writes
NEEWR
-55°C to +55°C
50k
–
–
writes
EEPROM Data Retention
tEEDR
-55°C to +55°C
10
–
–
years
Pin Configuration (TO-92 Package)
Pin
Name
Function
1
GND
Ground
2
DQ
Data Input/Output. Open-drain 1-Wire interface pin. Also provides power in parasite mode.
3
VDD
Optional VDD. Must be grounded for parasite power operation.
Applications:
Thermostatic controls for home and building automation.
Industrial systems for process monitoring and machinery temperature sensing.
Consumer products like digital thermometers and appliances.
Thermally sensitive systems, such as medical devices or food storage.
