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 |
Pinout:
| 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.
- HVAC environmental controls.
- Equipment and building temperature monitoring.
Package Contents:
- 1x DS18B20 Digital Temperature Sensor TO-92.
