DS18B20：Programmable Resolution 1-Wire Digital Thermometer

High-Precision Temperature Monitoring with Minimal Connections Ideal for Multisensor Systems

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. FAQs: DS18B20

Key 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

DS18B20: Block Diagram

Applications/Uses

Consumer Products
Industrial Systems
Thermally Sensitive Systems
Thermometers
Thermostatic Controls

DataSheet

title	Download file
DS18B20 Data Sheet	DS18B20.pdf

Parametrics

Part Number	Sensor Type	Interface	Channels	Accuracy (±°C)	Parasite Pwr.	Temp. Thresh.	Temp. Resolution (bits)	Multi Droppable	Oper. Temp. (°C)	Package/Pins	Budgetary Price
Part Number	Sensor Type	Interface	Channels	Accuracy (±°C)	Parasite Pwr.	Temp. Thresh.	Temp. Resolution (bits)	Multi Droppable	Oper. Temp. (°C)	Package/Pins	See Notes
DS18B20	Local	1-Wire	One	0.5	Yes	Programmable (NV)	9 10 11 12	Yes	-55 to +125	µMAX/8 SOIC(N)/8 TO92/3	$1.88 @1k

Quality and Environmental Data

DS18B20.pdf

Ordering Information

Part Number	Status	Recommended Replacement	Package	Temp	RoHS
DS18B20	No Longer Available	DS18B20+	TO92,;3 pin;19.5 mm²	-55°C to +125°C	No
DS18B20+	Active		TO92,;3 pin;19.5 mm²	-55°C to +125°C	Lead Free
DS18B20+T&R	Active		TO92,;3 pin;27.6 mm²	-55°C to +125°C	Lead Free
DS18B20-SL+T&R	Active		TO92,;3 pin;19.5 mm²	-55°C to +125°C	Lead Free
DS18B20-SL/T&R	No Longer Available	DS18B20-PAR+T&R	TO92,;3 pin;19.5 mm²	-55°C to +125°C	No
DS18B20/GG8	Active		TO92,;3 pin;19.5 mm²	-55°C to +125°C	No
DS18B20/T&R	No Longer Available	DS18B20-SL+T&R	TO92,;3 pin;27.6 mm²	-55°C to +125°C	No
DS18B20U	No Longer Available	DS18B20U+	µMAX,;8 pin;15.6 mm²	-55°C to +125°C	No
DS18B20U+	Active		µMAX,;8 pin;15.6 mm²	-55°C to +125°C	Lead Free
DS18B20U+T&R	Active		µMAX,;8 pin;15.6 mm²	-55°C to +125°C	Lead Free
Part Number	Status	Recommended Replacement	Package	Temp	RoHS
DS18B20U/T&R	No Longer Available	DS18B20U+T&R	µMAX,;8 pin;15.6 mm²	-55°C to +125°C	No
DS18B20Z	No Longer Available	DS18B20Z+	SOIC(N),;8 pin;30.9 mm²	-55°C to +125°C	No
DS18B20Z+	Active		SOIC(N),;8 pin;30.9 mm²	-55°C to +125°C	Lead Free
DS18B20Z+T&R	Active		SOIC(N),;8 pin;30.9 mm²	-55°C to +125°C	Lead Free
DS18B20Z/T&R	No Longer Available	DS18B20Z+T&R	SOIC(N),;8 pin;30.9 mm²	-55°C to +125°C	No