DIGITAL TEMPERATURE MODULE DS18B20

DIGITAL TEMPERATURE MODULE DS18B20
 

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.

Features:

• Unique 1-Wire® interface requires only one port pin for communication
• Each device has a unique 64-bit serial code stored in an onboard 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
• Thermometer resolution is user-selectable from 9 to 12 bits
• Converts temperature to 12-bit digital word in 750ms (max.)
• User-definable nonvolatile (NV) alarm settings
• Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition)
• Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system

Technical Details

• Input Voltage: 3 – 5.5V
• Temperature Range: -55°C to 125°C
• Accuracy: ±0.5°C