DS18B20 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
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Industrial Systems
Consumer Products
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