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.


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    SPECIFICATION

    ● 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