DS18B20X
Flipchip 1-Wire
®
Digital Thermometer
www.dalsemi.com
FEATURES
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Unique 1-wire interface requires only one
port pin for communication
Each device has a unique 64-bit serial code
stored in an on-board ROM
Multi-drop 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)
±2.0°C
accuracy from 0°C to +70°C
Thermometer resolution is user-selectable
from 9 to 12 bits
Converts temperature to 12-bit digital word in
750 ms (max.)
User-definable nonvolatile 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
PIN ASSIGNMENT
(TOP VIEW)
GND
VDD
28rrd
GND
DQ
Branding legend:
28 = family code
rr = revision code (i.e., B6)
d = one letter date code
See Mechanical Specification
(page 21) for package dimensions.
PIN DESCRIPTION
GND - Ground
DQ
- Data In/Out
V
DD
- Power Supply Voltage
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DESCRIPTION
The DS18B20X Digital Thermometer provides 9 to 12–bit centigrade temperature measurements and has
an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18B20X
communicates over a 1-wire bus that by definition requires only one data line (and ground) for
communication with a central microprocessor. It has an operating temperature range of –55°C to +125°C
and is accurate to
±2.0°C
over the range of 0°C to +70°C. In addition, the DS18B20X can derive power
directly from the data line (“parasite power”), eliminating the need for an external power supply.
Each DS18B20X has a unique 64-bit serial code, which allows multiple DS18B20Xs to function on the
same 1–wire bus; thus, it is simple to use one microprocessor to control many DS18B20Xs 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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043001
DALLAS [ DALLAS SEMICONDUCTOR ]
