DS18B20 Digital Temperature Sensor0 pages
USTSensor
•UST18B20
Digital Temperature Sensor UST18B20
DESCRIPTION
The DS18B20 Digital Thermometer provides 9 to 12-bit (confi-
gurable) temperature readings which indicate the temperature
of the device.
nformation is sent to/from the DS18B20 over a 1 -Wire interfa-
ce, so that only one wire (and ground) needs to be connected
from a central microprocessor to a DS18B20. Power for readi-
ng, writing, and performing temperature conversions can be d-
erived from the data line itself with no need for an external po-
wer source.
Because each DS18B20 contains a unique silicon serial num-
ber, multiple DS18B20s can exist on the same 1-Wire bus. Th-
s allows for placing temperature sensors in many different pl-
aces. Applications where this feature is useful include HVAC
environmental controls, sensing temperatures inside building,
equipment or machinery, and process monitoring and control.
FEATURES
■ Unique 1-Wire interface requires only one port pin for communication
■ Multidrop capability simplifies distributed temperature sensing applications
■ Requires no external components
■ Can be powered from data line. Power supply range is 3. OV to 5. 5V
■ Zero standby power required
■ Measures temperatures from -55t to+125t. Fahrenheit equivalent is -67°F to+257°F
■ +0. 5t accuracy from -1 0t to +85t
■ Thermometer resolution is programmablefrom 9 to 12 bits
■ Converts 12-bit temperature to digital word in 750 ms (max.)
■ User-definable, nonvolatile temperature 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
KOTTOM Vll-W
TUV
a a a
z a a
a >
DSI 8R20 To-92
Package
NCQE
DQQE
8 Tn NC
7 IOJNC
8 TT1 NC
5 | | |GND
DS18B20Z
8-Pin SOIC(150mi1)
PIN DESCRIPTION
GND - Ground
DQ - Data In/Out
VDD- Power Supply Voltage
NC - No Connect
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Add: Eastlake Hi-Tech Development zone, Wuhan
Tel :+0086(27)-87531645/87531655
Fax :+0086(27)-87531665
E-Mail: ust@ustsensor.com
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