安全隐患排查手册.ppt

ds18b20毕业论文(设计)中英文资料
中英文资料
DS18B20
Programmable Resolution
1-Wire Digital Thermometer
FEATURES
_Unique 1-WireTM interface requires only oneport
pin munication
capability simplifies distributedtemperature
sensing applications
_ Requires no ponents
_ Can be powered from data line. Power supply
range is to
_ Zero standby power required
_ Measures temperatures from -55°C to
+125°C. Fahrenheit equivalent is -67°F to
+257°F
_ ??C accuracy from -10°C to +85°C
_ Thermometer resolution is programmable
from 9 to 12 bits
_ Converts 12-bit temperature to digital word in
750 ms .
_ User-definable, nonvolatile temperature alarm
settings
_ Alarm mand 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 DESCRIPTION
GND - Ground
DQ - Data In/Out
VDD - Power Supply Voltage
NC - No Connect
DESCRIPTION
The DS18B20 Digital Thermometer provides 9 to 12-bit configurable temperature readings which
indicate the temperature of the device.
Information is sent to/from the DS18B20 over a 1-Wire interface, so that only one wire and ground
needs to be connected from a central microprocessor to a DS18B20. Power for reading, writing, and
performing temperature conversions can be derived from the data line itself with no need for an external
power source.
Because each DS18B20 contains a unique silicon serial number, multiple DS18B20s can exist on the
same 1-Wire bus. This allows for placing temperature sensors in many different places. Applications
where this feature is useful include HVAC environmental controls, sensing temperatures inside buildings,
equipment or machinery, and process monitoring and control.
DETAILED PIN DESCRIPTION Table 1
DS18B20Z 8-pin SOIC and DS18P20P TSOC : All pins not specified in this table are not t