datasheet_DS18B20

1 of 27050400FEATURES Unique 1-Wire interface requires only oneport pin for communication Multidrop capability simplifies distributedtemperature sensing applications Requires no external components Can be powered from data line. Power supplyrange is 3.0V to 5.5V Zero standby power required Measures temperatures from -55°C to+125°C. Fahrenheit equivalent is -67°F to+257°F ±0.5°C accuracy from -10°C to +85°C Thermometer resolution is programmablefrom 9 to 12 bits Converts 12-bit temperature to digital word in750 ms (max.) User-definable, nonvolatile temperature alarmsettings Alarm search command identifies andaddresses devices whose temperature isoutside of programmed limits (temperaturealarm condition) Applications include thermostatic controls,industrial systems, consumer products,thermometers, or any thermally sensitivesystemPIN ASSIGNMENTPIN DESCRIPTIONGND- GroundDQ- Data In/OutVDD- Power Supply VoltageNC- No ConnectDESCRIPTIONThe DS18B20 Digital Thermometer provides 9 to 12-bit (configurable) temperature readings whichindicate 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, andperforming temperature conversions can be derived from the data line itself with no need for an externalpower source.Because each DS18B20 contains a unique silicon serial number, multiple DS18B20s can exist on thesame 1-Wire bus. This allows for placing temperature sensors in many different places. Applicationswhere this feature is useful include HVAC environmental controls, sensing temperatures inside buildings,equipment or machinery, and process monitoring and control...