Transcription of Programmable Resolution 1-Wire Digital Thermometer
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Programmable Resolution 1-Wire Digital Thermometer
1 of 27050400 FEATURES 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 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 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 is sent to/from
Since the operating current of the DS18B20 is up to 1.5 mA, the DQ line will not have sufficient drive due to the 5k pullup resistor. This problem is particularly acute if several DS18B20s are on the same DQ and attempting to convert simultaneously. There are two ways to assure that the DS18B20 has sufficient supply current during its active ...
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