DS1720

Econ-Digital Thermometer and Thermostat


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Description

The DS1720 Digital Thermometer and Thermostat provides 9-bit temperature readings which indicate the temperature of the device. With three thermal alarm outputs, the DS1720 can also act as a thermostat. THIGH is driven high if the DS1720's temperature is greater than or equal to a user-defined temperature TH. TLOW is driven high if the DS1720's temperature is less than or equal to a user-defined temperature TL. TCOM is driven high when the temperature exceeds TH and stays high until the temperature falls below that of TL.

User-defined temperature settings are stored in non-volatile memory, so parts can be programmed prior to insertion in a system, as well as used in stand-alone applications without a CPU. Temperature settings and temperature readings are all communicated to/from the DS1720 over a simple 3-wire interface.

Key Features

  • Requires no external components
  • Supply voltage range covers from 2.7V to 5.5V
  • Measures temperatures from -55°C to +125°C in 0.5°C increments. Fahrenheit equivalent is -67°F to +257°F in 0.9°F increments
  • Temperature is read as a 9-bit value
  • Converts temperature to digital word in 1 second (max)
  • Thermostatic settings are user-definable and non-volatile
  • Data is read from/written via a 3-wire serial interface (CLK, DQ, active-low RST)
  • Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system
  • 8-pin SOIC (208 mil) package

Applications/Uses

  • Consumer Products
  • Industrial Systems
  • Thermally Sensitive Systems
  • Thermometers
  • Thermostatic Controls

Technical Documents

App Note 3930 Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices

Quality and Environmental Data

Product Reliability Reports: DS1720.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Temperature Family by Product Type
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

 
Status:
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