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DS1722

DS1722

Digital Thermometer with SPI/3-Wire Interface

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Overview

Description

The DS1722 Digital Thermometer and Thermostat with SPI/3-Wire Interface provides temperature readings which indicate the temperature of the device. No additional components are required; the device is truly a temperature-to-digital converter. Temperature readings are communicated from the DS1722 over a Motorola SPI interface or a standard 3-wire serial interface. The choice of interface standard is selectable by the user.

For applications that require greater temperature resolution, the user can adjust the readout resolution from 8 to 12 bits. This is particularly useful in applications where thermal runaway conditions must be detected quickly. For application flexibility, the DS1722 features a wide analog supply rail of 2.65V - 5.5V. A separate digital supply allows a range of 1.8V to 5.5V.

The DS1722 is available in an 8-pin SO (150mil) and 8-pin µMAX package.

Applications for the DS1722 include personal computers/servers/workstations, cellular telephones, office equipment, or any thermally-sensitive system.
DS1722: Functional Block Diagram DS1722: Functional Block Diagram Enlarge+

Key Features

  • Temperature Measurements Require No External Components
  • Measures Temperatures from -55°C to +120°C. Fahrenheit Equivalent is -67°F to +248°F
  • Thermometer Accuracy is ±2.0°C
  • Thermometer Resolution is Configurable from 8 to 12 bits (1.0°C to 0.0625°C Resolution)
  • Data is Read From/Written to Via a Motorola Serial Peripheral Interface (SPI) or Standard 3-Wire Serial Interface
  • Wide Analog Power Supply Range (2.65V - 5.5V)
  • Separate Digital Supply Allows for 1.8V Logic
  • Available in an 8-Pin SO (150mil) and 8-Pin µMAX package

Applications/Uses

  • Cell Phone Base Stations
  • Computer Peripherals
  • Networking
  • Telecommunications
  • Test Systems

Parametric Specs

Part NumberSensor TypeInterfaceChannelsAccuracy
(±°C)		Parasite Pwr.Temp. Resolution
(bits)		Oper. Temp.
(°C)		Package/PinsBudgetary
Price
See Notes
DS1722 Local3-Wire/SPIOne2No
8
9
10
11
12
-55 to +125
SOIC (N)/8
UMAX/8
$1.19 @1k
See All Temperature Sensors (111)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

Technical Documents

Tutorial 4679 Thermal Management Handbook
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: DS1722.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Temperature Family by Product Type

CAD Symbols and Footprints

  • DS1722S+
  • DS1722S+T&R
  • DS1722U+
  • DS1722U+T&R
    •

    Quality And Environmental

    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    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 >

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