Digital Thermometer with SPI/3-Wire Interface

Please check latest availability status for a specific part variant.


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


  • Cell Phone Base Stations
  • Computer Peripherals
  • Networking
  • Telecommunications
  • Test Systems
Part NumberSensor TypeInterfaceChannelsAccuracy
Parasite Pwr.Temp. Resolution
Oper. Temp.
See Notes
DS1722 Local3-Wire/SPIOne2No
-55 to +125
$1.19 @1k
See All Temperature Sensors (113)
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.

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 >

Related Resources

High-Speed, Octal, Industrial Digital Input with Parallel Output

  • High-Speed, Industrial Digital Inputs
  • High Integration Reduces BOM Count and Board Space
  • Low Power and Low Heat Dissipation

Ultra-Low-Power, Single-Channel Integrated Bioimpedance (BioZ) AFE

  • BioZ AFE with High Resolution Data Converter
  • High AC Dynamic Range of 90mVP-P Will Help Prevent Saturation in the Presence of Motion/Direct Electrode Hits
  • Longer Battery Life Compared to Competing Solutions

Ultra-Low Power Biometric Sensor Hub

  • Biometric Sensor Hub Solution Enables Faster Time to Market
  • Finger-Based (Version A) Algorithms Measure
  • Both Raw and Processed Data Are Available

Octal Industrial Digital Input with Diagnostics

  • High Integration Reduces BOM Count and Board Space
  • Reduced Power and Heat Dissipation
  • Fault Tolerant with Built-In Diagnostics

Parasitically Powered Digital Input

  • High Integration for Flexible Circuit Designs
  • Reduced Power and Heat Dissipation
  • Robust Design

MAXREFDES220#: Finger Heart Rate and Pulse Oximeter Smart Sensor with Digital Signal Processing