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Digital Thermometers and Thermostats with SPI/3-Wire Interface

Industry's First Low-Voltage 3-Wire/SPI Temperature Sensors Enable Easy Implementation Into Low-Power Systems

Product Details

Key Features

Applications/Uses

Parametric specs for Temperature Sensors
Sensor Type Local
# Channels One
Interface 3-Wire
3-Wire/SPI
Alarm Output Overt
Functions Single Temperature Alarm
Standalone Thermostat
Accuracy (±°C) 0.5
Parasite Pwr. No
Temp. Thresh. Programmable (NV)
Temp. Resolution (bits) 12
Oper. Temp. (°C) -55 to +125
Package/Pins UMAX/8
Budgetary
Price (See Notes)
2
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Simplified Block Diagram

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Parameters

Parametric specs for Temperature Sensors
Sensor Type Local
# Channels One
Interface 3-Wire
3-Wire/SPI
Alarm Output Overt
Functions Single Temperature Alarm
Standalone Thermostat
Accuracy (±°C) 0.5
Parasite Pwr. No
Temp. Thresh. Programmable (NV)
Temp. Resolution (bits) 12
Oper. Temp. (°C) -55 to +125
Package/Pins UMAX/8
Budgetary
Price (See Notes)
2

Key Features

  • Maximize System Accuracy in Broad Range of Thermal Management Applications
    • Measures Temperature from -55°C to +125°C
    • MAX31722 Thermometer Accuracy of ±2°C
    • MAX31723 Thermometer Accuracy of ±0.5°C
    • Configurable Resolution from 9 Bits to 12 Bits (0.5°C to 0.0625°C Resolution)
  • Reduce Cost with No External Components
  • Extend Performance with Low-Voltage, 1.7V to 3.7V Power-Supply Range
  • Dedicated Thermostat Output with Nonvolatile User-Defined Thresholds for Quick Detection
  • Selectable SPI or 3-Wire Interface for Added Flexibility
  • Available in 8-Pin µMAX® Package for Board Space Savings

Applications/Uses

  • Any Thermally Sensitive Systems
  • Cellular Base Stations
  • Industrial Equipment
  • Networking Equipment

Description

The MAX31722/MAX31723 digital thermometers and thermostats with an SPI/3-wire interface provide temperature readings that indicate the device temperature. No additional components are required; the devices are truly temperature-to-digital converters. Temperature readings are communicated from the device over an SPI interface or a 3-wire serial interface. The choice of interface is selectable by the user. For applications that require greater temperature resolution, the user can adjust the readout resolution from 9 to 12 bits. This is particularly useful in applications where thermal runaway conditions must be detected quickly. The thermostat has a dedicated open-drain output (active-low TOUT). Two thermostat operating modes, comparator and interrupt, control thermostat operation based on user-defined nonvolatile trip points (THIGH and TLOW). Both devices feature a 1.7V to 3.7V supply rail.

Simplified Block Diagram

MAX31722, MAX31723: Functional Diagram MAX31722, MAX31723: Functional Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .