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


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.
MAX31722, MAX31723: Functional Diagram MAX31722, MAX31723: Functional Diagram Enlarge+

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
Part Number Sensor Type Alarm Output Functions Interface Channels Accuracy
Parasite Pwr. Temp. Thresh. Temp. Resolution
Oper. Temp.
Package/Pins Budgetary
See Notes
MAX31722  Local Overt
Single Temperature Alarm
Standalone Thermostat
One 2 No Programmable (NV) 12 -55 to +125
$1.02 @1k
MAX31723  0.5
$1.80 @1k
See All Temperature Sensors (112)
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.

MAX31723PMB1: MAX31723PMB1 Peripheral Module
MAXPMBAE: Maxim Analog Essentials Collection of Peripheral Modules

Quality and Environmental Data

Product Reliability Reports: MAX31723.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Related Resources

Human Body Temperature Sensor

  • High Accuracy and Low-Voltage Operation Aids Designers in Meeting Error and Power Budgets
  • One-Shot and Shutdown Modes Help Reduce Power Usage
  • 600µA (typ) Operating Supply Current