MAX31722: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.

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
MAX31722, MAX31723: Functional Diagram
MAX31722, MAX31723: Functional Diagram
DataSheet
titleDownload file
MAX31722-MAX31723 Data SheetMAX31722-MAX31723.pdf
Parametrics
Part NumberSensor TypeAlarm OutputFunctionsInterfaceChannelsAccuracy
(±°C)
Parasite Pwr.Temp. Thresh.Temp. Resolution
(bits)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
See Notes
MAX31722LocalOvertSingle Temperature Alarm
Standalone Thermostat
3-Wire/SPI
3-Wire
One2NoProgrammable (NV)12-55 to +125µMAX/8$1.02 @1k
MAX317230.5µMAX/8$1.80 @1k
Design kits & evaluation modules
Quality and Environmental Data
Related Products
  • DS75LV:Digital Thermometer and Thermostat
  • DS1722:Digital Thermometer with SPI/3-Wire Interface
  • DS1620:Digital Thermometer and Thermostat
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX31722MUA+ActiveµMAX,;8 pin;15.6 mm²-55°C to +125°CLead Free
MAX31722MUA+TActiveµMAX,;8 pin;15.6 mm²-55°C to +125°CLead Free
MAX31722-MAX31723.pdf MAX31723
MAX31722-MAX31723_cn.pdf MAX31723
MAX31722.pdf MAX31722
MAX31722-MAX31723_cn.pdf MAX31723