Digital Thermometers and Thermostats with SPI/3-Wire Interface

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.

Applications

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

* 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