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

DataSheet

title	Download file
MAX31722-MAX31723 Data Sheet	MAX31722-MAX31723.pdf

Parametrics

Part Number	Sensor Type	Alarm Output	Functions	Interface	Channels	Accuracy (±°C)	Parasite Pwr.	Temp. Thresh.	Temp. Resolution (bits)	Oper. Temp. (°C)	Package/Pins	Budgetary Price
Part Number	Sensor Type	Alarm Output	Functions	Interface	Channels	Accuracy (±°C)	Parasite Pwr.	Temp. Thresh.	Temp. Resolution (bits)	Oper. Temp. (°C)	Package/Pins	See Notes
MAX31722	Local	Overt	Single Temperature Alarm Standalone Thermostat	3-Wire/SPI 3-Wire	One	2	No	Programmable (NV)	12	-55 to +125	µMAX/8	$1.02 @1k
MAX31723	Local	Overt	Single Temperature Alarm Standalone Thermostat	3-Wire/SPI 3-Wire	One	0.5	No	Programmable (NV)	12	-55 to +125	µMAX/8	$1.80 @1k