MAX31722/MAX31723 Digital Thermometers and Thermostats with SPI/3-Wire Interface General Description Benefits and Features The MAX31722/MAX31723 digital thermometers and Maximize System Accuracy in Broad Range of thermostats with an SPI/3-wire interface provide tem- Thermal Management Applications perature readings that indicate the device temperature. Measures Temperature from -55C to +125C MAX31722 Thermometer Accuracy of 2C No additional components are required the devices are truly temperature-to-digital converters. Temperature MAX31723 Thermometer Accuracy of 0.5C Configurable Resolution from 9 Bits to 12 Bits readings are communicated from the device over an SPI interface or a 3-wire serial interface. The choice of (0.5C to 0.0625C Resolution) Reduce Cost with No External Components interface is selectable by the user. For applications that require greater temperature resolution, the user can Extend Performance with Low-Voltage, 1.7V to 3.7V Power-Supply Range adjust the readout resolution from 9 to 12 bits. This is particularly useful in applications where thermal runaway Dedicated Thermostat Output with Nonvolatile User- Defined Thresholds for Quick Detection conditions must be detected quickly. The thermostat has a dedicated open-drain output (TOUT). Two thermostat Selectable SPI or 3-Wire Interface for Added Flexibility operating modes, comparator and interrupt, control ther- mostat operation based on user-defined nonvolatile trip Available in 8-Pin MAX Package for Board Space Savings points (T and T ). Both devices feature a 1.7V to HIGH LOW 3.7V supply rail. Ordering Information PART TEMP RANGE PIN-PACKAGE Applications MAX31722MUA+ -55NC to +125NC 8 FMAX Networking Equipment MAX31722MUA+T -55NC to +125NC 8 FMAX Cellular Base Stations MAX31723MUA+ -55NC to +125NC 8 FMAX Industrial Equipment MAX31723MUA+T -55NC to +125NC 8 FMAX Any Thermally Sensitive Systems +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. Functional Diagram PRECISION OVERSAMPLING DIGITAL REFERENCE MODULATOR DECIMATOR V DD V DD SDI CONFIGURATION/ SDO MAX31722 STATUS REGISTER SCLK MAX31723 I/O CONTROL CE AND TEMPERATURE SERMODE INPUT SENSE REGISTER TOUT GND T AND T THERMOSTAT HIGH LOW REGISTERS COMPARATOR MAX is a registered trademark of Maxim Integrated Products, Inc. 19-5629 Rev 3 6/21MAX31722/MAX31723 Digital Thermometers and Thermostats with SPI/3-Wire Interface Absolute Maximum Ratings Voltage Range on V Relative to GND ..............-0.3V to +6.0V Operating Junction Temperature Range ......... -55NC to +125NC DD Voltage Range on Any Other Pin Relative to GND ...-0.3V to +6.0V Storage Temperature Range ............................ -55NC to +125NC Continuous Power Dissipation (T = +70NC) Lead Temperature (soldering, 10s) ................................+300NC A FMAX (derate 4.5mW/NC above +70NC) ......................362mW Soldering Temperature (reflow) ......................................+260NC EEPROM Programming Temperature Range ..-40NC to +85NC Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional opera- tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Recommended Operating Characteristics (T = -55NC to +125NC, unless otherwise noted.) J PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage VDD (Note 1) 1.7 3.7 V Input Logic-High VIH (Note 1) 0.7 x VDD VDD + 0.3 V Input Logic-Low VIL (Note 1) -0.3 0.3 x VDD V DC Electrical Characteristics (V = 1.7V to 3.7V, T = -55NC to +125NC, unless otherwise noted.) DD J PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS -40NC to +85NC Q2.0 MAX31722 Thermometer Error TERR NC -55NC to +125NC Q3.0 0NC to +70NC Q0.5 MAX31723 Thermometer Error TERR NC -55NC to +125NC Q2.0 Resolution 9 12 Bits 9-bit conversions 25 10-bit conversions 50 Conversion Time tCONVT ms 11-bit conversions 100 12-bit conversions 200 Logic 0 Output (SDO, TOUT) VOL (Note 2) 0.4 V VDD - Logic 1 Output (SDO) VOH (Note 3) V 0.4 Leakage Current IL -1 +1 FA Active temperature conversions (Note 4) 1150 Communication only 100 Active Current ICC EEPROM writes (-40NC to +85NC) 1150 FA EEPROM writes during active temperature 1200 conversions (-40NC to +85NC) Shutdown Current ICC1 2 FA Maxim Integrated 2 www.maximintegrated.com