MAX31725/MAX31726 0.5C Local Temperature Sensors General Description Benefits and Features The MAX31725/MAX31726 temperature sensors S High Accuracy and Low-Voltage Operation Aids accurately measure temperature and provide an Designers in Meeting Error and Power Budgets overtemperature alarm/interrupt/shutdown output. These 0.5C Accuracy from -40C to +105C devices convert the temperature measurements to digital 16-Bit (0.00390625C) Temperature Resolution form using a high-resolution, sigma-delta, analog-to- 2.5V to 3.7V Supply Voltage Range digital converter (ADC). Accuracy is Q0.5NC from -40NC S One-Shot and Shutdown Modes Help Reduce 2 to +105NC. Communication is through an I C-compatible Power Usage 2-wire serial interface. 925A (max) Operating Supply Current 2 The I C serial interface accepts standard write byte, read S Extended Temperature Range Enables byte, send byte, and receive byte commands to read Measurements in High Temperature Systems the temperature data and configure the behavior of the (Measures Up to +150C) open-drain overtemperature shutdown output. S Digital Functions Make Integration Easier into Any The MAX31725 features three address select lines with a System total of 32 available addresses. The MAX31726 features Selectable Timeout Prevents Bus Lockup two address select lines with a total of 16 available (Default Enabled for MAX31725 Default addresses and a RESET input. The sensors have a Disabled for MAX31726) 2.5V to 3.7V supply voltage range, low 600FA supply Separate Open-Drain OS Output Operates as 2 current, and a lockup-protected I C-compatible interface Interrupt or Comparator/Thermostat Output that make them ideal for a wide range of applications, RESET Input (MAX31726) including PCs, electronic test equipment, and office electronics. Applications Both devices are available in an 8-pin TDFN package and Servers Telecom operate over the -55NC to +150NC temperature range. Networking Industrial Ordering Information appears at end of data sheet. Typical Application Circuits +2.5V TO +3.7V +2.5V TO +3.7V 4.7k 4.7k SDA V SDA V DD DD 2 2 TO I C TO I C 0.1F 0.1F MASTER MASTER SCL A0 SCL A0 MAX31725 MAX31726 OS A1 OS A1 GND A2 GND RESET For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/MAX31725.related For pricing, delivery, and ordering information, please contact Maxim Direct at 19-6477 Rev 2 12/14 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com.MAX31725/MAX31726 0.5C Local Temperature Sensors ABSOLUTE MAXIMUM RATINGS (All voltages relative to GND.) ESD Protection (All Pins, Human Body Model) (Note 1) .... Q4000V Voltage Range on V , SDA, SCL, A0, A1 ............-0.3V to +4V Operating Temperature Range ........................ -55NC to +150NC DD Voltage Range on A2, RESET, OS ........... -0.3V to (V + 0.3V) Junction Temperature .....................................................+150NC DD Input Current at Any Pin ................................................... +5mA Storage Temperature Range ............................ -65NC to +150NC Package Input Current ................................................... +20mA Lead Temperature (soldering, 10s) ................................+300NC Continuous Power Dissipation (T = +70NC) Soldering Temperature (reflow) .....................................+260NC A TDFN (derate 24.4mW/NC above +70NC) ...............1951.2mW Note 1: Human Body Model, 100pF discharged through a 1.5kI resistor. 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. PACKAGE THERMAL CHARACTERISTICS (Note 2) TDFN Junction-to-Ambient Thermal Resistance (q ) ..........41C/W JA Junction-to-Case Thermal Resistance (q ) .................8C/W JC Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. RECOMMENDED OPERATING CONDITIONS N N (T = -55 C to +150 C, unless otherwise noted.) (Notes 3, 4) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Supply Voltage V 2.5 3.3 3.7 V DD Input High Voltage V V x 0.7 V IH DD Input Low Voltage V V x 0.3 V IL DD ELECTRICAL CHARACTERISTICS N N (V = 2.5V to 3.7V, T = -55 C to +150 C, unless otherwise noted. Typical values are V = 3.3V, T = +25NC.) (Note 3) DD A DD A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 2.5V P + V P 3.7V, -40NC P T P +105NC -0.5 0.1 +0.5 DD A Accuracy (Note 5) NC 2.5V P + V P 3.7V, -55NC P T P +150NC -0.7 +0.7 DD A Temperature Conversion Noise 0.0625 NC Temperature Data Resolution 16 16 Bits Conversion Time 44 50 ms First Conversion Completed Data ready after POR 50 ms 2 I C inactive, T = -40NC to +125NC 600 925 A 2 Shutdown mode, I C inactive, T = A 2.5 3.5 -40NC to +125NC Quiescent Supply Current I FA DD 2 I C inactive, T = +150NC 800 A 2 Shutdown mode, I C inactive, 4.2 T = +150NC A Maxim Integrated 2