±0.25°C Accurate, 16-Bit Digital SPI Temperature Sensor ADT7320 Data Sheet FEATURES GENERAL DESCRIPTION High performance Temperature accuracy ±0.20°C from −10°C to +85°C at 3.0 V ±0.25°C from −20°C to +105°C at 2.7 V to 3.3 V 16-bit temperature resolution: 0.0078°C Ultralow temperature drift: 0.0073°C NIST traceable or equivalent Fast first temperature conversion on power-up of 6 ms Easy implementation No temperature calibration/correction required by user No linearity correction required Low power Power saving 1 sample per second (SPS) mode 700 µW typical at 3.3 V in normal mode 7 µW typical at 3.3 V in shutdown mode Wide operating ranges Temperature range: −40°C to +150°C Voltage range: 2.7 V to 5.5 V Programmable interrupts Critical overtemperature interrupt Overtemperature/undertemperature interrupt SPI-compatible interface 16-lead, RoHS-compliant, 4 mm × 4 mm LFCSP package The ADT7320 is a high accuracy digital temperature sensor that offers breakthrough performance over a wide industrial temperature range, housed in a 4 mm × 4 mm LFCSP package. It contains an internal band gap reference, a temperature sensor, and a 16-bit analog-to-digital converter (ADC) to monitor and digitize the temperature to a resolution of 0.0078°C. The ADC resolution, by default, is set to 13 bits (0.0625°C). The ADC resolution is a user programmable mode that can be changed through the serial interface. The ADT7320 is guaranteed to operate over supply voltages from 2.7 V to 5.5 V. Operating at 3.3 V, the average supply current is typically 210 µA. The ADT7320 has a shutdown mode that powers down the device and offers a shutdown current of typically 2.0 µA at 3.3 V. The ADT7320 is rated for operation over the −40°C to +150°C temperature range. The CT pin is an open-drain output that becomes active when the temperature exceeds a programmable critical temperature limit. The INT pin is also an open-drain output that becomes active when the temperature exceeds a programmable limit. The INT pin and CT pin can operate in either comparator or interrupt mode. PRODUCT HIGHLIGHTS RTD and thermistor replacement Thermocouple cold junction compensation Medical equipment Industrial control and test Food transportation and storage Environmental monitoring and HVAC Laser diode temperature control Ease of use, no calibration or correction required by the user. Low power consumption. Excellent long term stability and reliability. High accuracy for industrial, instrumentation, and medical applications. Packaged in a 16-lead, RoHS-compliant, 4 mm × 4 mm LFCSP package. FUNCTIONAL BLOCK DIAGRAM TEMPERATURE VALUE REGISTER TCRIT REGISTER STATUS REGISTER THIGH REGISTER INTERNAL REFERENCE TCRIT TEMPERATURE SENSOR FILTER LOGIC THYST REGISTER CONFIGURATION REGISTER INTERNAL OSCILLATOR Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2012 Analog Devices, Inc. All rights reserved.

Last Content Update: 06/09/2017 Technical Articles • Home is Where the Heart Is DESIGN RESOURCES ^ • ADT7320 Material Declaration • PCN-PDN Information • Quality And Reliability • Symbols and Footprints DISCUSSIONS^ View all ADT7320 EngineerZone Discussions. View a parametric search of comparable parts. EVALUATION KITS • ADT7420 Evaluation Board DOCUMENTATION ^ Data Sheet • ADT7320: ±0.25°C Accurate, 16-Bit Digital SPI Temperature Sensor Data Sheet User Guides • UG-138: Evaluating the ADT7320/ADT7420 Temperature Sensors TOOLS AND SIMULATIONS ^ • ADT7320 IBIS Model REFERENCE DESIGNS ^ • CN0172...

Data Sheet REVISION HISTORY 12/12—Revision 0: Initial Version

Data SheetSPECIFICATIONS Ta = -40°C to +125°C, Vdd = 2.7 V to 5.5 V, unless otherwise noted.

Data Sheet Parameter 1 Accuracy specification includes repeatability. 2 The equivalent 3 o limits are ±0.15°C. This 3 o specification is provided to enable comparison with other vendors who use these limits. 3 For higher accuracy at 5 V operation, contact Analog Devices, Inc. 4 Temperature hysteresis does not include repeatability. 5 Based on a floating average of 10 readings. 6 Drift includes solder heat resistance and lifetime test performed as per JEDEC Standard JESD22-A108. SPI TIMING SPECIFICATIONS Ta = -40°C to +150°C, Vdd = 2.7 V to 5.5 V, unless otherwise noted. All input signals are...

ADT7320 ABSOLUTE MAXIMUM RATINGS Table 3. Parameter Vdd to GND DIN Input Voltage to GND DOUT Voltage to GND SCLK Input Voltage to GND CS Input Voltage to GND CT and INT Output Voltage to GND ESD Rating (Human Body Model) Operating Temperature Range1 Storage Temperature Range Maximum Junction Temperature, Tjmax Power Dissipation2 Thermal Impedance4 0ja, Junction-to-Ambient (Still Air) 0jc, Junction-to-Case IR Reflow Soldering Peak Temperature (RoHS-Compliant Package) Time at Peak Temperature Ramp-Up Rate Ramp-Down Rate Time from 25°C to Peak Temperature -6°C/sec maximum 8 minutes maximum 1 Sustained...

Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions

TEMPERATURE (°C) Figure 5. Temperature Accuracy at 5 V

Data Sheet 85°C 80 IT TAKES LESS THAN 2 SECONDS FOR THE DUT TO REACH 63.2% OF ITS FINAL TEMPERATURE SPAN Figure 10. Thermal Response Time

Data Sheet THEORY OF OPERATION CIRCUIT INFORMATION The ADT7320 is a high accuracy digital temperature sensor that uses a 16-bit ADC to monitor and digitize the temperature to a resolution of 0.0078°C. By default, the ADC resolution is set to 13 bits (0.0625°C). An internal temperature sensor generates a voltage proportional to absolute temperature; this voltage is compared to an internal voltage reference and input into a precision digital modulator. The internal temperature sensor has high accuracy and linearity over the entire rated temperature range without the need for correction or calibration...