Automotive, 0.5C Accurate, 16-Bit Digital SPI Temperature Sensor Data Sheet ADT7311 FEATURES GENERAL DESCRIPTION Qualified for automotive applications The ADT7311 is a high accuracy digital temperature sensor High performance in a narrow 8-lead SOIC package. It contains a band gap Temperature accuracy temperature reference and a 16-bit ADC to monitor and digitize 0.5C from 40C to +105C (2.7 V to 3.6 V) the temperature to a 0.0078C resolution. The ADC resolution, 0.4C from 40C to +105C (3.0 V) by default, is set to 13 bits (0.0625C). The ADC resolution is a 16-bit temperature resolution: 0.0078C user programmable mode that can be changed through the Fast first conversion on power-up of 6 ms serial interface. Easy implementation No temperature calibration/correction required by user The ADT7311 is guaranteed to operate over supply voltages from No linearity correction required 2.7 V to 5.5 V. Operating at 3.3 V, the average supply current is Low power typically 210 A. The ADT7311 has a shutdown mode that Power saving 1 sample per second (SPS) mode powers down the device and offers a shutdown current of 700 W typical at 3.3 V in normal mode typically 2 A. The ADT7311 is rated for operation over the 7 W typical at 3.3 V in shutdown mode 40C to +150C temperature range. Wide operating ranges The CT pin is an open-drain output that becomes active when Temperature range: 40C to +150C the temperature exceeds a programmable critical temperature Voltage range: 2.7 V to 5.5 V limit. The default critical temperature limit is 147C. The INT Programmable interrupts pin is also an open-drain output that becomes active when the Critical overtemperature interrupt temperature exceeds a programmable limit. The INT and CT Overtemperature/undertemperature interrupt pins can operate in either comparator or interrupt mode. SPI-compatible interface 8-lead narrow SOIC RoHS-compliant package PRODUCT HIGHLIGHTS APPLICATIONS 1. Ease of use, no calibration or correction required by the user. Battery management 2. Low power consumption. Climate control and infotainment 3. Excellent long-term stability and reliability. Lighting 4. Packaged in an 8-lead SOIC, RoHS-compliant package. Powertrain Thermocouple cold junction compensation GPS FUNCTIONAL BLOCK DIAGRAM 1 SCLK ADT7311 2 INTERNAL DOUT OSCILLATOR INTERNAL 3 DIN REFERENCE 6 CT 4 T CS CRIT - TEMPERATURE MODULATOR TEMPERATURE CONFIGURATION, SENSOR 5 INT VALUE STATUS, AND REGISTER ID REGISTERS T HIGH T T HYST CRIT FILTER REGISTER REGISTER LOGIC 7 GND T LOW T T HIGH LOW REGISTER REGISTER V 8 DD Figure 1. Rev. 0 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. SPI INTERFACE 09050-001ADT7311 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Configuration Register .............................................................. 14 Applications....................................................................................... 1 Temperature Value Register...................................................... 15 General Description ......................................................................... 1 ID Register................................................................................... 15 Product Highlights ........................................................................... 1 TCRIT Setpoint Register ............................................................... 15 Functional Block Diagram .............................................................. 1 T Setpoint Register............................................................... 16 HYST Revision History ............................................................................... 2 T Setpoint Register .............................................................. 16 HIGH Specifications..................................................................................... 3 T Setpoint Register ............................................................... 16 LOW SPI Timing Specifications ........................................................... 4 Serial Peripheral Interface ............................................................. 17 Absolute Maximum Ratings............................................................ 5 SPI Command Byte.................................................................... 17 ESD Caution.................................................................................. 5 Writing Data ............................................................................... 18 Pin Configuration and Function Descriptions............................. 6 Reading Data............................................................................... 19 Typical Performance Characteristics ............................................. 7 Interfacing to DSPs or Microcontrollers................................. 19 Theory of Operation ........................................................................ 9 Serial Interface Reset.................................................................. 19 Circuit Information...................................................................... 9 INT and CT Outputs...................................................................... 20 Converter Details.......................................................................... 9 Undertemperature and Overtemperature Detection ............ 20 Temperature Measurement ......................................................... 9 Applications Information .............................................................. 22 One-Shot Mode .......................................................................... 10 Thermal Response Time ........................................................... 22 1 SPS Mode.................................................................................. 10 Supply Decoupling ..................................................................... 22 Shutdown..................................................................................... 11 Powering from a Switching Regulator..................................... 22 Fault Queue ................................................................................. 11 Temperature Monitoring........................................................... 22 Temperature Data Format......................................................... 12 Quick Guide to Measuring Temperature ................................ 22 Temperature Conversion Formulas ......................................... 12 Outline Dimensions....................................................................... 23 Registers ........................................................................................... 13 Ordering Guide .......................................................................... 23 Status Register............................................................................. 13 Automotive Products................................................................. 23 REVISION HISTORY 9/11Revision 0: Initial Version Rev. 0 Page 2 of 24