0.5C Accurate, 16-Bit Digital SPI Temperature Sensor Data Sheet ADT7310 FEATURES Thermal protection Industrial process control High performance Power system monitors Temperature accuracy Hand-held applications 0.5C from 40C to +105C (2.7 V to 3.6 V) 0.4C from 40C to +105C (3.0 V) GENERAL DESCRIPTION 16-bit temperature resolution: 0.0078C The ADT7310 is a high accuracy digital temperature sensor Fast first temperature conversion on power-up of 6 ms in a narrow SOIC package. It contains a band gap temperature Easy implementation reference and a 13-bit ADC to monitor and digitize the No temperature calibration/correction required by user temperature to a 0.0625C resolution. The ADC resolution, No linearity correction required by default, is set to 13 bits (0.0625 C). This can be changed Low power to 16 bits (0.0078 C) by setting Bit 7 in the configuration Power saving 1 sample per second (SPS) mode register (Register Address 0x01). 700 W typical at 3.3 V in normal mode 7 W typical at 3.3 V in shutdown mode The ADT7310 is guaranteed to operate over supply voltages from Wide operating ranges 2.7 V to 5.5 V. Operating at 3.3 V, the average supply current is Temperature range: 55C to +150C typically 210 A. The ADT7310 has a shutdown mode that Voltage range: 2.7 V to 5.5 V powers down the device and offers a shutdown current of Programmable interrupts typically 2 A. The ADT7310 is rated for operation over the Critical overtemperature interrupt 55C to +150C temperature range. Overtemperature/undertemperature interrupt SPI-compatible interface The CT pin is an open-drain output that becomes active when 8-lead narrow SOIC RoHS-compliant package the temperature exceeds a programmable critical temperature limit. The default critical temperature limit is 147C. The INT APPLICATIONS pin is also an open-drain output that becomes active when the Medical equipment temperature exceeds a programmable limit. The INT and CT Environmental control systems pins can operate in either comparator or interrupt mode. Computer thermal monitoring FUNCTIONAL BLOCK DIAGRAM 1 SCLK ADT7310 INTERNAL 2 DOUT OSCILLATOR INTERNAL 3 DIN REFERENCE 6 CT 4 T CS CRIT - TEMPERATURE MODULATOR TEMPERATURE SENSOR CONFIGURATION 5 INT VALUE AND STATUS REGISTER REGISTERS T HIGH T T HYST CRIT FILTER REGISTER REGISTER LOGIC 7 GND T LOW T T HIGH LOW REGISTER REGISTER 8 V DD Figure 1. Rev. A 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. Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 20092011 Analog Devices, Inc. All rights reserved. SPI INTERFACE 07789-001ADT7310 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Status Register ............................................................................. 14 Applications ....................................................................................... 1 Configuration Register .............................................................. 15 General Description ......................................................................... 1 Temperature Value Register ...................................................... 16 Functional Block Diagram .............................................................. 1 ID Register................................................................................... 16 Revision History ............................................................................... 2 T Setpoint Register ............................................................... 16 CRIT Specifications ..................................................................................... 3 THYST Setpoint Register ............................................................... 17 SPI Timing Specifications ........................................................... 4 THIGH Setpoint Register .............................................................. 17 Absolute Maximum Ratings ............................................................ 5 TLOW Setpoint Register ............................................................... 17 ESD Caution .................................................................................. 5 Serial Interface ................................................................................ 18 Pin Configuration and Function Descriptions ............................. 6 SPI Command Byte .................................................................... 18 Typical Performance Characteristics ............................................. 7 Writing Data ............................................................................... 19 Theory of Operation ........................................................................ 9 Reading Data ............................................................................... 20 Circuit Information ...................................................................... 9 Interfacing to DSPs or Microcontrollers ................................. 20 Converter Details.......................................................................... 9 Serial Interface Reset .................................................................. 20 Temperature Measurement ......................................................... 9 INT and CT Outputs ...................................................................... 21 One-Shot Mode .......................................................................... 10 Undertemperature and Overtemperature Detection ............ 21 1 SPS Mode .................................................................................. 10 Applications Information .............................................................. 23 Continuous Read Mode ............................................................. 12 Thermal Response Time ........................................................... 23 Shutdown ..................................................................................... 12 Supply Decoupling ..................................................................... 23 Fault Queue ................................................................................. 12 Temperature Monitoring ........................................................... 23 Temperature Data Format ......................................................... 13 Outline Dimensions ....................................................................... 24 Temperature Conversion Formulas ......................................... 13 Ordering Guide .......................................................................... 24 Registers ........................................................................................... 14 REVISION HISTORY 12/11Rev. 0 to Rev. A Changes to Table 7 .......................................................................... 14 Changes to Features Section............................................................ 1 Changes to Table 8 .......................................................................... 15 Changes to Table 1 ............................................................................ 3 Changes to Table 9 .......................................................................... 16 Changes to Figure 6 and Figure 9 ................................................... 7 Changes to Table 12, Table 13, and Table 14 ............................... 17 Changes to Figure 11 ........................................................................ 8 Changes to Ordering Guide .......................................................... 24 Changes to One-Shot Mode Section and 1 SPS Mode Section .............................................................................................. 10 4/09Revision 0: Initial Version Changes to Shutdown Section and Figure 16 ............................. 12 Rev. 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