2C Accurate, Micropower Digital Temperature Sensor ADT7302 FEATURES FUNCTIONAL BLOCK DIAGRAM 13-bit temperature-to-digital converter BAND GAP 13-BIT 40C to +125C operating temperature range TEMPERATURE ANALOG/DIGITAL 2C accuracy SENSOR CONVERTER 0.03125C temperature resolution GND V DD Shutdown current of 1 A TEMPERATURE ADT7302 VALUE Power dissipation of 0.631 mW at V = 3.3 V DD REGISTER SPI- and DSP-compatible serial interface Shutdown mode CS SERIAL SCLK Space-saving SOT-23 and MSOP packages BUS DIN INTERFACE Compatible with AD7814 DOUT APPLICATIONS Figure 1. Medical equipment Automotive Environmental controls Oil temperature Hydraulic systems Cell phones Hard disk drives Personal computers Electronic test equipment Office equipment Domestic appliances Process control GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The ADT7302 is a complete temperature monitoring system 1. On-chip temperature sensor that allows an accurate available in SOT-23 and MSOP packages. It contains a band gap measurement of the ambient temperature. The measurable temperature sensor and a 13-bit ADC to monitor and digitize temperature range is 40C to +125C. the temperature reading to a resolution of 0.03125C. 2. Supply voltage of 2.7 V to 5.25 V. The ADT7302 has a flexible serial interface that allows easy 3. Space-saving 6-lead SOT-23 and 8-lead MSOP packages. interfacing to most microcontrollers. The interface is compatible with SPI, QSPI, and MICROWIRE protocols as well as DSPs. 4. Maximum temperature accuracy of 2C. The part features a standby mode that is controlled via the serial interface. 5. 13-bit temperature reading to 0.03125C resolution. The ADT7302s wide supply voltage range, low supply current, 6. Shutdown mode that reduces the power consumption to 4.88 W with V = 3.3 V at 1 SPS. and SPI-compatible interface make it ideal for a variety of DD applications, including PCs, office equipment, automotive, and 7. Compatible with AD7814. domestic appliances. Rev. B 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 20052011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 04662-001ADT7302 TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................7 Applications ....................................................................................... 1 Theory of Operation .........................................................................9 Functional Block Diagram .............................................................. 1 Converter Details ..........................................................................9 General Description ......................................................................... 1 Temperature Value Register .........................................................9 Product Highlights ........................................................................... 1 Serial Interface ............................................................................ 10 Revision History ............................................................................... 2 Applications Information .............................................................. 12 Specifications ..................................................................................... 3 Microprocessor Interfacing ....................................................... 12 Timing Characteristics ................................................................ 4 Mounting the ADT7302 ............................................................ 14 Absolute Maximum Ratings ............................................................ 5 Supply Decoupling ..................................................................... 14 ESD Caution .................................................................................. 5 Outline Dimensions ....................................................................... 15 Pin Configurations and Function Descriptions ........................... 6 Ordering Guide .......................................................................... 15 REVISION HISTORY 6/11Rev. A to Rev. B Changed Temperature Conversion Time from 800 s to 1.2 ms .. 3 Changed Temperature Conversion Time in Converter Details Section .................................................................................. 9 3/10Rev. 0 to Rev. A Change to Autoconversion Update Rate Parameter, Table 1 ...... 3 Changes to Converter Details Section ........................................... 9 Updated Outline Dimensions ....................................................... 15 10/05Revision 0: Initial Version Rev. B Page 2 of 16