1C Accurate, 13-Bit, Digital Temperature Sensor ADT7301 FEATURES FUNCTIONAL BLOCK DIAGRAM 13-bit temperature-to-digital converter BAND GAP 13-BIT 40C to +150C operating temperature range TEMPERATURE ANALOG/DIGITAL 0.5C typical accuracy SENSOR CONVERTER 0.03125C temperature resolution GND V DD Shutdown current of 1 A TEMPERATURE ADT7301 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 Cellular phones Hard disk drives Personal computers Electronic test equipment Office equipment Domestic appliances Process control GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The ADT7301 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 +150C. the temperature reading to a resolution of 0.03125C. 2. Supply voltage of 2.7 V to 5.25 V. The ADT7301 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 compati- ble with SPI, QSPI, and MICROWIRE protocols as well as 4. Typical temperature accuracy of 0.5C. DSPs. The part features a standby mode that is controlled via 5. 13-bit temperature reading to 0.03125C resolution. the serial interface. The ADT7301s wide supply voltage range, low supply current, and SPI-compatible interface make it ideal 6. Shutdown mode that reduces the power consumption to for a variety of applications including personal computers, 4.88 W with V = 3.3 V 1 SPS. DD office equipment, automotive, and domestic appliances. The ADT7301 is rated for operation over the 40C to +150C 7. Compatible with AD7814. temperature range. It is not recommended to operate the device at temperatures above +125C for greater than a total of 5% (5,000 hours) of the lifetime of the device. Exposure beyond this limit affects device reliability. 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. 02884-0-001ADT7301 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 ...................................................... 10 Product Highlights ........................................................................... 1 Serial Interface ............................................................................ 11 Revision History ............................................................................... 2 Applications Information .............................................................. 12 Specifications ..................................................................................... 3 Microprocessor Interfacing ....................................................... 12 Timing Characteristics ................................................................ 4 Mounting the ADT7301 ............................................................ 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