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ADT7302 Dataheets PDF



Part Number ADT7302
Manufacturers Analog Devices
Logo Analog Devices
Description MicroPower Digital Temperature Sensor
Datasheet ADT7302 DatasheetADT7302 Datasheet (PDF)

±2°C Accurate, Micropower Digital Temperature Sensor ADT7302 FEATURES 13-bit temperature-to-digital converter −40°C to +125°C operating temperature range ±2°C accuracy 0.03125°C temperature resolution Shutdown current of 1 μA Power dissipation of 0.631 mW at VDD = 3.3 V SPI- and DSP-compatible serial interface Shutdown mode Space-saving SOT-23 and MSOP packages Compatible with AD7814 APPLICATIONS Medical equipment Automotive Environmental controls Oil temperature Hydraulic systems Cell phones H.

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±2°C Accurate, Micropower Digital Temperature Sensor ADT7302 FEATURES 13-bit temperature-to-digital converter −40°C to +125°C operating temperature range ±2°C accuracy 0.03125°C temperature resolution Shutdown current of 1 μA Power dissipation of 0.631 mW at VDD = 3.3 V SPI- and DSP-compatible serial interface Shutdown mode Space-saving SOT-23 and MSOP packages Compatible with AD7814 APPLICATIONS 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 The ADT7302 is a complete temperature monitoring system available in SOT-23 and MSOP packages. It contains a band gap temperature sensor and a 13-bit ADC to monitor and digitize the temperature reading to a resolution of 0.03125°C. The ADT7302 has a flexible serial interface that allows easy interfacing to most microcontrollers. The interface is compatible with SPI®, QSPI™, and MICROWIRE™ protocols as well as DSPs. The part features a standby mode that is controlled via the serial interface. The ADT7302’s wide supply voltage range, low supply current, and SPI-compatible interface make it ideal for a variety of applications, including PCs, office equipment, automotive, and domestic appliances. FUNCTIONAL BLOCK DIAGRAM GND BAND GAP TEMPERATURE SENSOR ADT7302 13-BIT ANALOG/DIGITAL CONVERTER TEMPERATURE VALUE REGISTER SERIAL BUS INTERFACE Figure 1. VDD CS SCLK DIN DOUT 04662-001 PRODUCT HIGHLIGHTS 1. On-chip temperature sensor that allows an accurate measurement of the ambient temperature. The measurable temperature range is −40°C to +125°C. 2. Supply voltage of 2.7 V to 5.25 V. 3. Space-saving 6-lead SOT-23 and 8-lead MSOP packages. 4. Maximum temperature accuracy of ±2°C. 5. 13-bit temperature reading to 0.03125°C resolution. 6. Shutdown mode that reduces the power consumption to 4.88 μW with VDD = 3.3 V at 1 SPS. 7. Compatible with AD7814. 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 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. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2005–2011 Analog Devices, Inc. All rights reserved. ADT7302 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Product Highlights ........................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Timing Characteristics ................................................................ 4 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configurations and Function Descriptions ........................... 6 REVISION HISTORY 6/11—Rev. A to Rev. B Changed Temperature Conversion Time from 800 µs to 1.2 ms.. 3 Changed Temperature Conversion Time in Converter Details Section .................................................................................. 9 3/10—Rev. 0 to Rev. A Change to Autoconversion Update Rate Parameter, Table 1 ...... 3 Changes to Converter Details Section ........................................... 9 Updated Outline Dimensions ....................................................... 15 10/05—Revision 0: Initial Version Typical Performance Characteristics ..............................................7 Theory of Operation .........................................................................9 Converter Details ..........................................................................9 Temperature Value Register.........................................................9 Serial Interface ............................................................................ 10 Applications Information .............................................................. 12 Microprocessor Interfacing....................................................... 12 Mounting the ADT7302.............................................


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