2C Accurate, 12-Bit Digital Temperature Sensor Data Sheet ADT7408 FEATURES FUNCTIONAL BLOCK DIAGRAM V DD 12-bit temperature-to-digital converter 8 DIGITAL COMPARATOR 12- / 10-Bit 2C accuracy 7 EVENT DECIMATOR Operation from 20C to +125C TEMPERATURE LPF + SENSOR Operation from 3 V to 3.6 V CAPABILITY REGISTER 240 A typical average supply current + Selectable 1.5C, 3C, 6C hysteresis CONFIGURATION REGISTER 2 REFERENCE SMBus-/I C-compatible interface - ALARM TEMP 1-BIT UPPER Dual-purpose event pin: comparator or interrupt DAC BOUNDARY TRIP REGISTER 8-lead LFCSP, 3 mm 3 mm (JEDEC MO-229 WEED-4) CLK ADDRESS AND TIMING ALARM TEMP POINTER GENERATION package LOWER REGISTER BOUNDARY TRIP REGISTER Complies with JEDEC standard JC-42.4 memory module MANUFACTURERS ID REGISTER CRITICAL TEMP Thermal sensor component specification REGISTER ADT7408 FACTORY TEMPERATURE RESERVED REGISTER REGISTER APPLICATIONS A0 1 5 SDA A1 2 SMBus/IC INTERFACE Memory module temperature monitoring 6 SCL A2 3 Isolated sensors 4 V ss Environmental control systems Figure 1. Computer thermal monitoring Thermal protection Industrial process control Power system monitors GENERAL DESCRIPTION The ADT7408 is the first digital temperature sensor that complies The ADT7408 is specified for operation at supply voltages from with JEDEC standard JC-42.4 for the mobile platform memory 3.0 V to 3.6 V. Operating at 3.3 V, the average supply current is module. The ADT7408 contains a band gap temperature sensor less than 240 A typical. The ADT7408 offers a shutdown mode and a 12-bit ADC to monitor and digitize the temperature to a that powers down the device and gives a shutdown current of 3 A resolution of 0.0625C. typical. The ADT7408 is rated for operation over the 20C to +125C temperature range. The ADT7408 is available in a lead- There is an open-drain EVENT output that is active when the free, 8-lead LFCSP, 3 mm 3 mm (JEDEC MO-229 WEED-4) monitoring temperature exceeds a critical programmable limit or package. when the temperature falls above or below an alarm window. This pin can operate in either comparator or interrupt mode. There are three slave device address pins that allow up to eight ADT7408s to be used in a system that monitors temperature of various components and subsystems. Rev. A Document Feedback 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 20062016 Analog Devices, Inc. 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Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 1- T BI 05716-001ADT7408 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Address Pointer Register (Write Only).................................... 10 Applications ....................................................................................... 1 Capability Register (Read Only) .............................................. 10 Functional Block Diagram .............................................................. 1 Configuration Register (Read/Write) ...................................... 11 General Description ......................................................................... 1 Temperature Trip Point Registers ............................................ 13 Revision History ............................................................................... 2 ID Registers ................................................................................. 14 Specifications ..................................................................................... 3 Temperature Data Format ......................................................... 15 Timing Characteristics ................................................................ 4 Event Pin Functionality ............................................................. 16 Timing Diagram ........................................................................... 4 Serial Interface ............................................................................ 17 2 Absolute Maximum Ratings ............................................................ 5 SMBus/I C Communications ................................................... 18 ESD Caution .................................................................................. 5 Applications information .............................................................. 21 Pin Configuration and Function Descriptions ............................. 6 Thermal Response Time ........................................................... 21 Typical Performance Characteristics ............................................. 7 Self-Heating Effects .................................................................... 21 Theory of Operation ........................................................................ 8 Supply Decoupling ..................................................................... 21 Circuit Information ...................................................................... 8 Temperature Monitoring ........................................................... 21 Converter Details.......................................................................... 8 Outline Dimensions ....................................................................... 22 Modes of Operation ..................................................................... 8 Ordering Guide .......................................................................... 22 Registers ........................................................................................... 10 REVISION HISTORY 6/2016Rev. 0 to Rev. A Changed CP-8-2 to CP-8-13 ........................................ Throughout Changes to Figure 4 .......................................................................... 6 Updated Outline Dimensions ....................................................... 22 Changes to Ordering Guide .......................................................... 22 3/2006Revision 0: Initial Version Rev. A Page 2 of 22