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ADT7490 Datasheet(PDF) 3 Page - Analog Devices |
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ADT7490 Datasheet(HTML) 3 Page - Analog Devices |
3 / 76 page ADT7490 Rev. 0 | Page 3 of 76 TABLE OF CONTENTS Features...............................................................................................1 Applications .......................................................................................1 General Description..........................................................................1 Functional Block Diagram ...............................................................2 Revision History ................................................................................3 Specifications .....................................................................................4 Absolute Maximum Ratings ............................................................6 Thermal Characteristics...............................................................6 ESD Caution ..................................................................................6 Pin Configuration and Function Descriptions .............................7 Typical Performance Characteristics ..............................................9 Theory of Operation .......................................................................12 Feature Comparisons Between the ADT7490 and ADT7476A .......................................................................................................12 Start-Up Operation .....................................................................13 Serial Bus Interface .....................................................................13 Write Operations.........................................................................14 Read Operations..........................................................................15 SMBus Timeout...........................................................................16 Voltage Measurement Input.......................................................16 Additional ADC Functions for Voltage Measurements.........17 Temperature Measurement........................................................19 Thermal Diode Temperature Measurement Method.............21 Series Resistance Cancellation ..................................................22 Factors Affecting Diode Accuracy............................................22 Additional ADC Functions for Temperature Measurement .23 Limits, Status Registers, and Interrupts .......................................25 Limit Values .................................................................................25 Interrupt Status Registers...........................................................26 THERM Timer ............................................................................28 Fan Drive Using PWM Control ................................................30 Laying Out 3-Wire Fans.............................................................32 Programming Trange .....................................................................35 Programming the Automatic Fan Speed Control loop ..............36 Manual Fan Control Overview .................................................36 THERM Operation in Manual Mode.......................................36 Automatic Fan Control Overview ............................................36 Step 1: Hardware Configuration ...............................................37 Step 2: Configuring the Muxtiplexer........................................37 Step 3: TMIN Settings for Thermal Calibration Channels .......38 Step 4: PWMMIN for Each PWM (Fan) Output .......................40 Step 5: PWMMAX for PWM (Fan) Outputs...............................40 Step 6: TRANGE for Temperature Channels ................................41 Step 7: T THERM for Temperature Channels ................................43 Step 8: THYST for Temperature Channels...................................44 Programming the GPIOs ...........................................................46 XNOR Tree Test Mode ...............................................................46 Register Tables .................................................................................47 Outline Dimensions........................................................................76 Ordering Guide ...........................................................................76 REVISION HISTORY 7/07—Revision 0: Initial Version |
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