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ADT7490 Datasheet(PDF) 3 Page - Analog Devices

No. de pieza ADT7490
Descripción Electrónicos  dBCool Remote Thermal Monitor and Fan Controller with PECI Interface
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
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ADT7490 Datasheet(HTML) 3 Page - Analog Devices

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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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