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ADT7473 Datasheet(PDF) 2 Page - Analog Devices

Part No. ADT7473
Description  dBCool Remote Thermal Monitor and Fan Controller
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

ADT7473 Datasheet(HTML) 2 Page - Analog Devices

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ADT7473
Rev. A | Page 2 of 76
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Serial Bus Interface..................................................................... 11
Write Operations ........................................................................ 12
Read Operations ......................................................................... 13
SMBus Timeout .......................................................................... 13
nput...................................................... 13
................... 13
VCCP Limit Registers ................................................................... 14
Additional ADC Functions for Voltage Measurements ........ 14
Temperature Measurement Method ........................................ 15
Series Resistance Cancellation.................................................. 17
Factors Affecting Diode Accuracy ........................................... 17
Additional ADC Functions for Temperature Measurement 19
Li
ABLE OF CONTENTS
atures .............................................................................................. 1
eneral Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
ecifications..................................................................................... 4
Timing Diagram ........................................................................... 5
solute Maximum Ratings............................................................ 6
Thermal Resistance ...................................................................... 6
ESD Caution.................................................................................. 6
n Configuration and Function Descriptions............................. 7
pical Performance Characteristics ............................................. 8
Product Description....................................................................... 10
Comparison Between ADT7467 and ADT7473 .................... 10
How to Set the Functionality of Pin 9...................................... 10
Recommended Implementation............................................... 10
Voltage Measurement I
Analog-to-Digital Converter .................................................... 13
Input Circuitry.........................................................
Voltage Measurement Registers................................................ 13
mits, Status Registers, and Interrupts....................................... 20
Limit Values ................................................................................ 20
Interrupt Status Registers .......................................................... 21
THERM Timer ........................................................................... 23
Fan Presence Detect................................................................... 31
Sleep States .................................................................................. 31
XNOR Tree Test Mode .............................................................. 31
Power-On Default ...................................................................... 31
Pr
Step 4: PWMMIN for Each PWM (Fan) Output ...................... 40
Step 5: PWMMAX for PWM (Fan) Outputs.............................. 40
Step 6: TRANGE for Temperature Channels................................ 41
ogramming the Automatic Fan Speed Control Loop ............ 33
Automatic Fan Control Overview............................................ 33
Step 1: Hardware Configuration .............................................. 34
Step 2: Configuring the Mux .................................................... 36
Step 3: T
Settings for Thermal Calibration Channels
MIN
...... 38
Step 7: T
THERM for Temperature Channels ............................... 44
Step 8: THYST for Temperature Channels.................................. 45
Step 10: High and Low Limits for Temperature Channels ... 50
Step 11: Monitoring THERM
Dynamic TMIN Control Mode ................................................... 47
Step 9: Operating Points for Temperature Channels............. 49
................................................... 52
Enhancing System Acoustics .................................................... 53
Step 12: Ramp Rate for Acoustic Enhancement..................... 55
Register Tables ................................................................................ 58
Outline Dimensions ....................................................................... 76
Ordering Guide .......................................................................... 76


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