ADT7473 Analog Devices, Inc., ADT7473 Datasheet - Page 2

• Manufacturer Part Number: ADT7473
• Description: Dbcool Remote Thermal Monitor And Fan Controller
• Manufacturer: Analog Devices, Inc.

ADT7473
T
Fe
G
Functional Block Diagram .............................................................. 1
Sp
Ab
Pi
Ty
Product Description....................................................................... 10
ABLE OF CONTENTS
eneral Description ......................................................................... 1
n Configuration and Function Descriptions............................. 7
atures .............................................................................................. 1
Timing Diagram ........................................................................... 5
Thermal Resistance ...................................................................... 6
ESD Caution.................................................................................. 6
Comparison Between ADT7467 and ADT7473 .................... 10
How to Set the Functionality of Pin 9...................................... 10
Recommended Implementation............................................... 10
Serial Bus Interface..................................................................... 11
Write Operations ........................................................................ 12
Read Operations ......................................................................... 13
SMBus Timeout .......................................................................... 13
Voltage Measurement I
Analog-to-Digital Converter .................................................... 13
Input Circuitry.........................................................
Voltage Measurement Registers................................................ 13
V
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
ecifications..................................................................................... 4
pical Performance Characteristics ............................................. 8
solute Maximum Ratings............................................................ 6
CCP
Limit Registers ................................................................... 14
nput...................................................... 13
................... 13
Rev. A | Page 2 of 76
Li
Pr
Register Tables ................................................................................ 58
Outline Dimensions ....................................................................... 76
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
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
Step 4: PWM
Step 5: PWM
Step 6: T
Step 7: T
Step 8: T
Dynamic T
Step 9: Operating Points for Temperature Channels............. 49
Step 10: High and Low Limits for Temperature Channels ... 50
Step 11: Monitoring THERM
Enhancing System Acoustics .................................................... 53
Step 12: Ramp Rate for Acoustic Enhancement..................... 55
Ordering Guide .......................................................................... 76
MIN
RANGE
THERM
HYST
MIN
Settings for Thermal Calibration Channels
for Temperature Channels.................................. 45
MIN
MAX
for Temperature Channels................................ 41
for Temperature Channels ............................... 44
Control Mode ................................................... 47
for Each PWM (Fan) Output ...................... 40
for PWM (Fan) Outputs.............................. 40
................................................... 52
...... 38