ADT7467 Analog Devices, Inc., ADT7467 Datasheet - Page 2

• Manufacturer Part Number: ADT7467
• Description: Dbcool Remote Thermal Monitor And Fan Controller
• Manufacturer: Analog Devices, Inc.

ADT7467
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 7
Product Description......................................................................... 9
Serial Bus Interface......................................................................... 11
Analog-to-Digital Converter ........................................................ 15
Limits, Status Registers, and Interrupts....................................... 21
Active Cooling ................................................................................ 27
REVISION HISTORY
7/05—Rev. 0 to Rev. A
Change to Absolute Maximum Ratings......................................... 5
Change to Recommended Implementation Section.................. 39
Changes to Recommended Implementation Figure .................. 39
Deleted Recommended Implementation 2 Section ................... 39
Deleted Recommended Implementation 2 Figure..................... 39
Change to Table 17 ......................................................................... 59
Changes to Ordering Guide .......................................................... 78
Revision 0: Initial Version
Thermal Characteristics .............................................................. 5
ESD Caution.................................................................................. 5
Comparison Between ADT7460 and ADT7467 ...................... 9
Recommended Implementation............................................... 10
Write Operations ........................................................................ 13
Read Operations ......................................................................... 13
SMBus Timeout .......................................................................... 14
Voltage Measurement Input...................................................... 15
Additional ADC Functions for Voltage Measurements ........ 15
Temperature Measurement ....................................................... 16
Additional ADC Functions for Temperature Measurement 20
Limit Values................................................................................. 21
Status Registers ........................................................................... 22
Interrupts..................................................................................... 22
Driving the Fan Using PWM Control ..................................... 27
Laying Out 2-Wire and 3-Wire Fans ....................................... 29
Fan Speed Measurement............................................................ 30
Rev. A | Page 2 of 80
Miscellaneous Functions ............................................................... 34
Automatic Fan Control Overview................................................ 35
Programming the Automatic FanSpeed Control Loop ............. 38
Enhancing System Acoustics ........................................................ 57
Register Map ................................................................................... 59
ADT7467 Programming Block Diagram .................................... 77
Outline Dimensions ....................................................................... 78
Fan Spin-Up ................................................................................ 32
PWM Logic State........................................................................ 32
Fan Speed Control...................................................................... 33
Operating from 3.3 V Standby ................................................. 34
XNOR Tree Test Mode .............................................................. 34
Power-On Default ...................................................................... 34
Dynamic T
Step 1: Hardware Configuration .............................................. 38
Step 2: Configuring the Mux .................................................... 40
Step 3: T
Step 4: PWM
Step 5: PWM
Step 6: T
Step 7: T
Step 8: T
Step 9: Operating Points for Temperature Channels............. 50
Step 10: High and Low Limits for Temperature Channels ... 51
Step 11: Monitoring THERM ................................................... 53
Step 12: Ramp Rate for Acoustic Enhancement..................... 54
Acoustic Enhancement Mode Overview ................................ 57
Ordering Guide .......................................................................... 78
MIN
RANGE
THERM
HYST
MIN
Settings for Thermal Calibration Channels ...... 42
for Temperature Channels.................................. 48
MIN
MAX
for Temperature Channels................................ 44
for Temperature Channels ............................... 47
Control Mode ................................................... 36
for PWM (Fan) Outputs .............................. 43
for PWM (Fan) Outputs.............................. 43