dBCOOL™ Remote Thermal
a
Controller and Voltage Monitor
ADT7463*
FEATURES
GENERAL DESCRIPTION
Monitors up to 5 Supply Voltages
The ADT7463 dBCOOL controller is a complete systems
monitor and multiple PWM fan controller for noise-sensitive
applications requiring active system cooling. It can monitor
12 V, 5 V, and 2.5 V CPU supply voltages, plus its own supply
voltage. It can monitor the temperature of up to two remote
sensor diodes, plus its own internal temperature. It can measure
and control the speed of up to four fans so that they operate at the
lowest possible speed for minimum acoustic noise. The automatic
fan speed control loop optimizes fan speed for a given temperature.
A unique dynamic TMIN control mode enables the system
thermals/acoustics to be intelligently managed. The effectiveness
of the system’s thermal solution can be monitored using the
THERM input. The ADT7463 also provides critical thermal
protection to the system using the bidirectional THERM pin
as an output to prevent system or component overheating.
Controls and Monitors up to 4 Fan Speeds
1 On-Chip and 2 Remote Temperature Sensors
Monitors up to 6 Processor VID Bits
Dynamic TMIN Control Mode Optimizes System
Acoustics Intelligently
Automatic Fan Speed Control Mode Controls System
Cooling Based on Measured Temperature
Enhanced Acoustic Mode Dramatically Reduces User
Perception of Changing Fan Speeds
Thermal Protection Feature via THERM Output
Monitors Performance Impact of Intel® Pentium®
4
Processor Thermal Control Circuit via THERM Input
2-Wire and 3-Wire Fan Speed Measurement
Limit Comparison of All Monitored Values
Meets SMBus 2.0 Electrical Specifications
(Fully SMBus 1.1 Compliant)
APPLICATIONS
Low Acoustic Noise PCs
Networking and Telecommunications Equipment
FUNCTIONAL BLOCK DIAGRAM
ADDR
SELECT ADDR EN
SCL SDA SMBALERT
VID5
VID4
VID3
VID2
VID1
VID0
VID
SMBUS
ADDRESS
SELECTION
SERIAL BUS
INTERFACE
REGISTER
ADDRESS
POINTER
REGISTER
AUTOMATIC
FAN SPEED
CONTROL
PWM1
PWM2
PWM
REGISTERS
AND
ACOUSTIC
ENHANCEMENT
CONTROL
CONTROLLERS
PWM3
PWM
CONFIGURATION
REGISTERS
DYNAMIC
MIN
CONTROL
TACH1
TACH2
TACH3
TACH4
T
FAN SPEED
COUNTER
INTERRUPT
MASKING
PERFORMANCE
MONITORING
THERMAL
PROTECTION
INTERRUPT
STATUS
REGISTERS
THERM
V
TO ADT7463
CC
V
CC
ADT7463
D1+
D1–
D2+
D2–
LIMIT
COMPARATORS
10-BIT
ADC
INPUT
SIGNAL
V
CC
CONDITIONING
AND
+5V
+12V
+2.5V
V
IN
IN
IN
VALUE AND
LIMIT
REGISTERS
ANALOG
MULTIPLEXER
BAND GAP
REFERENCE
CCP
BAND GAP
TEMP. SENSOR
GND
*Protected by U.S. Patent Nos. 6,188,189; 6,169,442; 6,097,239; 5,982,221; and 5,867,012. Other patents pending.
REV. C
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
may result from its use. No license is granted by implication or otherwise
©2008 SCILLC. All rights reserved.
Publication Order Number:
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
© 2004 Analog Devices, Inc. All rights reserved.
under any patent or patent rights of Analog Devices. Trademarks and
January 2008 -Rev. 4
ADT7463/D
registered trademarks are the property of their respective owners.
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