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 mea-
sure 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 Con-
trol 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.
dBCOOL is a trademark of Analog Devices, Inc.
Intel and Pentium are registered trademarks of Intel Corp.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its use,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
nor for any infringements of patents or other rights of third parties that may
resultfromitsuse.Nolicenseisgrantedbyimplicationorotherwiseunderany
patent or patent rights of Analog Devices.
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
© Analog Devices, Inc., 2002