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reliable. However, no responsibility is assumed by Analog Devices for its use,
nor for any infringements of patents or other rights of third parties that may
result from its use. No license is granted by implication or otherwise under any
patent or patent rights of Analog Devices.
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Tel: 781/329-4700 www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 2002
ADT7463
*
dBCOOL
™
Remote Thermal
Controller and Voltage Monitor
FEATURES
Monitors up to 5 Supply Voltages
Controls and Monitors up to 4 Fan Speeds
1 On-Chip and 2 Remote Temperature Sensors
Monitors up to 6 Processor VID Bits
Dynamic T
MIN
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
BAND GAP
REFERENCE
10-BIT
ADC
INPUT
SIGNAL
CONDITIONING
AND
ANALOG
MULTIPLEXER
GND
SERIAL BUS
INTERFACE
SCL SDA
ADDRESS
POINTER
REGISTER
ADT7463
VALUE AND
LIMIT
REGISTERS
LIMIT
COMPARATORS
PWM
CONFIGURATION
REGISTERS
INTERRUPT
STATUS
REGISTERS
BAND GAP
TEMP. SENSOR
V
CC
TO ADT7463
INTERRUPT
MASKING
SMBALERT
V
CC
SMBUS
ADDRESS
SELECTION
ADDR EN
ADDR
SELECT
THERMAL
PROTECTION
PERFORMANCE
MONITORING
THERM
PWM
REGISTERS
AND
CONTROLLERS
PWM1
PWM2
PWM3
ACOUSTIC
ENHANCEMENT
CONTROL
AUTOMATIC
FAN SPEED
CONTROL
DYNAMIC
T
MIN
CONTROL
FAN SPEED
COUNTER
TACH1
TACH2
TACH3
TACH4
D1+
D1–
D2+
D2–
V
CC
+5V
IN
+12V
IN
+2.5V
IN
V
CCP
VID
REGISTER
VID5
VID4
VID3
VID2
VID1
VID0
GENERAL DESCRIPTION
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 T
MIN
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.
*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.