ADT7463 Datasheet, PDF (1/53 Pages) Analog Devices – dB COOL Remote Thermal Controller and Voltage Monitor

a
dBCOOL^™ Remote Thermal
Controller and Voltage Monitor
ADT7463^*
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
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.
VID5
VID4
VID3
VID2
VID1
VID0
PWM1
PWM2
PWM3
TACH1
TACH2
TACH3
TACH4
THERM
V_CC
D1+
D1–
D2+
D2–
V_CC
+5V_IN
+12V_IN
+2.5V_IN
V_CCP
FUNCTIONAL BLOCK DIAGRAM
ADDR
SELECT ADDR EN SCL SDA SMBALERT
PWM
REGISTERS
AND
CONTROLLERS
V_CC TO ADT7463
BAND GAP
TEMP. SENSOR
VID
REGISTER
ACOUSTIC
ENHANCEMENT
CONTROL
FAN SPEED
COUNTER
PERFORMANCE
MONITORING
SMBUS
ADDRESS
SELECTION
SERIAL BUS
INTERFACE
AUTOMATIC
FAN SPEED
CONTROL
ADDRESS
POINTER
REGISTER
DYNAMIC
T_MIN
CONTROL
PWM
CONFIGURATION
REGISTERS
INTERRUPT
MASKING
THERMAL
PROTECTION
ADT7463
INTERRUPT
STATUS
REGISTERS
INPUT
SIGNAL
CONDITIONING
AND
ANALOG
MULTIPLEXER
10-BIT
ADC
BAND GAP
REFERENCE
LIMIT
COMPARATORS
VALUE AND
LIMIT
REGISTERS
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,
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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© Analog Devices, Inc., 2002