ADT7463 Datasheet, PDF (1/52 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)
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 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 T_MIN 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.
APPLICATIONS
Low Acoustic Noise PCs
Networking and Telecommunications Equipment
FUNCTIONAL BLOCK DIAGRAM
VID5
VID4
VID3
VID2
VID1
VID0
PWM1
PWM2
PWM3
TACH1
TACH2
TACH3
TACH4
ADDR
SELECT ADDR EN SCL SDA SMBALERT
PWM
REGISTERS
AND
CONTROLLERS
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
THERM
V_CC
D1+
D1–
D2+
D2–
V_CC
+5V_IN
+12V_IN
+2.5V_IN
V_CCP
V_CC TO ADT7463
BAND GAP
TEMP. SENSOR
THERMAL
PROTECTION
ADT7463
INPUT
SIGNAL
CONDITIONING
AND
ANALOG
MULTIPLEXER
10-BIT
ADC
BAND GAP
REFERENCE
GND
INTERRUPT
STATUS
REGISTERS
LIMIT
COMPARATORS
VALUE AND
LIMIT
REGISTERS
*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, nor for any infringements of patents or other rights of third parties that
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