EVAL-ADT7460EB 查看數據表（PDF） - Analog Devices
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EVAL-ADT7460EB Datasheet PDF : 52 Pages
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dBCOOL™ Remote Thermal
Controller and Fan Controller
ADT7460
FEATURES
GENERAL DESCRIPTION
Controls and monitors up to 4 fan speeds
1 on-chip and 2 remote temperature sensors
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)
The ADT74601 dBCOOL controller is a thermal monitor and
multiple PWM fan controller for noise-sensitive applications
requiring active system cooling. It can monitor the temperature
of up to two remote sensor diodes plus its own internal temp-
erature. 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
ADT7460 also provides critical thermal protection to the
system by 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
ADDR
SELECT ADDR_EN
SCL SDA SMBALERT
PWM1
PWM2
PWM3
TACH1
TACH2
TACH3
TACH4
THERM
VCC
D1+
D1–
D2+
D2–
+2.5VIN
PWM REGISTERS
AND
CONTROLLERS
VCC TO ADT7460
BAND GAP
TEMP SENSOR
SMBUS
ADDRESS
SELECTION
SERIAL BUS
INTERFACE
ACOUSTIC
ENHANCEMENT
CONTROL
AUTOMATIC
FAN SPEED
CONTROL
ADDRESS
POINTER
REGISTER
FAN SPEED
COUNTER
PERFORMANCE
MONITORING
DYNAMIC
TMIN
CONTROL
PWM
CONFIGURATION
REGISTERS
INTERRUPT
MASKING
THERMAL
PROTECTION
ADT7460
INPUT
SIGNAL
CONDITIONING
AND
ANALOG
MULTIPLEXER
10-BIT
ADC
BAND GAP
REFERENCE
GND
INTERRUPT
STATUS
REGISTERS
LIMIT
COMPARATORS
VALUE AND
LIMIT
REGISTERS
Figure 1.
1Protected 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 may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.
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