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ADT7473 Datasheet(PDF) 1 Page - Analog Devices

Part No. ADT7473
Description  dBCool Remote Thermal Monitor and Fan Controller
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

ADT7473 Datasheet(HTML) 1 Page - Analog Devices

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dBCool® Remote Thermal
Monitor and Fan Controller
ADT7473
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
©2006 Analog Devices, Inc. All rights reserved.
FEATURES
Controls and monitors up to 4 fans
High and low frequency fan drive signal
1 on-chip and 2 remote temperature sensors
Series resistance cancellation on the remote channel
Extended temperature measurement range, up to 191°C
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
3-wire and 4-wire fan speed measurement
Limit comparison of all monitored values
Meets SMBus 2.0 electrical specifications
(fully SMBus 1.1 compliant)
Fully ROHS compliant
GENERAL DESCRIPTION
The ADT7473 dBCool controller is a thermal monitor and
multiple PWM fan controller for noise sensitive or power
sensitive applications requiring active system cooling. The
ADT7473 can drive a fan using either a low or high frequency
drive signal, monitor the temperature of up to two remote
sensor diodes plus its own internal temperature, and measure
and control the speed of up to four fans so 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 ADT7473 also
provides critical thermal protection to the system using the
bidirectional THERM pin as an output to prevent system or
component overheating.
FUNCTIONAL BLOCK DIAGRAM
BAND GAP
EFERENCE
VALUE AND
R
10-BIT
ADC
LIMIT
REGISTERS
LIMIT
COMPARATORS
INTERRUPT
STATUS
REGISTERS
GND
PWM1
PWM2
AU
FAN SPEED
C
PWM3
PWM
REGISTERS
AND
CONTROLLERS
(HF AND LF)
ACOUSTIC
ENHANCEM NT
E
CONTROL
TOMATIC
ONTROL
D
C
YNAMIC
TMIN
ONTROL
TACH1
TACH2
TACH3
TACH4
FAN
SPEED
COUNTER
THERMAL
PROTECTION
PERFORMANC
MONITORING
E
THERM
INPUT
SIGNAL
CONDITION G
IN
AND
ANALOG
MULTIPLEXER
VCC TO ADT7473
VCC
D1+
D1–
D2+
D2–
VCCP
BAND GAP
TEMP SENSOR
SRC
INTERRUPT
MASKING
PWM
CONFIGURATION
REGISTERS
ADDRESS
POINTER
REGISTER
SERIAL BUS
INTERFACE
SCL SDA SMBALERT
ADT7473
Figure 1.


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