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ADT7467ARQ Arkusz danych(PDF) 1 Page - ON Semiconductor

Numer części ADT7467ARQ
Szczegółowy opis  dBCool Remote Thermal Monitor and Fan Controller
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dBCool Remote Thermal
Monitor and Fan Controller
ADT7467
©2008 SCILLC. All rights reserved.
Publication Order Number:
January 2008 – Rev. 3
ADT7467/D
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 intelligently optimizes
system acoustics
Automatic fan speed control mode manages 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, 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)
GENERAL DESCRIPTION
The ADT7467 dBCool® controller is a thermal monitor and
multiple PWM fan controller for noise-sensitive or power-
sensitive applications requiring active system cooling. The
ADT7467 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 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 ADT7467 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
INPUT
SIGNAL
CONDITIONING
AND
ANALOG
MULTIPLEXER
GND
SERIAL BUS
INTERFACE
SCL SDA
VALUE AND
LIMIT
REGISTERS
LIMIT
COMPARATORS
INTERRUPT
STATUS
REGISTERS
BAND GAP
TEMP SENSOR
VCC TO ADT7467
ADDRESS
POINTER
REGISTER
PWM
CONFIGURATION
REGISTERS
INTERRUPT
MASKING
VCC
D1+
D1–
D2+
D2–
VCCP
THERMAL
PROTECTION
PERFORMANCE
MONITORING
PWM REGISTERS
AND
CONTROLLERS
HF & LF
PWM1
PWM2
PWM3
ACOUSTIC
ENHANCEMENT
CONTROL
BAND GAP
REFERENCE
10-BIT
ADC
ADT7467
AUTOMATIC
FAN SPEED
CONTROL
DYNAMIC
TMIN
CONTROL
FAN SPEED
COUNTER
TACH1
TACH2
TACH3
TACH4
SRC
THERM
SMBALERT
Figure 1.


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