參數(shù)資料
型號： ADT7462ACPZ-500RL7
廠商： ON SEMICONDUCTOR
元件分類： 溫度/濕度傳感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 4Cel, SQUARE, SURFACE MOUNT
封裝： 5 X 5 MM, LFCSP-32
文件頁數(shù)： 31/88頁
文件大?。?/td> 836K
代理商： ADT7462ACPZ-500RL7
ADT7462
Rev. 2 | Page 37 of 88 | www.onsemi.com
PROGRAMMING THE AUTOMATIC FAN SPEED
CONTROL LOOP
Note that to better understand the automatic fan speed control
loop, use of the ADT7462 evaluation board and software is
strongly recommended while reading this section.
This section provides the system designer with an understanding
of the automatic fan control loop and provides step-by-step
guidance on effectively evaluating and selecting critical system
parameters. To optimize system characteristics, the designer
needs to carefully plan system configuration, including the
number of fans, where they are located, and what temperatures
are being measured in the particular system.
The mechanical or thermal engineer who is tasked with the
system thermal characterization should also be involved at the
beginning of the process.
Automatic Fan Control Overview
The ADT7462 can automatically control the speed of fans based
upon the measured temperature. This is done independently
from CPU intervention once initial parameters are set up.
The ADT7462 has a local temperature sensor and up to three
remote temperature channels that can be connected to a CPU
on-chip thermal diode (available on Intel Pentium class and
other CPUs/GPUs). These four temperature channels can be
used as the basis for automatic fan speed control to drive fans
using pulse-width modulation (PWM).
Automatic fan speed control reduces acoustic noise by
optimizing fan speed according to accurately measured
temperature. Reducing fan speed can also decrease system
current consumption. The automatic fan speed control mode
is very flexible, owing to the number of programmable
parameters, including TMIN and TRANGE. The TMIN and TRANGE
values for a temperature channel and, therefore, for a given fan,
are critical because they define the thermal characteristics of the
system. The thermal validation of the system is one of the most
important steps in the design process, so these values should be
selected carefully.
Figure 52 gives a top-level overview of the automatic fan control
circuitry on the ADT7462. From a systems-level perspective, up
to four system temperatures can be monitored and used to
control four PWM outputs. The four PWM outputs can be used
to control up to eight fans. The ADT7462 allows the speed of
eight fans to be monitored. The Remote 1 and Remote 2
temperature channels have a thermal calibration block, allowing
the designer to individually configure the thermal characteristics of
those temperature channels. For example, the CPU fan can be
run when CPU temperature increases above 60°C and a chassis
fan can be run when the local temperature increases above
45°C. At this stage, the designer has not assigned these thermal
calibration settings to a particular fan drive (PWM) channel.
The right side of Figure 52 shows controls that are fan-specific.
The designer has control over individual parameters such as
minimum PWM duty cycle, fan speed failure thresholds, and
even ramp control of the PWM outputs. Automatic fan control,
then, ultimately allows graceful fan speed changes that are less
perceptible to the system user.
MUX
THERMAL CALIBRATION
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
REMOTE 1
TEMP
LOCAL
TEMP
REMOTE 2
TEMP
TACHOMETER 1
MEASUREMENT
PWM
CONFIG
PWM
MIN
PWM1
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
TACHOMETER 2
MEASUREMENT
PWM
CONFIG
PWM
MIN
PWM2
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
TACHOMETER 3
AND 4
MEASUREMENT
PWM
CONFIG
PWM
MIN
PWM3
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
100%
TACH1
TACH2
TACH3
05569
-0
40
Figure 52. Automatic Fan Control Block Diagram
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