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參數資料
| 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： | 47/88頁 |
| 文件大小： | 836K |
| 代理商： | ADT7462ACPZ-500RL7 |
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ADT7462
Rev. 2 | Page 51 of 88 | www.onsemi.com
ACOUSTIC
ENHANCEMENT
REAR CHASSIS
FRONT CHASSIS
CPU FAN SINK
LOCAL =
VRM TEMP
PWM1
PWM2
TACH1
TACH2
TACH3
PWM3
REMOTE 1 =
AMBIENT TEMP
REMOTE 2 =
CPU TEMP
MUX
THERMAL CALIBRATION
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
TACHOMETER 1
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
TACHOMETER 2
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
TACHOMETER 3
AND 4
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
100%
05
569
-0
64
Figure 75. Acoustic Enhancement Smoothes Fan Speed Variations Under Automatic Fan Speed Control
Approaches to System Acoustic Enhancement
There are two different approaches to implementing system
acoustic enhancement: temperature-centric and fan-centric.
The temperature-centric approach involves smoothing transient
temperatures as they are measured by a temperature source (for
example, Remote 1 temperature). The temperature values used
to calculate the PWM duty cycle values are smoothed, reducing
fan speed variation. However, this approach causes an inherent
delay in updating fan speed and causes the thermal characteristics
of the system to change. It also causes the system fans to stay on
longer than necessary, because the fan’s reaction is merely
delayed. The user has no control over noise from different fans
driven by the same temperature source. Consider, for example,
a system in which control of a CPU cooler fan (on PWM1) and a
chassis fan (on PWM2) uses Remote 1 temperature. Because the
Remote 1 temperature is smoothed, both fans are updated at
exactly the same rate. If the chassis fan is much louder than the
CPU fan, there is no way to improve its acoustics without
changing the thermal solution of the CPU cooling fan.
The fan-centric approach to system acoustic enhancement
controls the PWM duty cycle, driving the fan at a fixed rate
(for example, 6%). Each time the PWM duty cycle is updated,
it is incremented by a fixed 6%. As a result, the fan ramps
smoothly to its newly calculated speed. If the temperature starts
to drop, the PWM duty cycle immediately decreases by 6% at
every update. Therefore, the fan ramps smoothly up or down
without inherent system delay.
Consider, for example, controlling the same CPU cooler fan (on
PWM1) and chassis fan (on PWM2) using Remote 1 temperature.
The TMIN and TRANGE settings have already been defined in
automatic fan speed control mode; that is, thermal characteri-
zation of the control loop has been optimized. The chassis fan
is noisier than the CPU cooling fan. Using the fan-centric
approach, PWM2 can be placed into acoustic enhancement
mode independently of PWM1. The acoustics of the chassis fan
can, therefore, be adjusted without affecting the acoustic
behavior of the CPU cooling fan, even though both fans are
controlled by Remote 1 temperature. The fan-centric approach
is how acoustic enhancement works on the ADT7462.
Enabling Acoustic Enhancement for Each PWM Output
Enhanced Acoustics Register 1 (0x1A)
Bit 0 (En1) = 1 enables acoustic enhancement on PWM1
output.
Bit 1 (En2) = 1 enables acoustic enhancement on PWM2
output.
Enhanced Acoustics Register 2 (0x1B)
Bit 0 (En3) = 1 enables acoustic enhancement on PWM3
output.
Bit 1 (En4) = 1 enables acoustic enhancement on PWM4
output.
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