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參數資料
| 型號： | ADM1027ARQZ-RL7 |
| 廠商： | ON Semiconductor |
| 文件頁數： | 31/56頁 |
| 文件大小： | 1822K |
| 描述： | IC REMOTE THERMAL CTLR 24QSOP |
| 產品變化通告： | MFG CHG Notification ADI to ON Semi Product Discontinuation Notice 25/Aug/2008 Product Obsolescence 30/Sept/2009 |
| 標準包裝： | 1,000 |
| 系列： | dBCool® |
| 功能： | 風扇控制，溫度監控器 |
| 傳感器類型： | 內部和外部 |
| 感應溫度： | 0°C ~ 105°C，外部傳感器 |
| 精確度： | ±1°C |
| 拓撲： | ADC，比較器，風扇速度計數器，多路復用器，寄存器庫 |
| 輸出類型： | SMBus? |
| 輸出警報： | 無 |
| 輸出風扇： | 是 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | 0°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SSOP（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 24-QSOP |
| 包裝： | 帶卷 (TR) |
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REV. A
ADM1027
31
Step 4
Determine PWM
MIN
for Each PWM (Fan) Output
PWM
MIN
is the minimum PWM duty cycle that each fan in the
system will run at. It is also the start speed for each fan under
automatic fan control once the temperature rises above T
MIN
.
For maximum system acoustic benefit, PWM
MIN
should be as
low as possible. Starting the fans at higher speeds than necessary
will merely make the system louder than needed. Depending on
the fan used, the PWM
MIN
setting should be in the range 20%
to 33% duty cycle. This value can be found through
fan validation.
TEMPERATURE
T
MIN
100%
PWM
MIN
0%
Figure 30. PWM
MIN
Determines Minimum PWM Duty Cycle
It is important to note that more than one PWM output can be
controlled from a single temperature measurement channel. For
example, Remote 1 temperature can control PWM1 and PWM2
outputs. If two different fans are used on PWM1 and PWM2,
then the fan characteristics can be set up differently. So Fan 1
driven by PWM1 can have a different PWM
MIN
value than
that of Fan 2 connected to PWM2. Figure 31 illustrates this as
PWM1
MIN
(front fan) is turned on at a minimum duty cycle of
20%, whereas PWM2
MIN
(rear fan) turns on at a minimum of
40% duty cycle. Note however, that both fans turn on at the
exact same temperature, defined by T
MIN
.
TEMPERATURE
T
MIN
100%
PWM1
MIN
0%
P
W
M
1
P
W
M
2
PWM2
MIN
Figure 31. Operating Two Different Fans from a
Single-Temperature Channel
Programming the PWM
MIN
Registers
The PWM
MIN
registers are 8-bit registers that allow the minimum
PWM duty cycle for each output to be configured anywhere
from 0% to 100%. This allows minimum PWM duty cycle to be
set in steps of 0.39%.
The value to be programmed into the PWM
MIN
register is
given by
Value decimal
PWM
MIN
(
)
=
0 39
.
Example 1: For a minimum PWM Duty Cycle of 50%,
Value (decimal) = 50/0.39 = 128 decimal
Value = 128 decimal or 80 hex
Example 2: For a minimum PWM duty cycle of 33%,
Value (decimal) = 33/0.39 = 85 decimal
Value = 85 decimal or 54 hex
PWM
MIN
Registers
Reg. 0x64 PWM1 Minimum Duty Cycle = 0x80 (50% default)
Reg. 0x65 PWM2 Minimum Duty Cycle = 0x80 (50% default)
Reg. 0x66 PWM3 Minimum Duty Cycle = 0x80 (50% default)
Fan Speed and PWM Duty Cycle
Note that PWM duty cycle does not directly correlate to fan
speed in rpm. Running a fan at 33% PWM duty cycle does not
equate to running the fan at 33% speed. Driving a fan at 33%
PWM duty cycle actually runs the fan at closer to 50% of its full
speed. This is because fan speed in %rpm relates to the square
root of PWM duty cycle. Given a PWM square wave as the
drive signal, fan speed in RPM equates to
% fan speed
PWM duty cycle
=
?0
Rev. 3 | Page 31 of 56 | www.onsemi.com
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