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參數(shù)資料
| 型號： | ADM1031ARQ |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | MO-137AB, QSOP-16 |
| 文件頁數(shù)： | 9/35頁 |
| 文件大?。?/td> | 368K |
| 代理商： | ADM1031ARQ |
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ADM1031
Rev. 3 | Page 17 of 35 | www.onsemi.com
FAN CONTROL MODES OF OPERATION
The ADM1031 has four different modes of operation. These
modes determine the behavior of the system.
1.
Automatic Fan Speed Control Mode.
2.
Filtered Automatic Fan Speed Control Mode.
3.
PWM Duty Cycle Select Mode (directly sets fan speed
under software control).
4.
RPM Feedback Mode.
AUTOMATIC FAN SPEED CONTROL
The ADM1031 has a local temperature channel and two remote
temperature channels, which can be connected to an on-chip
diode-connected transistor on a CPU. These three temperature
channels can be used as the basis for an automatic fan speed
control loop to drive fans using pulse width modulation
(PWM).
How Does the Control Loop Work?
The automatic fan speed control loop is shown in Figure 22.
MAX
FAN
SPEED
MIN
TEMPERATURE
TMIN
TMAX = TMIN + TRANGE
SPIN-UP FOR SECONDS
02402-
022
Figure 22. Automatic Fan Speed Control Loop
TMIN is the temperature at which the fan should switch on and run
at minimum speed. The fan only turns on once the temperature
being measured rises above the TMIN value programmed. The
fan spins up for a predetermined time (default = 2 seconds). See
the Fan Spin-Up section for more details.
TRANGE is the temperature range over which the ADM1031
automatically adjusts the fan speed. As the temperature
increases beyond TMIN, the PWM_OUT duty cycle increases
accordingly. The TRANGE parameter actually defines the fan
speed vs. temperature slope of the control loop.
TMAX is the temperature at which the fan is at its maximum
speed. At this temperature, the PWM duty cycle driving the fan
is 100%. TMAX is given by TMIN + TRANGE. Since this parameter is
the sum of the TMIN and TRANGE parameters, it does not need to
be programmed into a register on-chip.
A hysteresis value of 5°C is included in the control loop
to prevent the fan continuously switching on and off if the
temperature is close to TMIN. The fan continues to run until
the temperature drops 5°C below TMIN.
Figure 23 shows the different control slopes determined by the
TRANGE value chosen, and programmed into the ADM1031. TMIN
is set to 0°C to start all slopes from the same point. The figure
shows how changing the TRANGE value affects the PWM duty
cycle vs. temperature slope.
TEMPERATURE (°C)
PWM
DUT
Y
CYCL
E
(
%
)
0
100
93
87
80
73
66
60
53
47
40
33
TMIN
510
20
40
60
80
TMAX = TMIN + TRANGE
T RA
NG
E
= 8
0°C
T R
AN
G
E
=
40
°C
T R
A
N
G
E
=
20
°C
T
R
A
N
G
E
=
10
°C
T
R
A
N
G
E
=
5°
C
02402-
023
Figure 23. PWM Duty Cycle vs. Temperature Slope (TRANGE)
Figure 24 shows how, for a given TRANGE, changing the TMIN
value affects the loop. Increasing the TMIN value increases the
TMAX (temperature at which the fan runs full speed) value, since
TMAX = TMIN + TRANGE. Note, however, that the PWM duty cycle
vs. temperature slope remains exactly the same. Changing the
TMIN value merely shifts the control slope. The TMIN can be
changed in increments of 4°C.
TEMPERATURE (°C)
PWM
DUT
Y
CYCL
E
(
%
)
0
100
93
87
80
73
66
60
53
47
40
33
TMIN
20
40
60
80
TMAX = TMIN + TRANGE
T R
AN
G
E
=
40
°C
T R
AN
G
E
=
40
°C
T R
AN
G
E
=
40
°C
02402-
024
Figure 24. Effect of Increasing TMIN Value on Control Loop
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參數(shù)描述 |
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| ADM1031ARQ-ND | 制造商:ON Semiconductor 功能描述: |
| ADM1031ARQ-REEL | 功能描述:IC SENSOR 2-TEMP/FAN CTRL 16QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風(fēng)扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
| ADM1031ARQ-REEL7 | 功能描述:IC SENSOR 2-TEMP/FAN CTRL 16QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風(fēng)扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
| ADM1031ARQZ | 功能描述:馬達(dá)/運(yùn)動/點火控制器和驅(qū)動器 2 CH TDM PWM FAN CTRL IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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