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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)： | 15/35頁 |
| 文件大?。?/td> | 368K |
| 代理商： | ADM1031ARQ |
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ADM1031
Rev. 3 | Page 22 of 35 | www.onsemi.com
What does an increase of 1, 2, 4, or 8 time slots actually
mean in terms of PWM duty cycle?
A ramp rate of 1 corresponds to one time slot, which is 1/240
of the PWM period. In filtered auto fan speed control mode,
incrementing or decrementing by 1 changes the PWM output
duty cycle by 0.416%.
Table 12. Effect of Ramp Rates on PWM_OUT
Ramp Rate
PWM Duty Cycle Change
1
0.416%
2
0.833%
4
1.66%
8
3.33%
So programming a ramp rate of 1, 2, 4, or 8 simply increases or
decreases the PWM duty cycle by the amounts shown in Table 12,
depending on whether the temperature is increasing or decreasing.
Figure 30 shows remote temperature plotted against PWM duty
cycle for filtered mode. The ADC sample rate is the highest sample
rate; 11.25 kHz. The ramp rate is set to 8, which would correspond
to the fastest ramp rate. With these settings, it took approximately
12 seconds to go from 0% duty cycle to 100% duty cycle (full-
speed). The TMIN value = 32°C and the TRANGE = 80°C. Even though
the temperature increased very rapidly, the fan gradually ramps up
to full speed.
140
PWM DUTY CYCLE
0
012
TIME (s)
R
TE
MP
(°
C)
120
100
80
60
40
20
120
0
P
W
M
DUT
Y
CY
CL
E
(%
)
100
80
60
40
20
RTEMP
02402-
030
Figure 30. Filtered Mode with Ramp Rate = 8
Figure 31 shows how changing the ramp rate from 8 to 4 affects the
control loop. The overall response of the fan is slower. Because the
ramp rate is reduced, it takes longer for the fan to achieve full
running speed. In this case, it took approximately 22 seconds for
the fan to reach full speed.
120
PWM DUTY CYCLE
0
022
TIME (s)
R
TE
MP
(°
C)
110
80
60
40
20
120
140
0
P
W
M
DUT
Y
CY
CL
E
(
%
)
100
80
60
40
20
RTEMP
02402-
031
Figure 31. Filtered Mode with Ramp Rate = 4
Figure 32 shows the PWM output response for a ramp rate of 2.
In this instance the fan took about 54 seconds to reach full
running speed.
140
PWM DUTY CYCLE
0
054
TIME (s)
R
TE
MP
(°
C)
120
100
80
60
40
20
120
0
P
W
M
DUT
Y
CY
CL
E
(
%
)
100
80
60
40
20
RTEMP
02402-
032
Figure 32. Filtered Mode with Ramp Rate = 2
Finally, Figure 33 shows how the control loop reacts to
temperature with the slowest ramp rate. The ramp rate is set to
1, while all other control parameters remain the same. With the
slowest ramp rate selected, it took 112 seconds for the fan to
reach full speed.
120
PWM DUTY CYCLE
0
112
TIME (s)
P
W
M
DUT
Y
CY
CL
E
(%
)
110
80
60
40
20
140
0
R
TE
MP
(°
C)
120
100
80
60
40
20
RTEMP
02402-
033
Figure 33. Filtered Mode with Ramp Rate = 1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(diǎn)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 |
| ADM1031ARQZ-R7 | 功能描述:IC SENSOR 2TEMP/FAN CTRL 16QSOP RoHS:是 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 |
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