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參數(shù)資料
| 型號： | ADM1031ARQZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | LEAD FREE, MO-137AB, QSOP-16 |
| 文件頁數(shù)： | 13/36頁 |
| 文件大?。?/td> | 596K |
| 代理商： | ADM1031ARQZ |
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ADM1031
Rev. B | Page 20 of 36
12
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
TIME (s)
R
TEM
P
(
°C)
120
100
80
60
40
20
120
0
PWM
DUTY
CYCLE
(%)
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
22
TIME (s)
R
TEM
P
(
°C)
110
80
60
40
20
120
140
0
P
W
M
DUTY
CY
CLE
(%)
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
54
TIME (s)
R
TEM
P
(
°C)
120
100
80
60
40
20
120
0
P
W
M
DUTY
CY
CLE
(%)
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
DUTY
CY
CLE
(%)
110
80
60
40
20
140
0
R
TEM
P
(
°C)
120
100
80
60
40
20
RTEMP
02402-033
Figure 33. Filtered Mode with Ramp Rate = 1
As can be seen from Figure 30 through Figure 33, the rate at
which the fan reacts to temperature change is dependent on the
ramp rate selected in the fan filter register. The higher the ramp
rate, the faster the fan reaches the newly calculated fan speed.
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| ADM1031ARQZ-REEL | 功能描述:板上安裝溫度傳感器 2 CH TDM PWM FAN CTRL IC RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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