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參數(shù)資料
| 型號： | ADM1031ARQZ-R7 |
| 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： | LEAD FREE, QSOP-16 |
| 文件頁數(shù)： | 7/30頁 |
| 文件大?。?/td> | 299K |
| 代理商： | ADM1031ARQZ-R7 |
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ADM1031
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15
Table 7. Programming PWM Duty Cycle
Decimal Value
PWM Duty Cycle
00
0%
01
7%
02
14%
03
20%
04
27%
05
33% (Default)
06
40%
07
47%
08
53%
09
60%
10 (0×0A)
67%
11 (0×0B)
73%
12 (0×0C)
80%
13 (0×0D)
87%
14 (0×0E)
93%
15 (0×0F)
100%
The temperature at which the fan runs fullspeed (100%
duty cycle) is given by:
TMAX = TMIN + ((Max DC – Min DC) × TRANGE/10)
where:
TMAX = Temperature at which fan runs fullspeed.
TMIN = Temperature at which fan turns on.
Max DC = Maximum duty cycle (100%) = 15 decimal.
Min DC = Duty cycle at TMIN, programmed in to fan speed
configuration register (default = 33% = 5 decimal).
TRANGE = PWM duty cycle vs. temperature slope.
Example 1
TMIN = 0°C, TRANGE = 40°C
Min DC = 53% = 8 decimal (Table 7)
Calculate TMAX.
TMAX = TMIN + ((Max DC Min DC) × TRANGE/10)
TMAX = 0 + ((100% DC 53% DC) × 40/10)
TMAX = 0 + ((15 8) × 4) = 28
TMAX = 28°C (as seen on Slope 2 of Figure 26)
Example 2
TMIN = 0°C, TRANGE = 40°C
Min DC = 73% = 11 decimal (Table 7)
Calculate TMAX.
TMAX = TMIN + ((Max DC – Min DC) × TRANGE/10)
TMAX = 0 + ((100% DC – 73% DC) × 40/10)
TMAX = 0 + ((15 – 11) × 4) = 16
TMAX = 16°C (as seen on Slope 3 of Figure 26)
Example 3
TMIN = 0°C, TRANGE = 40°C
Min DC = 33% = 5 decimal (Table 7)
Calculate TMAX.
TMAX = TMIN + ((Max DC – Min DC) × TRANGE/10)
TMAX = 0 + ((100% DC – 33% DC) × 40/10)
TMAX = 0 + ((15 – 5) × 4) = 40
TMAX = 40°C (as seen on Slope 1 of Figure 26)
In this case, since the minimum duty cycle is the default
33%, the equation for TMAX reduces to:
TMAX = TMIN + ((Max DC – Min DC) × TRANGE/10)
TMAX = TMIN + ((15 – 5) × TRANGE/10)
TMAX = TMIN + (10 × TRANGE/10)
TMAX = TMIN + TRANGE
Relevant Registers for Automatic Fan Speed Control
Mode
Register 0y00 Configuration Register 1
<7> Logic 1 selects automatic fan speed control, Logic 0
selects software control (Default = 1).
<6:5> 00 = Remote Temp 1 controls Fan 1, Remote Temp 2
controls Fan 2.
01 = Remote Temp 1 controls Fan 1 and Fan 2
10 = Remote Temp 2 controls Fan 1 and Fan 2
11 = Fastest Calculated Speed controls Fan 1 and 2
Register 0y20, 0y21 Fan Characteristics Registers 1, 2
<2:0> Fan X SpinUp Time.
000 = 200 ms
001 = 400 ms
010 = 600 ms
011 = 800 ms
100 = 1 sec
101 = 2 sec (Default)
110 = 4 sec
111 = 8 sec
<5:3> PWM Frequency Driving the Fan.
000 = 11.7 Hz
001 = 15.6 Hz
010 = 23.4 Hz
011 = 31.25 Hz (Default)
100 = 37.5 Hz
101 = 46.9 Hz
110 = 62.5 Hz
111 = 93.5 Hz
<7:6> Speed Range N; defines the lowest fan speed that can
be measured by the device.
00 = 1: Lowest Speed = 2647 RPM
01 = 2: Lowest Speed = 1324 RPM
10 = 4: Lowest Speed = 662 RPM
11 = 8: Lowest Speed = 331 RPM
Register 0y22 Fan Speed Configuration Register
<3:0> Min Speed: This nibble contains the speed at which
the fan runs when the temperature is at TMIN. The default is
0
×05, meaning that the fan runs at 33% duty cycle when the
temperature is at TMIN.
<7:4> Min Speed: Determines the minimum PWM cycle for
Fan 2 in automatic fan speed control mode.
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