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參數(shù)資料
| 型號(hào)： | 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)： | 9/36頁 |
| 文件大?。?/td> | 596K |
| 代理商： | ADM1031ARQZ |
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ADM1031
Rev. B | Page 17 of 36
Programming the Automatic Fan Speed Control Loop
1.
Program a value for TMIN.
2.
Program a value for the slope TRANGE.
3.
TMAX = TMIN + TRANGE.
4.
Program a value for fan spin-up time.
5.
Program the desired automatic fan speed control mode
behavior, that is, which temperature channel controls the fan.
6.
Select automatic fan speed control mode by setting Bit 7 of
Configuration Register 1.
Other Control Loop Parameters
It should be noted that changing the minimum PWM duty
cycle affects the control loop behavior.
chosen is 40°C. In this case, the fan’s PWM duty cycle varies
over the range 33% to 100%. The fan runs full-speed at 40°C. If
the minimum PWM duty cycle at which the fan runs at TMIN is
changed, its effect can be seen on Slope 2 and Slope 3. Take
Case 2, where the minimum PWM duty cycle is reprogrammed
from 33% (default) to 53%.
TEMPERATURE (
°C)
0
100
93
87
80
66
60
47
40
33
TMIN
16
28
40
60
P
WM
DUTY
CY
CLE
(%
)
73
53
3
1
2
T R
A
N
G
E
=
40
°C
02402-027
Figure 27. Effect of Changing Minimum Duty Cycle on Control Loop
with Fixed TMIN and TRANGE Values
The fan actually reaches full speed at a much lower temperature,
28°C. Case 3 shows that when the minimum PWM duty cycle is
increased to 73%, the temperature at which the fan runs full
speed is 16°C. Therefore, the effect of increasing the minimum
PWM duty cycle, with a fixed TMIN and fixed TRANGE, is that the
fan actually reaches full speed (TMAX) at a lower temperature
than TMIN + TRANGE.
How can TMAX be calculated?
In automatic fan speed control mode, the register that holds
the minimum PWM duty cycle at TMIN, is the fan speed
configuration register (Register 0×22). Table 11 shows the
relationship between the decimal values written to the fan
speed configuration register and PWM duty cycle obtained.
Table 11. 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 full-speed
(100% duty cycle) is given by:
TMAX = TMIN + ((Max DC – Min DC) × TRANGE/10)
where:
TMAX = Temperature at which fan runs full-speed.
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 11)
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 27)
Example 2
TMIN = 0°C, TRANGE = 40°C
Min DC = 73% = 11 decimal (Table 11)
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 27)
Example 3
TMIN = 0°C, TRANGE = 40°C
Min DC = 33% = 5 decimal (Table 11)
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