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參數資料
| 型號： | ADM1030ARQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Intelligent Temperature Monitor and PWM Fan Controller |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 1Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | MO-137AB, QSOP-16 |
| 文件頁數： | 14/28頁 |
| 文件大小： | 278K |
| 代理商： | ADM1030ARQ |
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REV. 0
ADM1030
–14–
It should be noted however, that changing the minimum PWM
duty cycle affects the control loop behavior.
Slope 1 of Figure 10 shows T
MIN
set to 0
°
C and the T
RANGE
chosen is 40
°
C. In this case, the fan’s PWM duty cycle will vary
over the range 33% to 100%. The fan will run full-speed at
40
°
C. If the minimum PWM duty cycle at which the fan runs at
T
MIN
is changed, its effect can be seen on Slopes 2 and 3. Take
Case 2, where the minimum PWM duty cycle is reprogrammed
from 33% (default) to 53%.
TEMPERATURE
–
C
100
93
87
80
73
66
60
47
40
33
T
MIN
16
28
40
60
0
P
–
53
T
RANGE
0C
Figure 10. Effect of Changing Minimum Duty Cycle on
Control Loop with Fixed T
MIN
and T
RANGE
Values
The fan will actually reach full-speed at a much lower tempera-
ture, 28
°
C. Case 3 shows that when the minimum PWM duty
cycle was increased to 73%, the temperature at which the fan
ran full-speed was 16
°
C. So the effect of increasing the mini-
mum PWM duty cycle, with a fixed T
MIN
and fixed T
RANGE
, is
that the fan will actually reach full-speed (T
MAX
) at a lower
temperature than T
MIN
+ T
RANGE
. How can T
MAX
be calculated
In Automatic Fan Speed Control Mode, the register that
holds the minimum PWM duty cycle at T
MIN
, is the Fan Speed
Config Register (Register 0x22). Table VII shows the relation-
ship between the decimal values written to the Fan Speed Config
Register and PWM duty cycle obtained.
Table VII. Programming PWM Duty Cycle
Decimal Value
PWM Duty Cycle
00
01
02
03
04
05
06
07
08
09
10 (0x0A)
11 (0x0B)
12 (0x0C)
13 (0x0D)
14 (0x0E)
15 (0x0F)
0%
7%
14%
20%
27%
33% (Default)
40%
47%
53%
60%
67%
73%
80%
87%
93%
100%
The temperature at which the fan will run full-speed (100%
duty cycle) is given by:
T
MAX
=
T
MIN
+ ((
Max DC
–
Min DC
)
×
T
RANGE
/10)
where,
T
MAX
= Temperature at which fan runs full-speed.
T
MIN
= Temperature at which fan will turn on.
Max DC
= Maximum Duty Cycle (100%) = 15 decimal.
Min DC
= Duty Cycle at T
MIN
, programmed into Fan Speed
Config Register (default = 33% = 5 decimal).
T
RANGE
= PWM Duty Cycle versus Temperature Slope.
Example 1
T
MIN
= 0
°
C, T
RANGE
= 40
°
C
Min DC = 53% = 8 decimal (Table VII)
Calculate T
MAX
.
T
MAX
= T
MIN
+ ((Max DC – Min DC)
×
T
RANGE
/10)
T
MAX
= 0 + ((100% DC – 53% DC)
×
40/10)
T
MAX
= 0 + ((15 – 8)
×
4) = 28
T
MAX
=
28 C
(As seen on Slope 2 of Figure 10)
Example 2
T
MIN
= 0
°
C, T
RANGE
= 40
°
C
Min DC
= 73% = 11 Decimal (Table VII)
Calculate T
MAX
.
T
MAX
= T
MIN
+ ((Max DC – Min DC)
×
T
RANGE
/10)
T
MAX
= 0 + ((100% DC – 73% DC)
×
40/10)
T
MAX
= 0 + ((15 – 11)
×
4) = 16
T
MAX
=
16 C
(As seen on Slope 3 of Figure 10)
Example 3
T
MIN
= 0
°
C, T
RANGE
= 40
°
C
Min DC
= 33% = 5 Decimal (Table VII)
Calculate T
MAX
.
T
MAX
= T
MIN
+ ((Max DC – Min DC)
×
T
RANGE
/10)
T
MAX
= 0 + ((100% DC – 33% DC)
×
40/10)
T
MAX
= 0 + ((15 – 5)
×
4) = 40
T
MAX
=
40 C
(As seen on Slope 1 of Figure 10)
In this case, since the Minimum Duty Cycle is the default 33%,
the equation for T
MAX
reduces to:
T
MAX
= T
MIN
+ ((Max DC – Min DC)
×
T
RANGE
/10)
T
MAX
= T
MIN
+ ((15 – 5)
×
T
RANGE
/10)
T
MAX
= T
MIN
+ (10
×
T
RANGE
/10)
T
MAX
=
T
MIN
+ T
RANGE
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