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| 型号： | ADM1029ARQZ-R7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 21/50页 |
| 文件大小： | 402K |
| 描述： | IC SENSOR 2TEMP/FAN CTRL 24QSOP |
| 产品变化通告： | QSOP 24ld Pkg (MSL) Change 17/Jun/2010 |
| 标准包装： | 1,000 |
| 功能： | 风扇控制，温度监控器 |
| 传感器类型： | 内部和外部 |
| 感应温度： | 0°C ~ 100°C，外部传感器 |
| 精确度： | ±1°C 本地，±3°C 远程 |
| 拓扑： | ADC，风扇控制，寄存器库 |
| 输出类型： | 开路漏极 |
| 输出警报： | 是 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | 0°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 带卷 (TR) |
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ADM1029
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21
T
MIN
was defined as being the temperature at which a fan
switched on and ran at minimum speed. This minimum
speed should be set to 33%. If the minimum PWM duty cycle
is programmed to 33%, the fan control loops will operate as
previously described.
It should be noted, however, that changing the minimum
PWM duty cycle affects the control loop behavior.
33
40
47
53
60
66
73
80
87
93
100
Figure 34. Effect of Changing Minimum Duty Cycle
on Control Loop with T
MIN
and T
RANGE
Values
TEMPERATURE (癈)
T
MIN
0
16
28
60
1
2
3
40
T
RANGE
= 40癈
Table 12. PWM DUTY CYCLE SELECT MODE
Decimal Value
PWM Duty Cycle
00
0%
01
7%
02
14%
03
20%
04
27%
05
33% Recommended
06
40%
07
47%
08
53%
09
60%
10 (0x0A)
67%
11 (0x0B)
73%
12 (0x0C)
80%
13 (0x0D)
87%
14 (0x0E)
93%
15 (0x0F)
100% (Default)
* Bits <3:0> set the Minimum PWM duty cycle for Automatic Mode.
Bits <7:4> set the Alarm Speed PWM duty cycle.
Slope 1 of Figure 34 shows T
MIN
set to 0癈 and the
T
RANGE
chosen is 40癈. In this case, the fans PWM duty
cycle will vary over the range 33% to 100%. The fan will run
full speed at 40癈. 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%. The fan
will actually reach full speed at a much lower temperature,
28癈. 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癈. So the effect of increasing the
minimum 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 registers
holding the minimum PWM duty cycle at T
MIN
, are the
Minimum/Alarm Speed Registers (addresses 60h, 61h).
Table 12 shows the relationship between the decimal values
written to the Minimum/Alarm Speed Registers and PWM
duty cycle obtained.
The temperature at which each fan will run full speed
(100% duty cycle) is given by:
(eq. 6)
T
MAX
+ T
MIN
) ((Max DC * Min DC) T
RAN E
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 TMIN, programmed into
Fan Speed Config Register
(default = 33% = 5 decimal)
T
RANGE
= PWM Duty Cycle versus Temperature Slope
Example 1
T
MIN
= 0?/SPAN>C, T
RANGE
= 40癈
Min DC = 53% = 8 decimal (Table 12)
Calculate T
MAX
(eq. 7)
T
MAX
+ T
MIN
) ((Max DC * Min DC) T
RANGE
10)
T
MAX
+ 0 ) ((100% DC * 53% DC) 4010)
T
+ 0 ) ((15 * 8) 4) + 28
T
MAX
=285C. (As seen on Slope 2 of Figure 34)
Example 2
T
MIN
= 0?/SPAN>C, T
RANGE
= 40癈
Min DC = 73% = 11 decimal (Table 12)
Calculate T
MAX
(eq. 8)
T
MAX
+ T
MIN
) ((Max DC * Min DC) T
RANGE
10)
T
MAX
+ 0 ) ((100% DC * 73% DC) 4010)
T
+ 0 ) ((15 * 11) 4) + 16
T
MAX
=165C. (As seen on Slope 3 of Figure 34)
Example 3
T
MIN
= 0?/SPAN>C, T
RANGE
= 40癈
Min DC = 33% = 5 decimal (Table 12)
Calculate T
MAX
(eq. 9)
T
MAX
+ T
MIN
) ((Max DC * Min DC) T
RANGE
10)
T
MAX
+ 0 ) ((100% DC * 33% DC) 4010)
T
+ 0 ) ((15 * 5) 4) + 40
T
MAX
=405C. (As seen on Slope 1 of Figure 34)
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