参数资料
| 型号： | ADT7468ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 48/81页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADT7468 |
| 标准包装： | 1 |
| 其它名称： | EVAL-ADT7468EB EVAL-ADT7468EB-ND |
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ADT7468
Example: Calculate T MAX , given that T MIN = 30°C, T RANGE = 40°C,
100%
50%
33%
25%
10%
0%
30°C
40°C
45°C
and PWM MIN = 33% duty cycle = 85 (decimal).
T MAX = T MIN + ( Max DC ? Min DC ) × T RANGE /170
T MAX = 30°C + (100% ? 33%) × 40°C/170
T MAX = 30°C + (255 ? 85) × 40°C/170
T MAX = 70°C ( effective T RANGE = 40°C)
Example: Calculate T MAX , given that T MIN = 30°C, T RANGE = 40°C,
and PWM MIN = 50% duty cycle = 128 (decimal).
T MAX = T MIN + ( Max DC ? Min DC ) × T RANGE /170
T MIN
54°C
T MAX = 30°C + (100% ? 50%) × 40°C/170
T MAX = 30°C + (255 ? 128) × 40°C/170
Figure 64. Increasing PWM MIN Changes Effective T RANGE
For a given T RANGE value, the temperature at which the fan runs
at full speed for different PWM MIN values can be easily
calculated:
T MAX = T MIN + ( Max DC ? Min DC ) × T RANGE /170
where:
T MAX = 60°C ( effective T RANGE = 30°C)
Selecting a T RANGE Slope
The T RANGE value can be selected for each temperature channel:
Remote 1, local, and Remote 2 temperature. Bits <7:4> (T RANGE )
of Registers 0x5F to 0x61 define the T RANGE value for each
temperature channel.
Table 15. Selecting a T RANGE Value
T MAX is the temperature at which the fan runs full speed.
T MIN is the temperature at which the fan turns on.
Max DC is the maximum duty cycle (100%) = 255 decimal.
Min DC is equal to PWM MIN .
T RANGE is the duty PWM duty cycle vs. temperature slope.
Example: Calculate T , given that T MIN = 30°C, T RANGE = 40°C,
and PWM MIN = 10% duty cycle = 26 (decimal).
T MAX = T MIN + ( Max DC ? Min DC ) × T RANGE /170
T MAX = 30°C + (100% ? 10%) × 40°C/170
T MAX = 30°C + (255 ? 26) × 40°C/170
T MAX = 84°C ( effective T RANGE = 54°C)
Example: Calculate T MAX , given that T MIN = 30°C, T RANGE = 40°C,
and PWM MIN = 25% duty cycle = 64 (decimal).
T MAX = T MIN + ( Max DC ? Min DC ) × T RANGE /170
T MAX = 30°C + (100% ? 25%) × 40°C/170
Bits <7:4> 1
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
T RANGE (°C)
2
2.5
3.33
4
5
6.67
8
10
13.33
16
20
26.67
32 (default)
40
53.33
80
T MAX = 30°C + (255 ? 64) × 40°C/170
T MAX = 75°C ( effective T RANGE = 45°C)
Summary of T RANGE Function
When using the automatic fan control function, the
temperature at which the fan reaches full speed can be
calculated by
T MAX = T MIN + T RANGE
(1)
1
Register 0x5F configures Remote 1 T RANGE . Register 0x60 configures Local
T RANGE . Register 0x61 configures Remote 2 T RANGE .
Equation 1 holds true only when PWM MIN is equal to 33%
PWM duty cycle.
Rev. 3 | Page 48 of 81 | www.onsemi.com
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