参数资料
型号: ADT7462ZEVB
厂商: ON Semiconductor
文件页数: 38/82页
文件大小: 0K
描述: BOARD EVALUATION FOR ADT7462
产品变化通告: MFG CHG Notification ADI to ON Semi
标准包装: 1
类型: 温度传感器
适用于相关产品: ADT7462
所含物品: 评估板
其它名称: EVAL-ADT7462EBZ
EVAL-ADT7462EBZ-ND
ADT7462
The T RANGE or fan control slope is determined by the
following procedure:
1. Determine the maximum operating temperature for
that channel (for example, 70 ? C).
2. Determine experimentally the fan speed (PWM
duty cycle value) that does not exceed the
temperature at the worst-case operating points.
(For example, 70 ? C is reached when the fans are
running at 50% PWM duty cycle.)
3. Determine the slope of the required control loop to
meet these requirements.
4. Using the ADT7462 evaluation software, this
functionality can be graphically programmed and
visualized.
100%
50%
33%
0%
30 ? C
40 ? C
T MIN
Figure 58. Adjusting PWM MIN Affects T RANGE
T RANGE is implemented as a slope, which means that as
PWM MIN is changed, T RANGE changes, but the actual slope
remains the same. The higher the PWM MIN value, the
smaller the effective T RANGE ; that is, the fan reaches full
speed (100%) at a lower temperature.
100%
where:
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 PWM duty cycle vs. temperature slope.
Example 1
Calculate T MAX , 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 2
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
T MAX = 30 ? C + (255 ? 64) ? 40 ? C/170
T MAX = 75 ? C (effective T RANGE = 45 ? C)
Example 3
Calculate T MAX , given that T MIN = 30 ? C, T RANGE = 40 ? 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 4
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 MAX = 30 ? C + (100% ? 50%) ? 40 ? C/170
T MAX = 30 ? C + (255 ? 128) ? 40 ? C/170
T MAX = 60 ? C (effective T RANGE = 30 ? C)
50%
33%
25%
10%
0%
T MIN
30 ? C
40 ? C
45 ? C
54 ? C
Selecting a T RANGE Slope
The T RANGE value can be selected for each temperature
channel: local, Remote 1, Remote 2, and Remote 3.
Bits [7:4] (RANGE) of Register 0x60 to Register 0x63
define the T RANGE value for each temperature channel (see
Table 85 and Table 86).
Summary of T RANGE Function
When using the automatic fan control function, the
temperature at which the fan reaches full speed can be
Figure 59. Increasing PWM MIN Changes Effective
T RANGE
calculated by:
T MAX + T MIN ) T RANGE
(eq. 6)
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 by:
T MAX = T MIN + (Max DC ? Min DC) ? T RANGE /170
Equation 6 holds true only when PWM MIN is equal to
33% PWM duty cycle.
Increasing or decreasing PWM MIN changes the effective
T RANGE , although the fan control still follows the same
PWM duty cycle to temperature slope. The effective
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