参数资料
| 型号： | ADT7462ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 45/82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 |
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ADT7462
When the temperature falls below the operating
temperature, T MIN stays the same. Even when the
temperature starts to increase slowly, T MIN stays the same,
because the temperature increases at a rate of ? 0.25 ? C per
cycle.
THERM LIMIT
HIGH TEMP LIMIT
OPERATING POINT
HYSTERESIS
Figure 72 shows how T MIN increases when the current
temperature is above T MIN and below the low temperature
limit, and T MIN is below the high temperature limit and
below the operating point. When the temperature rises above
the low temperature limit, T MIN stays the same.
THERM LIMIT
HIGH TEMP LIMIT
OPERATING POINT
HYSTERESIS
T MIN
ACTUAL
TEMP
NO CHANGE IN T MIN HERE
DUE TO ANY CYCLE BECAUSE
T1(n) – T1 (n – 1) ≤ 0.25 5 C
AND T1(n) < OP = > T MIN
STAYS THE SAME
LOW TEMP
LIMIT
ACTUAL
TEMP
LOW TEMP LIMIT
T MIN
Figure 72. Increasing T MIN for Quieter Operation
DECREASE HERE DUE TO
SHORT CYCLE ONLY
T1(n) – T1 (n – 1) ≤ 0.25 5 C
OR 0.75 5 C = > T MIN
DECREASES BY 1 5 C
EVERY SHORT CYCLE
DECREASE HERE DUE TO
LONG CYCLE ONLY
T1(n) – T1 (n – 1) ≤ 0.25 5 C
AND T1(n) > OP = > T MIN
DECREASES BY 1 5 C
EVERY LONG CYCLE
Example 4: Preventing T MIN from Reaching Full Scale
Because T MIN is dynamically adjusted, it is undesirable
for T MIN to reach full scale (191 ? C), because the fan would
never switch on. As a result, T MIN is allowed to vary only
within a specified range.
T MIN
Figure 71. Effect of Exceeding Operating Point Minus
Hysteresis Temperature
Example 3: Temperature Below Low Limit, T MIN Increased
When the temperature drops below the low temperature
limit, T MIN may increase, as shown in Figure 72. Increasing
T MIN has the effect of running the fan more slowly and,
therefore, more quietly. The long cycle diagram in Figure 69
shows the conditions that need to be true for T MIN to
increase. The following is a quick summary of those
conditions and the reasons they need to be true:
T MIN may increase, if
? The measured temperature has fallen below the low
temperature limit. This means the user must choose the
low limit carefully. It should not be so low that the
temperature never falls below it, because T MIN would
never increase and the fans would run faster than
necessary.
? T MIN is below the high temperature limit. T MIN is
never allowed to increase above the high temperature
limit. As a result, the high limit should be sensibly
chosen, because it determines how high T MIN can go.
? T MIN is below the operating point temperature. T MIN
should never be allowed to increase above the operating
point temperature, because the fans do not switch on
until the temperature rises above the operating point.
? The temperature is above T MIN . The dynamic T MIN
control is turned off below T MIN .
? The lowest possible value for T MIN is ? 64 ? C.
? T MIN cannot exceed the high temperature limit.
? If the temperature is below T MIN , the fan is switched
off or is running at minimum speed, and dynamic T MIN
control is disabled.
THERM LIMIT
OPERATING POINT
HYSTERESIS
ACTUAL
LOW TEMP TEMP
LIMIT
HIGH TEMP LIMIT
T MIN PREVENTED
FROM INCREASING
Figure 73. T MIN Adjustments Limited by High
Temperature Limit
Enabling Dynamic T MIN Control Mode
Bits [1:0] of Dynamic T MIN Control Register 1 (0x0B)
enable/disable dynamic T MIN control on the temperature
channels (see Table 43).
Dynamic T MIN Control Register 1 (0x0B)
Bit 1 (Remote 2 En) = 1 enables dynamic T MIN control on
the Remote 2 temperature channel. The chosen T MIN value
is dynamically adjusted based on the current temperature,
operating point, and high and low limits for this zone.
Bit 1 (Remote 2 En) = 0 disables dynamic T MIN control.
The T MIN value chosen is not adjusted and the channel
behaves as described in the Automatic Fan Control
Overview section.
http://onsemi.com
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