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參數(shù)資料
| 型號(hào)： | ADT7462ACPZ-500RL7 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 4Cel, SQUARE, SURFACE MOUNT |
| 封裝： | 5 X 5 MM, LFCSP-32 |
| 文件頁數(shù)： | 44/88頁 |
| 文件大?。?/td> | 836K |
| 代理商： | ADT7462ACPZ-500RL7 |
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ADT7462
Rev. 2 | Page 49 of 88 | www.onsemi.com
TMIN
THERM
LIMIT
OPERATING
POINT
HIGH TEMP
LIMIT
LOW TEMP
LIMIT
HYSTERESIS
DECREASE HERE DUE TO
SHORT CYCLE ONLY
T1(n) – T1 (n – 1) = 0.5°C
OR 0.75°C = > TMIN
DECREASES BY 1°C
EVERY SHORT CYCLE
DECREASE HERE DUE TO
LONG CYCLE ONLY
T1(n) – T1 (n – 1) ≤ 0.25°C
AND T1(n) >OP= >TMIN
DECREASES BY 1°C
EVERY LONG CYCLE
NO CHANGE IN TMIN HERE
DUE TO ANY CYCLE BECAUSE
T1(n) – T1 (n – 1) ≤ 0.25°C
ANDT1(n) <OP =>TMIN
STAYS THE SAME
ACTUAL
TEMP
055
69-
061
Figure 72. Effect of Exceeding Operating Point Minus Hysteresis Temperature
Example 3: Temperature Below Low Limit, TMIN Increased
When the temperature drops below the low temperature limit,
TMIN may increase, as shown in Figure 73. Increasing TMIN has
the effect of running the fan more slowly and, therefore, more
quietly. The long cycle diagram in Figure 70 shows the conditions
that need to be true for TMIN to increase. The following is a quick
summary of those conditions and the reasons they need to be true:
TMIN 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 TMIN would never
increase and the fans would run faster than necessary.
TMIN is below the high temperature limit. TMIN 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 TMIN can go.
TMIN is below the operating point temperature. TMIN 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 TMIN. The dynamic TMIN control
is turned off below TMIN.
Figure 73 shows how TMIN increases when the current tempera-
ture is above TMIN and below the low temperature limit, and
TMIN is below the high temperature limit and below the
operating point. When the temperature rises above the low
temperature limit, TMIN stays the same.
TMIN
OPERATING
POINT
HIGH TEMP
LIMIT
LOW TEMP
LIMIT
ACTUAL
TEMP
HYSTERESIS
THERM
LIMIT
05
569-
062
Figure 73. Increasing TMIN for Quieter Operation
Example 4: Preventing TMIN from Reaching Full Scale
Because TMIN is dynamically adjusted, it is undesirable for TMIN to
reach full scale (191°C), because the fan would never switch on.
As a result, TMIN is allowed to vary only within a specified range.
The lowest possible value for TMIN is 64°C.
TMIN cannot exceed the high temperature limit.
If the temperature is below TMIN, the fan is switched off or
is running at minimum speed, and dynamic TMIN control
is disabled.
TMIN PREVENTED
FROM INCREASING
TMIN
OPERATING
POINT
HIGH TEMP
LIMIT
LOW TEMP
LIMIT
ACTUAL
TEMP
HYSTERESIS
THERM
LIMIT
05569-
063
Figure 74. TMIN Adjustments Limited by High Temperature Limit
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