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| 型號： | ADT7473ARQZ-1REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | ROHS COMPLIANT, MO-137AB, QSOP-16 |
| 文件頁數(shù)： | 43/72頁 |
| 文件大?。?/td> | 1494K |
| 代理商： | ADT7473ARQZ-1REEL |
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ADT7473/ADT7473-1
Rev. C | Page 48 of 72
Figure 71 shows the steps taken during the long cycle.
WAIT 2n
MONITORING
CYCLES
IS T1(n) < LOW TEMP LIMIT
AND
TMIN < HIGH TEMP LIMIT
AND
TMIN < OP1
AND
T1(n) > TMIN
IS T1(n) > OP1
YES
INCREASE
TMIN BY 1°C
YES
NO
DECREASE TMIN
BY 1°C
CURRENT
TEMPERATURE
MEASUREMENT
T1(n)
OPERATING
POINT
TEMPERATURE
OP1
DO NOT
CHANGE
04
68
6-
06
8
Figure 71. Long Cycle Steps
The following examples illustrate some of the circumstances
that might cause TMIN to increase, decrease, or stay the same.
Example 1: Normal Operation—No TMIN Adjustment
If measured temperature never exceeds the programmed
operating point minus the hysteresis temperature, then
TMIN is not adjusted; that is, it remains at its current setting.
If measured temperature never drops below the low
temperature limit, then TMIN is not adjusted.
TMIN
THERM LIMIT
OPERATING
POINT
HIGH TEMP
LIMIT
LOW TEMP
LIMIT
ACTUAL
TEMP
HYSTERESIS
04
68
6-
0
69
Figure 72. Temperature Between Operating Point
and Low Temperature Limit
Because neither the operating point minus the hysteresis
temperature nor the low temperature limit has been exceeded,
the TMIN value is not adjusted, and the fan runs at a speed
determined by the fixed TMIN and TRANGE values defined in the
automatic fan speed control mode.
Example 2: Operating Point Exceeded—TMIN Reduced
When the measured temperature is below the operating point
temperature minus the hysteresis, TMIN remains the same.
Once the temperature exceeds the operating temperature minus
the hysteresis (OP Hyst), TMIN starts to decrease. This occurs
during the short cycle (see Figure 70). The rate at which TMIN
decreases depends on the programmed value of n. It also
depends on how much the temperature has increased between
this monitoring cycle and the last monitoring cycle; that is, if
the temperature has increased by 1°C, then TMIN is reduced by
2°C. Decreasing TMIN has the effect of increasing the fan speed,
thus providing more cooling to the system.
If the temperature slowly increases only in the range
(OP Hyst), that is, ≤0.25°C per short monitoring cycle, then
TMIN does not decrease. This allows small changes in
temperature in the desired operating zone without changing
TMIN. The long cycle makes no change to TMIN in the tempera-
ture range (OP Hyst) because the temperature has not
exceeded the operating temperature.
Once the temperature exceeds the operating temperature, the
long cycle causes TMIN to be reduced by 1°C every long cycle
while the temperature remains above the operating tempera-
ture. This takes place in addition to the decrease in TMIN that
occurs due to the short cycle. In Figure 73, because the
temperature is increasing at a rate ≤0.25°C per short cycle, no
reduction in TMIN takes place during the short cycle.
Once the temperature falls below the operating temperature,
TMIN stays the same. Even when the temperature starts to
increase slowly, TMIN stays the same because the temperature
increases at a rate ≤0.25°C per cycle.
Example 3: Increase TMIN Cycle
When the temperature drops below the low temperature limit,
TMIN can increase in the long cycle. Increasing TMIN has the
effect of running the fan slower and, therefore, quieter. The long
cycle diagram in Figure 71 shows the conditions required for
TMIN to increase. A quick summary of those conditions and the
reasons they need to be true follows.
TMIN can increase if
The measured temperature falls 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 would not switch on until the
temperature rose above the operating point.
The temperature is above TMIN. The dynamic TMIN control
is turned off below TMIN.
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| ADT7473ARQZ-1REEL7 | 功能描述:IC THERM MON FAN CTRLR 16-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 標準包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
| ADT7473ARQZ-1RL | 功能描述:板上安裝溫度傳感器 FAN CNTRLR/INT MON RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| ADT7473ARQZ-REEL | 功能描述:板上安裝溫度傳感器 FAN CNTRLR/INT MON RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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