參數(shù)資料
型號： 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)： 43/88頁
文件大小： 836K
代理商： ADT7462ACPZ-500RL7
ADT7462
Rev. 2 | Page 48 of 88 | www.onsemi.com
IS T1(n) – T1(n –1)= 0.5–0.75°C
IS T1(n) – T1(n –1)= 1.0–1.75°C
IS T1(n) – T1(n – 1) > 2.0°C
IS T1(n) >
(OP1 – HYS)
YES
IS T1(n) – T1(n – 1)
≤
0.25°C
DO NOTHING
(SYSTEM
COOLING IS OFF
OR CONSTANT)
YES
NO
DO NOTHING
WAIT n
MONITORING
CYCLES
PREVIOUS
TEMPERATURE
MEASUREMENT
T1 (n – 1)
CURRENT
TEMPERATURE
MEASUREMENT
T1(n)
OPERATING
POINT
TEMPERATURE
OP1
DECREASE TMIN BY 1°C
DECREASE TMIN BY 2°C
DECREASE TMIN BY 4°C
055
69-
058
Figure 69. Short Cycle Steps
Figure 70 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
05569
-059
Figure 70. Long Cycle Steps
The following examples illustrate some of the circumstances
that may cause TMIN to increase, decrease, or stay the same.
Example 1: Normal Operation, No TMIN Adjustment
1.
If the measured temperature never exceeds the
programmed operating point minus the hysteresis
temperature, TMIN is not adjusted; that is, it remains
at its current setting.
2.
If the measured temperature never drops below the low
temperature limit, TMIN is not adjusted.
TMIN
THERM LIMIT
OPERATING
POINT
HIGH TEMP
LIMIT
LOW TEMP
LIMIT
ACTUAL
TEMP
HYSTERESIS
05569-
060
Figure 71. Temperature Between the Operating Point
and the 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 as illustrated in
Figure 72. This occurs during the short cycle (see Figure 69).
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 is slowly increasing 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.
When 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 temperature.
This takes place in addition to the decrease in TMIN that would
occur due to the short cycle. In Figure 71, because the
temperature is increasing at a rate ≤0.25°C per short cycle, no
reduction in TMIN takes place during the short cycle.
When 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 of ≤0.25°C per cycle.
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