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ADT7467
THERM LIMIT
programmed value of n. This rate also depends on the
HIGH TEMP
LIMIT
OPERATING
POINT
HYSTERESIS
ACTUAL
TEMP
amount that the temperature has increased between this
monitoring cycle and the last monitoring cycle. For
example, if the temperature has increased by 1 ? C, then T MIN
is reduced by 2 ? C. Decreasing T MIN has the effect of
increasing the fan speed, thus providing more cooling to the
system.
LOW TEMP
LIMIT
T MIN
Figure 71. 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 T MIN value is not adjusted and the fan runs at
a speed determined by the fixed T MIN and T RANGE values,
defined in the automatic fan speed control mode in the
Enhancing System Acoustics section.
Operating Point Exceeded-T MIN Reduced
When the measured temperature is below the operating
point temperature minus the hysteresis, T MIN remains the
same.
Once the temperature exceeds the operating temperature
minus the hysteresis (OP1 ? Hyst), T MIN decreases during
the short cycle (see Figure 69) at a rate determined by the
THERM
LIMIT
HIGH TEMP
LIMIT
If the temperature slowly increases only in the range
(OP1 ? Hyst), that is, the change in temperature is ? 0.25 ? C
per short monitoring cycle, T MIN does not decrease. This
allows small changes in temperature in the desired operating
zone without changing T MIN . The long cycle makes no
change to T MIN in the temperature range (OP ? Hyst),
because the temperature has not exceeded the operating
temperature.
Once the temperature exceeds the operating temperature,
T MIN reduces by 1 ? C per long cycle as long as the
temperature remains above the operating temperature. This
takes place in addition to the decrease in T MIN that occurs
during the short cycle. In Figure 72, because the temperature
is increasing at a rate of ? 0.25 ? C per short cycle, no
reduction in T MIN takes place during the short cycle.
Once the temperature falls below the operating
temperature, T MIN remains fixed, even when the
temperature starts to increase slowly, because the
temperature only increases at a rate of ? 0.25 ? C per cycle.
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 ? C
and T1(n) < OP ? T MIN
stays the same
LOW TEMP
LIMIT
OR 0.75 ? C = > TMIN
Decrease here due to short cycle only
T1(n) ? T1 (n ? 1) = 0.5 ? C
or 0.75 ? C ? T MIN
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 ? T MIN
decreases by 1 ? C every long cycle
Figure 72. Effect of Exceeding Operating Point Minus Hysteresis Temperature
Increasing the T MIN Cycle
When the temperature drops below the low temperature
limit, T MIN can increase during the long cycle. Increasing
T MIN has the effect of running the fan more slowly and,
therefore, more quietly. The long cycle diagram in Figure 70
shows the conditions necessary for T MIN to increase.
T MIN can increase if:
? The measured temperature falls below the low
temperature limit. This means that 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.
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