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ADT7473
2. As the temperature in that zone (Remote 1
temperature) rises toward and exceeds the
operating point temperature, T MIN is reduced, and
the fan speed increases.
3. As the temperature drops below the operating
point temperature, T MIN is increased, and the fan
speed is reduced.
However, the loop operation is not as simple as described
in these steps. A number of conditions govern the situations
in which T MIN can increase or decrease.
CURRENT
TEMPERATURE
MEASUREMENT
T1(n)
OPERATING
POINT
TEMPERATURE
OP1
PREVIOUS
TEMPERATURE
MEASUREMENT
T1 (n ? 1)
WAIT n
MONITORING
CYCLES
IS T1(n) >
(OP1 ? HYS)
YES
IS T1(n) ? T1(n ? 1)
≤ 0.25 5 C
NO
NO
YES
DO NOTHING
DO NOTHING
(SYSTEM IS
COOLING OFF
FOR CONSTANT)
Short Cycle and Long Cycle
The ADT7473/ADT7473 ? 1 implements two loops: a
short cycle and a long cycle. The short cycle takes place
IS T1(n) - T1(n - 1) = 0.5 - 0.75 5 C
IS T1(n) - T1(n - 1) = 1.0 - 1.75 5 C
IS T1(n) - T1(n - 1) > 2.0 5 C
DECREASE T MIN BY 1 5 C
DECREASE T MIN BY 2 5 C
DECREASE T MIN BY 4 5 C
every n monitoring cycles. The long cycle takes place every
2n monitoring cycles. The value of n is programmable for
each temperature channel. The bits are located at the
following register locations:
Remote 1 = CYR1 = Bits <2:0> of Dynamic T MIN Control
Register 2 (0x37).
Figure 68. Short Cycle Steps
Figure 69 shows the steps taken during the long cycle.
WAIT 2n
MONITORING
CYCLES
Local = CYL = Bits <5:3> of Dynamic T MIN Control
Register 2 (0x37).
Remote 2 = CYR2 = Bits <7:6> of Dynamic T MIN Control
Register 2 (0x37) and Bit 0 of Dynamic T MIN Control
Register 1 (0x36).
CURRENT
TEMPERATURE
MEASUREMENT
T1(n)
OPERATING
POINT
TEMPERATURE
OP1
IS T1(n) > OP1
NO
YES
DECREASE T MIN
BY 1 5 C
Table 52. CYCLE BI T ASSIGNMENTS
Code Short Cycle Secs Long Cycle
000 8 cycles 1 sec 16 cycles
001 16 cycles 2 sec 32 cycles
010 32 cycles 4 sec 64 cycles
Secs
2 sec
4 sec
8 sec
IS T1(n) < LOW TEMP LIMIT
AND
T MIN < HIGH TEMP LIMIT
AND
T MIN < OP1
AND
T1(n) > T MIN
NO
YES
INCREASE
T MIN BY 1 5 C
DO NOT
CHANGE
011
64 cycles
8 sec
128 cycles
16 sec
100
101
110
111
128 cycles
256 cycles
512 cycles
1024 cycles
16 sec
32 sec
64 sec
128 sec
256 cycles
512 cycles
1024 cycles
2048 cycles
32 sec
64 sec
128 sec
256 sec
Figure 69. Long Cycle Steps
The following examples illustrate some of the
circumstances that might cause T MIN to increase, decrease,
or stay the same.
Care should be taken when choosing the cycle time. A
long cycle time means that T MIN is updated less often. If
your system has very fast temperature transients, the
dynamic T MIN control loop is always lagging. If a cycle time
is chosen that is too fast, the full benefit of changing T MIN
might not be realized and needs to change again on the next
cycle; in effect, it is overshooting. It is necessary to carry out
some calibration to identify the most suitable response time.
Example 1: Normal Operation ? No T MIN Adjustment
? If measured temperature never exceeds the
programmed operating point minus the hysteresis
temperature, then T MIN is not adjusted; that is, it
remains at its current setting.
? If measured temperature never drops below the low
temperature limit, then T MIN is not adjusted.
Figure 68 shows the steps taken during the short cycle.
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