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ADT7467
Short Cycle and Long Cycle
The ADT7467 implements two loops: a short cycle and a
long cycle. The short cycle takes place 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:
Table 39. CYCLE BIT ASSIGNMENTS
Remote 1 = CYR1 = Bits <2:0> of Dynamic T MIN Control
Register 2 (Address 0x37)
Local = CYL = Bits <5:3> of Dynamic T MIN Control
Register 2 (Address 0x37)
Remote 2 = CYR2 = Bits <7:6> of Dynamic T MIN Control
Register 2 and Bit 0 of Dynamic T MIN Control Register 1
(0x36)
Code
Short Cycle
Long Cycle
000
001
010
011
100
101
110
111
8 cycles
16 cycles
32 cycles
64 cycles
128 cycles
256 cycles
512 cycles
1024 cycles
(1 sec)
(4 sec)
(4 sec)
(8 sec)
(16 sec)
(32 sec)
(64 sec)
(128 sec)
16 cycles
32 cycles
64 cycles
128 cycles
256 cycles
512 cycles
1024 cycles
2048 cycles
(2 sec)
(2 sec)
(8 sec)
(16 sec)
(32 sec)
(64 sec)
(128 sec)
(256 sec)
NO
Is T1(n) >
Operating
(OP1 ? HYS)
OP1
Previous
Is
Temperature
T1(n) ? T1(n ? 1)
? 0.25 ? C
Is
YES
Decrease
T MIN by 1 ? C
Operating
NO
YES
Increase
T MIN by 1 ? C
Do Not
Care should be taken when choosing the cycle time. A
long cycle time means that T MIN is updated less often. If a
system has very fast temperature transients, the dynamic
T MIN control loop lags. If a cycle time is chosen that is too
fast, the full benefit of changing T MIN might not be realized
and will need to change upon the next cycle; in effect, it is
overshooting. Some calibration is necessary to identify the
most suitable response time.
Figure 69 shows the steps taken during the short cycle.
Wait n
Monitoring
Cycles
Current
Temperature
Measurement
T1(n)
Do Nothing
Point
Temperature
YES
Do Nothing
YES (System is
Measurement Cooling Off
T1 (n – 1) for Constant)
NO
Is T1(n) ? T1(n ? 1) = 0.5 ? 0.75 ? C Decrease T MIN by 1 ? C
Is T1(n) ? T1(n ? 1) = 1.0 ? 1.75 ? C Decrease T MIN by 2 ? C
IS T1(n) ? T1(n ? 1) > 2.0 ? C Decrease T MIN by 4 ? C
Figure 69. Short Cycle Steps
Figure 70 shows the steps taken during the long cycle.
Wait 2n
Monitoring
Cycles
Current
Temperature
Measurement
T1(n)
T1(n) > OP1
Point
Temperature
OP1
Is T1(n) < Low Temp Limit
AND
T MIN < High Temp Limit
AND
T MIN < OP1
AND
T1(n) > T MIN
NO
Change
Figure 70. Long Cycle Steps
The following examples illustrate circumstances that may
cause T MIN to increase, decrease, or stay the same.
Normal Operation-No T MIN Adjustment
? If measured temperature never exceeds the
programmed operating point minus the hysteresis
temperature, T MIN is not adjusted, that is, it remains at
its current setting.
? If measured temperature never drops below the low
temperature limit, T MIN is not adjusted.
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