参数资料
| 型号： | ADT7462ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 44/82页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADT7462 |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 类型： | 温度传感器 |
| 适用于相关产品： | ADT7462 |
| 所含物品： | 评估板 |
| 其它名称： | EVAL-ADT7462EBZ EVAL-ADT7462EBZ-ND |
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ADT7462
Table 29. CYCLE BIT ASSIGNMENTS
Short Long
Code Cycle Duration Cycle
000 8 cycles 1 sec 16 cycles
001 16 cycles 2 sec 32 cycles
Duration
2 sec
4 sec
The following examples illustrate some of the
circumstances that may cause T MIN to increase, decrease, or
stay the same.
Example 1: Normal Operation, No T MIN Adjustment
1. If the measured temperature never exceeds the
programmed operating point minus the hysteresis
010
011
100
101
110
111
32 cycles
64 cycles
128 cycles
256 cycles
512 cycles
1024 cycles
4 sec
8 sec
16 sec
32 sec
64 sec
128 sec
64 cycles
128 cycles
256 cycles
512 cycles
1024 cycles
2048 cycles
8 sec
16 sec
32 sec
64 sec
128 sec
256 sec
temperature, T MIN is not adjusted; that is, it
remains at its current setting.
2. If the measured temperature never drops below the
low temperature limit, T MIN is not adjusted.
THERM LIMIT
HIGH TEMP LIMIT
OPERATING
The cycle time must be chosen carefully. A long cycle
POINT
HYSTERESIS
time means that T MIN is updated less often. If a system has
very fast temperature transients, the dynamic T MIN control
loop is always lagging. If a cycle time that is too short is
chosen, the full benefit of changing T MIN is not realized and
T MIN 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.
Figure 68 shows the steps taken during the short cycle.
ACTUAL TEMP
LOW TEMP LIMIT
T MIN
Figure 70. Temperature Between the Operating Point
and the Low Temperature Limit
Because neither the operating point minus the hysteresis
IS T1(n) – T1(n – 1)
CURRENT
TEMPERATURE
MEASUREMENT
T1(n)
OPERATING
POINT
TEMPERATURE
OP1
PREVIOUS
TEMPERATURE
MEASUREMENT
T1 (n – 1)
WAIT n
MONITORING
CYCLES
IS T1(n) > NO
(OP1 – HYS)
YES
YES
≤ 0.25°C
NO
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
DO NOTHING
DO NOTHING
(SYSTEM
COOLING IS OFF
OR CONSTANT)
DECREASE T MIN BY 1 5 C
DECREASE T MIN BY 2 5 C
DECREASE T MIN BY 4 5 C
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.
Example 2: 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 (OP ? Hyst), T MIN starts
to decrease as illustrated in Figure 71. This occurs during the
short cycle (see Figure 68). The rate at which T MIN
decreases depends on the programmed value of n. It also
YES
DECREASE T MIN
NO
T MIN BY 1 5 C
Figure 68. Short Cycle Steps
Figure 69 shows the steps taken during the long cycle.
WAIT 2n
MONITORING
CYCLES
CURRENT
TEMPERATURE
MEASUREMENT
T1(n)
IS T1(n) > OP1
OPERATING BY 1 5 C
POINT
TEMPERATURE
OP1
IS T1(n) < LOW TEMP LIMIT
AND
T MIN < HIGH TEMP LIMIT YES INCREASE
AND
T MIN < OP1
AND
T1(n) > T MIN
NO DO NOT
CHANGE
Figure 69. Long Cycle Steps
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 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.
If the temperature is slowly increasing only in the range
(OP ? Hyst), that is, ? 0.25 ? C per short monitoring cycle,
then 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.
When the temperature exceeds the operating temperature,
the long cycle causes T MIN 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
T MIN that would occur due to the short cycle. In Figure 70,
because the temperature is increasing at a rate ? 0.25 ? C per
short cycle, no reduction in T MIN takes place during the
short cycle.
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44
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| ADT7463 | 制造商:AD 制造商全称:Analog Devices 功能描述:dB COOL Remote Thermal Controller and Voltage Monitor |
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