参数资料
| 型号： | ADT7462ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 48/82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
previous PWM value, the previous PWM duty cycle is
decremented by 1, 2, 3, 5, 8, 12, 24, or 48 time slots. Each
time the PWM duty cycle is incremented or decremented, its
value is stored as the previous PWM duty cycle for the next
comparison.
A ramp rate of 1 corresponds to one time slot, which is
1/255 of the PWM period. In enhanced acoustics mode,
incrementing or decrementing by 1 changes the PWM
output by 1/255 ? 100%.
Step 11 ? Ramp Rate for Acoustic Enhancement
The optimal ramp rate for acoustic enhancement can be
found through system characterization after the thermal
optimization has been finished. The effect of each ramp rate
should be logged, if possible, to determine the best setting
for a given solution.
Another way to view the ramp rates is to measure the time
it takes for the PWM output to ramp up from 0% to 100%
duty cycle for an instantaneous change in temperature. This
can be tested by putting the ADT7462 into manual mode and
changing the PWM output from 0% to 100% PWM duty
cycle. The PWM output takes 35 seconds to reach 100%
when a ramp rate of one time slot is selected.
Figure 77 shows remote temperature plotted against PWM
duty cycle for enhanced acoustics mode. The ramp rate is set
to 48, which corresponds to the fastest ramp rate. Assume that
a new temperature reading is available every 115 ms. With
these settings, it takes approximately 0.76 seconds to go from
33% duty cycle to 100% duty cycle (full speed). Even though
the temperature increases very rapidly, the fan ramps up to
full speed gradually.
140 120
Enhanced Acoustics Register 1 (0x1A)
Bits [4:2] RR1 select the ramp rate for PWM1.
000 = 1 time slot = 35 seconds
001 = 2 time slots = 17.6 seconds
010 = 3 time slots = 11.8 seconds
011 = 5 time slots = 7 seconds
100 = 8 time slots = 4.4 seconds
101 = 12 time slots = 3 seconds
110 = 24 time slots = 1.6 seconds
111 = 48 time slots = 0.8 seconds
120
100
80
60
40
20
R TEMP ( ? C)
PWM CYCLE (%)
100
80
60
40
20
Bits [7:5] RR2 s elect the ramp rate for PWM2.
000 = 1 time slot = 35 seconds
001 = 2 time slots = 17.6 seconds
0
0
TIME (s)
0
0.76
010 = 3 time slots = 11.8 seconds
011 = 5 time slots = 7 seconds
100 = 8 time slots = 4.4 seconds
101 = 12 time slots = 3 seconds
110 = 24 time slots = 1.6 seconds
111 = 48 time slots = 0.8 seconds
Enhanced Acoustics Register 2 (0x1B)
Figure 77. Enhanced Acoustics Mode with Ramp
Rate = 48
Figure 78 shows how changing the ramp rate from 48 to
8 affects the control loop. The overall response of the fan is
slower. Because the ramp rate is reduced, it takes longer for
the fan to achieve full running speed. In this case, it takes
approximately 4.4 seconds for the fan to reach full speed.
Bits [4:2] RR3 select the ramp rate for PWM3.
000 = 1 time slot = 35 seconds
001 = 2 time slots = 17.6 seconds
010 = 3 time slots = 11.8 seconds
011 = 5 time slots = 7 seconds
100 = 8 time slots = 4.4 seconds
101 = 12 time slots = 3 seconds
110 = 24 time slots = 1.6 seconds
111 = 48 time slots = 0.8 seconds
Bits [7:5] RR4 select the ramp rate for PWM4.
000 = 1 time slot = 35 seconds
001 = 2 time slots = 17.6 seconds
120
100
80
60
40
20
R TEMP ( ? C)
PWM DUTY CYCLE (%)
140
120
100
80
60
40
20
010 = 3 time slots = 11.8 seconds
011 = 5 time slots = 7 seconds
100 = 8 time slots = 4.4 seconds
101 = 12 time slots = 3 seconds
110 = 24 time slots = 1.6 seconds
0 0
0 4.4
TIME (s)
Figure 78. Enhanced Acoustics Mode with Ramp
Rate = 8
111 = 48 time slots = 0.8 seconds
http://onsemi.com
48
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