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ADT7473
Enhanced Acoustics Register 2 (0x63)
Bits <2:0> ACOU3, select the ramp rate for PWM3.
000 = 1 time slot = 35 sec
001 = 2 time slots = 17.6 sec
010 = 3 time slots = 11.8 sec
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.
011 = 5 time slots = 7 sec
100 = 8 time slots = 4.4 sec
101 = 12 time slots = 3 sec
110 = 24 time slots = 1.6 sec
111 = 48 time slots = 0.8 sec
Bits <6:4> ACOU2, select the ramp rate for PWM2.
000 = 1 time slot = 35 sec
001 = 2 time slots = 17.6 sec
010 = 3 time slots = 11.8 sec
011 = 5 time slots = 7 sec
100 = 8 time slots = 4.4 sec
101 = 12 time slots = 3 sec
120
100
80
60
40
20
R TEMP ( ? C)
PWM DUTY CYCLE (%)
140
120
100
80
60
40
20
110 = 24 time slots = 1.6 sec
111 = 48 time slots = 0.8 sec
0
0
TIME (s)
4.4
0
100
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 ADT7473/ADT7473 ? 1 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 1 time slot is selected.
Figure 77 shows remote temperature plotted against
PWM duty cycle for enhanced acoustics mode. The ramp
Figure 78. Enhanced Acoustics Mode with
Ramp Rate = 8
Figure 79 shows the PWM output response for a ramp rate
of 2. In this instance, the fan takes about 17.6 seconds to
reach full running speed.
140 120
R TEMP ( ? C)
120
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.
100
80
60
40
PWM DUTY CYCLE (%)
80
60
40
140
120
100
80
R TEMP ( ? C)
120
100
80
60
20
0
0 17.6
TIME (s)
Figure 79. Enhanced Acoustics Mode with
Ramp Rate = 2
20
0
60
40
20
PWM CYCLE (%)
40
20
Figure 80 shows how the control loop reacts to
temperature with the slowest ramp rate. The ramp rate is set
to 1, while all other control parameters remain the same.
With the slowest ramp rate selected, it takes 35 seconds for
the fan to reach full speed.
0
0
TIME (s)
0
0.76
Figure 77. Enhanced Acoustics Mode with
Ramp Rate = 48
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