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ADT7467
120
140
As Figure 75 to Figure 78 show, the rate at which the fan
100
80
60
40
R TEMP ( ? C)
PWM DUTY CYCLE (%)
120
100
80
60
40
reacts to a temperature change is dependent on the ramp rate
selected in the enhanced acoustics registers. The higher the
ramp rate, the faster the fan reaches the newly calculated fan
speed.
Figure 79 shows the behavior of the PWM output as
temperature varies. As the temperature increases, the fan
speed ramps up. Small drops in temperature do not affect the
ramp-up function because the newly calculated fan speed is
higher than the previous PWM value. Enhanced acoustics
20
TIME (s)
20
0 0
0 4.4
Figure 76. Enhanced Acoustics Mode with Ramp
Rate = 8
mode allows the PWM output to be made less sensitive to
temperature variations. This is dependent on the ramp rate
selected and programmed into the enhanced acoustics
registers.
90 90
Figure 77 shows the PWM output response for a ramp rate
of 2. With these conditions, the fan takes about 17.6 sec to
reach full running speed.
80
70
60
PWM DUTY CYCLE (%)
80
70
60
140
120
100
80
60
R TEMP ( ? C)
PWM DUTY CYCLE (%)
120
100
80
60
50
40
30
20
10
0
R TEMP ( ? C)
50
40
30
20
10
0
40
20
40
20
TIME (s)
Figure 79. Fan Reaction to Temperature Variation
in Enhanced Acoustics Mode
TIME (s)
0 0
0 17.6
Figure 77. Enhanced Acoustics Mode with Ramp
Rate = 2
Figure 78 shows how the control loop reacts to
temperature with the slowest ramp rate. The ramp rate is set
to 1; all other control parameters are the same as they are for
Figure 75 through Figure 77. With the slowest ramp rate
selected, it takes 35 sec for the fan to reach full speed.
Slower Ramp Rates
The ADT7467 can be programmed for much longer ramp
times by slowing the ramp rates. Each ramp rate can be
slowed by a factor of 4.
PWM1 Configuration Register (0x5C)
<3> SLOW, a setting of 1 slows the ramp rate for PWM1 by 4.
PWM2 Configuration Register (0x5D)
<3> SLOW, a setting of 1 slows the ramp rate for PWM2 by 4.
120
100
80
60
40
20
R TEMP ( ? C)
PWM DUTY CYCLE (%)
140
120
100
80
60
40
20
PWM3 Configuration Register (0x5E)
<3> SLOW, a setting of 1 slows the ramp rate for PWM3 by 4.
The following sections list the ramp ? up times when the
SLOW bit is set for each PWM output.
Enhanced Acoustics Register 1 (0x62)
<2:0> ACOU selects the ramp rate for PWM1.
000 = 140 sec
001 = 70.4 sec
010 = 47.2 sec
011 = 28 sec
0
0
TIME (s)
35
0
100 = 17.6 sec
101 = 12 sec
Figure 78. Enhanced Acoustics Mode with Ramp
Rate = 1
110 = 6.4 sec
111 = 3.2 sec
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