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ADT7462ACPZ-R7 数据表(PDF) 48 Page - ON Semiconductor

部件名 ADT7462ACPZ-R7
功能描述  Flexible Temperature, Voltage Monitor, and System Fan Controller
PDF  81 Pages
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制造商  ONSEMI [ON Semiconductor]
网页  http://www.onsemi.com
标志 ONSEMI - ON Semiconductor

ADT7462ACPZ-R7 数据表(HTML) 48 Page - ON Semiconductor

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48
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.
Figure 79. Enhanced Acoustics Mode with Ramp
Rate = 2
TIME (s)
140
0
17.6
120
100
80
0
120
100
80
60
0
RTEMP (5C)
PWM DUTY CYCLE (%)
40
20
60
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.
Figure 80. Enhanced Acoustics Mode with Ramp
Rate = 1
TIME (s)
0
35
120
100
80
60
40
20
0
140
120
100
80
60
40
20
0
RTEMP (5C)
PWM DUTY CYCLE (%)
As Figure 77 to Figure 80 show, the rate at which the fan
reacts to 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 81 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 still higher than the previous PWM value. Enhanced
acoustics 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.
Figure 81. How Fan Reacts to Temperature Variations
in Enhanced Acoustics Mode
90
60
0
30
20
10
PWM DUTY CYCLE (%)
RTEMP (5C)
80
70
50
40
Slower Ramp Rates
The ADT7462 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 (0x21)
PWM2 Configuration Register (0x22)
PWM3 Configuration Register (0x23)
PWM4 Configuration Register (0x24)
Setting Bit 3 (the SLOW bit) to 1 in the PWM1 to PWM4
configuration registers slows the ramp rate for PWM1 to
PWM4 by 4.
Fan Freewheeling Test Mode
The fan freewheeling test mode is intended to diagnose
whether fans connected to the ADT7462 are working
properly. It is particularly useful where fans coupled in the
duct can affect the airflow of another fan. If one fan has
failed, it may not be apparent, because moving air from other
fans can cause air to flow through the faulty fan, which in
turn can cause the faulty fan to rotate.
The fan freewheeling test is most useful in a system using
primary and redundant setup. In such a system, the
following setup is recommended. The primary fans are
Fan 1, Fan 2, Fan 3, and Fan 4. The redundant fans are Fan 5,
Fan 6, Fan 7, and Fan 8. In this setup, each primary and
redundant fan can be driven separately because they are
driven by different PWMs.
Figure 82. Fan Freewheeling Test Mode Setup
PWM 1
PWM 2
PWM 3
PWM 4
TACH CCT 1
TACH CCT 2
TACH CCT 3
TACH CCT 4
FAN 1
FAN 2
FAN 3
FAN 4
FAN 5
FAN 6
FAN 7
FAN 8



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