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ADT7490
100%
0%
T MIN
THERMAL CALIBRATION
100%
PWM
MIN
PWM
CONFIG
RAMP
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM1
REMOTE2 =
CPU TEMP
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
PWM
MIN
TACHOMETER1
MEASUREMENT
PWM
CONFIG
RAMP
TACH1
CPU FAN SINK
MUX
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM2
T MIN
T RANGE
0%
PWM
TACHOMETER2
MEASUREMENT
TACH2
LOCAL =
VRM TEMP
THERMAL CALIBRATION
100%
MIN
PWM
CONFIG
RAMP
FRONT CHASSIS
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM3
T MIN
T RANGE
0%
TACHOMETER3
AND 4
MEASUREMENT
TACH3
REMOTE1 =
AMBIENT TEMP
Figure 49. Understanding the T MIN Parameter
REAR CHASSIS
Step 4: PWM MIN for Each PWM (Fan) Output
PWM MIN is the minimum PWM duty cycle at which each
fan in the system runs. It is also the start speed for each fan
under automatic fan control once the temperature rises
above T MIN . For maximum system acoustic benefit,
PWM MIN should be as low as possible. Depending on the
fan used, the PWM MIN setting is usually in the 20% to 33%
duty cycle range. This value can be found through fan
validation.
100%
PWM MIN
0%
More than one PWM output can be controlled from a
single temperature measurement channel. For example,
Remote 1 temperature can control PWM1 and PWM2
outputs. If two different fans are used on PWM1 and PWM2,
the fan characteristics can be set up differently. As a result,
Fan 1 driven by PWM1 can have a different PWM MIN value
than that of Fan 2 connected to PWM2. Figure 51 illustrates
this as PWM1 MIN (front fan) turned on at a minimum duty
cycle of 20%, while PWM2 MIN (rear fan) is turned on at a
minimum of 40% duty cycle. Note that both fans turn on at
exactly the same temperature, defined by T MIN .
T MIN
TEMPERATURE
Figure 50. PWM MIN Determines Minimum
PWM Duty Cycle
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