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ADT7462ACPZ-R7 Datasheet(PDF) 35 Page - ON Semiconductor

Part # ADT7462ACPZ-R7
Description  Flexible Temperature, Voltage Monitor, and System Fan Controller
PDF  81 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

ADT7462ACPZ-R7 Datasheet(HTML) 35 Page - ON Semiconductor

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ADT7462
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35
Figure 53. Understanding the TMIN Parameter
REAR CHASSIS
FRONT CHASSIS
CPU FAN SINK
LOCAL =
VRM TEMP
PWM1
PWM2
TACH1
TACH2
TACH3
PWM3
REMOTE 1 =
AMBIENT TEMP
REMOTE 2 =
CPU TEMP
MUX
THERMAL CALIBRATION
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
TACHOMETER 1
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
TACHOMETER 2
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
TACHOMETER 3
AND 4
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
100%
0%
100%
TMIN
Step 3—PWMMIN for Each PWM (Fan) Output
PWMMIN 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 when the temperature rises
above TMIN. For maximum system acoustic benefit,
PWMMIN should be as low as possible. Depending on the
fan used, the PWMMIN setting is usually in the 20% to 33%
duty cycle range. This value can be found through fan
validation.
Figure 54. PWMMIN Determines Minimum
PWM Duty Cycle
TEMPERATURE
TMIN
100%
PWMMIN
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 PWMMIN
value than that of Fan 2 connected to PWM2. Figure 55
illustrates this as PWM1MIN (the front fan) turns on at a
minimum duty cycle of 20%, while PWM2MIN (the rear fan)
turns on at a minimum duty cycle of 40%. Note, however,
that both fans turn on at exactly the same temperature,
defined by TMIN.
Figure 55. Operating Two Different Fans from a
Single Temperature Channel
TEMPERATURE
TMIN
100%
PWM1MIN
0%
PWM1
PWM2
PWM2MIN



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