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ADT7490ARQZ-R7 Datasheet(PDF) 36 Page - ON Semiconductor

Part # ADT7490ARQZ-R7
Description  dBCool Remote Thermal Monitor and Fan Controller with PECI Interface
PDF  75 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

ADT7490ARQZ-R7 Datasheet(HTML) 36 Page - ON Semiconductor

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36
Figure 49. 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
PWM
MIN
PWM
MIN
PWM
MIN
100%
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM
GENERATOR
TACHOMETER 3
AND 4
MEASUREMENT
TACHOMETER 1
MEASUREMENT
TACHOMETER 2
MEASUREMENT
PWM
GENERATOR
PWM
CONFIG
PWM
CONFIG
PWM
CONFIG
0%
100%
TMIN
Step 4: 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 once 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 50. 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 51 illustrates
this as PWM1MIN (front fan) turned on at a minimum duty
cycle of 20%, while PWM2MIN (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 TMIN.



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