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Microchip Thermal Management Utility
2019 Microchip Technology Inc.
DS50002905A-page 19
3.3.5
Fan Related Options
The Fan Related Options section is marked by the number
5
.
3.3.5.1
DETECT FAN MIN/MAX BUTTON
The
Detect Fan Min/Max
button opens a dialog box (
), which allows the
detection of the minimum and maximum RPM (Revolutions Per Minute) values for the
fan. It is initially set to the minimum drive value (configured in the
Fan Driver
tab under
the “Min Drive” percentage field), the RPM being measured subsequently. If the fan
doesn’t start, then the Min Drive percentage is increased with the selected PWM step
until the fan starts. After the minimum RPM, Valid Tachometer Count and Minimum
Drive values are determined, they are stored. In order to determine the maximum RPM
value, the fan drive is set to 100% and the RPM is measured. Note that the maximum
RPM value detected can be slightly lower than the fan specification.
Note that the IC does not automatically determine the Min and Max values. This is done
by software and is automated for the user’s convenience.
FIGURE 3-4:
Determine Fan Min/Max RPM Dialog Box.