BDM-610000075
Rev B
Chapter 4: Using the cpuModule
81
Thermal Management
The cpuModule has several thermal features which can be used to monitor and control the board’s temperature
when extreme operating conditions are prevalent.
Thermal Monitor
The Intel ® Thermal Monitor is a feature on the CMX32M that automatically throttles the CPU when the CPU
exceeds its thermal limit. The maximum temperature of the processor is defined as the temperature that the
Thermal Monitor is activated. The thermal limit and duty cycle of the Thermal Monitor cannot be modified,.
Fan Mode
The CPU fan can be controlled by the CPU when connected to the switched fan power connector (
CN15
). Three
fan modes are supported, which can be toggled in the BIOS setup. When the fan is not always on, the CPU’s
power consumption is reduced, and the life of the fan is increased.
•
Always On:
When in this mode, the fan is always powered by the CPU.
•
On At 70C:
This mode allows the system to keep the fan turned off until the CPU reaches 70C. In this
mode, the fan will slowly transition between on and off to prevent oscillations. This is the best mode
for applications that will spend most of the time below 0C.
•
Variable:
The fan will spin slowly until the CPU reaches 60C, and then will increase speed. Maximum
speed is reached when the CPU reaches 75C.
Further Temperature Reduction
The cpuModule’s temperature is directly related to power consumption. Reducing the power consumption of
the CPU will have an effect on the CPU’s temperature. Suggested methods for reducing the CPU’s power
consumption can be found in the
section on page 82.
Note
The CPU and PCB temperatures displayed in the BIOS are approximate and should not be used to
validate a cooling solution.
Summary of Contents for BDM-610000075
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