Frequency/Vid Control; Clock Modulation; Catastrophic Cooling Failure Sensor - Kontron CP3002 User Manual

Thermal Considerations
The processor core power reduction is achieved by:
• Frequency/VID Control (by reducing of processor core voltage)
• Clock Modulation (by turning the internal processor core clocks off and on)
Adaptive Thermal Monitor dynamically selects the appropriate method. uEFI BIOS is not re-
quired to select a specific method as with previous-generation processors supporting Intel®
Thermal Monitor 1 (TM1) and Intel® Thermal Monitor 2 (TM2).
The Adaptive Thermal Monitor does not require any additional hardware, software drivers, or
interrupt handling routines.
6.2.3

Frequency/VID Control

Frequency/VID Control reduces the processor's operating frequency (using the core ratio mul-
tiplier) and the input voltage (using VID signals). This combination of lower frequency and VID
results in a reduction of the processor power consumption. This method is similar to Intel®
Thermal Monitor 2 (TM2) in previous generation processors.
Running the processor at the lower frequency and voltage will reduce power consumption and
should allow the processor to cool off. If the processor temperature does not drop below the
TCC activation point, a second frequency and voltage transition will take place. This sequence
of temperature checking and Frequency/VID reduction will continue until either the minimum
frequency has been reached or the processor temperature has dropped below the TCC activa-
tion point. If the processor temperature remains above the TCC activation point even after the
minimum frequency has been reached, then Clock Modulation at that minimum frequency will
be initiated.
Note ...
When the TH LED on the front panel is lit red after boot-up, it indicates that the
processor die temperature is above 105°C or the graphics and memory control-
ler die temperature is above 100°C.
6.2.4

Clock Modulation

Clock Modulation reduces power consumption by rapidly turning the internal processor core
clocks off and on at a duty cycle that should reduce power dissipation (typically a 30-50% duty
cycle). This method is similar to Intel® Thermal Monitor 1 (TM1) in previous generation proces-
sors.
Once the temperature has dropped below the maximum operating temperature, the TCC goes
inactive and clock modulation ceases.
Note ...
When the TH LED on the front panel is lit red after boot-up, it indicates that the
processor die temperature is above 105°C or the graphics and memory control-
ler die temperature is above 100°C.
6.2.5

Catastrophic Cooling Failure Sensor

The Catastrophic Cooling Failure Sensor protects the processor from catastrophic overheating.
The Catastrophic Cooling Failure Sensor threshold is set well above the normal operating tem-
perature to ensure that there are no false trips. The processor will stop all executions when the
junction temperature exceeds approximately 125°C. Once activated, the event remains
latched until the CP3002 undergoes a power-on restart (all power off and then on again).
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CP3002
ID 1042-9252, Rev. 2.0