Thermal Considerations
CP307
Page 6 - 4
ID 34424, Rev. 3.0
P R E L I M I N A R Y
6.1.2
CPU Emergency Thermal Supervision (Thermtrip)
This function cannot be enabled or disabled in the BIOS. It is always enabled to ensure that the
processor is protected in any event.
Assertion of Thermtrip indicates that the processor junction temperature has reached a level
beyond which permanent silicon damage may occur. Measurement of the temperature is ac-
complished through an internal thermal sensor which is configured to trip at approximately
125°C. Upon assertion of Thermtrip, the processor will shut off its internal clocks (thus halting
program execution) in an attempt to reduce the processor junction temperature. Once activat-
ed, Thermtrip remains latched until the CP307 undergoes a cold restart (all power off and then
on again).
6.1.3
Thermal Management Recommendations
If the CP307 is operated in a properly configured CompactPCI environment with enough air-
flow, there is no need to enable the Thermal Management function. However, sometimes the
system environment is not optimized for an Intel® Core™ Duo or an Intel® Core™2 Duo pro-
cessor board and this requires thermal protection to guarantee a stable system. The Thermal
Management feature allows system designers to design lower cost thermal solutions without
compromising system integrity or reliability.
If the system environment is not optimized for the CP307, the internal Thermal Monitor should
be enabled. The internal Thermal Monitor protects the processor and the system against ex-
cessive temperatures. In this configuration the clocks will be switched off and on. For example,
at a 50% duty cycle, the average power dissipation can drop by up to 50%. In this case, the
processor performance also drops by about 50%.
6.2
External Thermal Regulation
The thermal management concept of the CP307 also encompasses external thermal regula-
tion. For the Intel® Core™ Duo and Intel® Core™2 Duo processors, a specifically designed
heat sink is employed to ensure the best possible basis for operational stability and long-term
reliability. Coupled together with system chassis which provide variable configurations for
forced airflow, thermal energy dissipation is guaranteed.
6.2.1
Heat Sink
Even though the CP307 is fitted with an optimally designed passive heat sink, it still requires
forced airflow which must be provided by the CompactPCI system. For the minimum airflow re-
quired, refer to the thermal characteristic graphs in this chapter.
Note ...
Upon assertion of Thermtrip, the front panel overtemperature LED flashes at
regular intervals.
Warning!
For Benchmarks and performance tests the CPU internal Thermal Supervision
should be disabled; if enabled, the results will be erroneous due to the thermal
power reduction.
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