Cpu; Voltage Requirements; Thermal Requirements - RadiSys PROCELERANT CE915GMA Product Manual

CPU

Voltage requirements

Thermal requirements

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CE915GM modules are available with Intel Pentium M and Celeron M BGA processors to
support different requirements, such as performance, heat dissipation, space limitations,
or voltage needs.
For detailed information on these processors, visit the Intel Web site, www.intel.com.
The processors on CE915GM modules require separate power rails to isolate power for
the internal processor, core PLLs (1.5V), and processor I/O (1.05V).
On-board DC-to-DC switching regulators generate core voltages and processor I/O voltage
from the +12V power supply.
The Intel Pentium M and Celeron M processors support the THERMTRIP# signal for
catastrophic thermal protection. An external thermal sensor
is also implemented to protect the processor and the system against excessive
temperature. If the external thermal sensor detects a catastrophic processor temperature
of 125°C (maximum), or if the THERMATRIP# signal is asserted, the voltage supply to the
processor will be turned off within 500ms to prevent permanent silicon damage due to
thermal runaway of the processor.
The thermal monitor feature and the Thermal Control Circuit (TCC) will be enabled in the
CPU by the board BIOS. The CPU temperature can be read over the SMBus at any time.
The processor must remain within the minimum and maximum junction temperature (Tj)
specifications at the corresponding Thermal Design Power (TDP) value shown in
The TDP is not the maximum theoretical power the processor can dissipate.
Table 4. Thermal requirements for Intel Celeron M and Pentium M processors
Processor Core Frequency and Voltage
Celeron M 370 1.5GHz
Celeron M 373 1.0 GHz, ULV
Pentium M 738 1.4GHz, LV
Pentium M 760 2.2GHz
Note: The TDP specification should be used to design the processor thermal solution. The
Intel Thermal Monitor's automatic mode must be enabled for the processor to operate
within specifications
CPU
(Thermal sensor on page
TDP Tj
21W 100°C
5W 100°C
10W 100°C
27W 100°C
3
33)
Table 4.
27