3
CPU
27
CPU
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
.
Voltage requirements
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.
Thermal requirements
The Intel Pentium M and Celeron M processors support the THERMTRIP# signal for
catastrophic thermal protection. An external thermal sensor (
Thermal sensor
on page 33
)
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
Table 4
.
The TDP is not the maximum theoretical power the processor can dissipate.
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
Table 4. Thermal requirements for Intel Celeron M and Pentium M processors
Processor
Core Frequency and Voltage
TDP
Tj
Celeron M 370
1.5GHz
21W
100°C
Celeron M 373
1.0 GHz, ULV
5W
100°C
Pentium M 738
1.4GHz, LV
10W
100°C
Pentium
M 760
2.2GHz
27W
100°C
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