Intel Pentium M Processor with 2-MB L2 Cache and 533-MHz Front Side Bus Datasheet

64 Datasheet
Thermal Specifications and Design Considerations
Besides the thermal sensor and thermal control circuit, the Intel Thermal Monitor thermal monitor
feature also includes one ACPI register, one performance counter register, three model specific
registers (MSR), and one I/O pin (PROCHOT#). All are available to monitor and control the state
of the Intel Thermal Monitor feature. The Intel Thermal Monitor can be configured to generate an
interrupt upon the assertion or deassertion of PROCHOT#.
Note: PROCHOT# will not be asserted when the processor is in the Stop Grant, Sleep, Deep Sleep, and
Deeper Sleep low power states (internal clocks stopped), hence the thermal diode reading must be
used as a safeguard to maintain the processor junction temperature within the 100 °C (maximum)
specification. If the platform thermal solution is not able to maintain the processor junction
temperature within the maximum specification, the system must initiate an orderly shutdown to
prevent damage. If the processor enters one of the above low power states with PROCHOT#
already asserted, PROCHOT# will remain asserted until the processor exits the low power state
and the processor junction temperature drops below the thermal trip point.
If automatic mode is disabled, the processor will be operating out of specification. Regardless of
enabling the automatic or on-demand modes, in the event of a catastrophic cooling failure, the
processor will automatically shut down when the silicon has reached a temperature of
approximately 125 °C. At this point the THERMTRIP# signal will go active. THERMTRIP#
activation is independent of processor activity and does not generate any bus cycles. When
THERMTRIP# is asserted, the processor core voltage must be shut down within the time specified
in Chapter 3.
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