T2500 datasheet(89/91 Pages) INTEL

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Thermal Specifications and Design Considerations

if the system tries to enable the TCC via on-demand mode at the same time automatic

mode is enabled and a high temperature condition exists, automatic mode will take

precedence.

An external signal, PROCHOT# (processor hot) is asserted when the processor detects

that its temperature is above the thermal trip point. Bus snooping and interrupt

latching are also active while the TCC is active.

Besides the thermal sensor and thermal control circuit, the Intel Thermal Monitor 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 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 Intel Thermal Monitor 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.

5.1.4

Digital Thermal Sensor (DTS)

The processor also contains an on-die DTS that can be read via a MSR (no I/O

interface). In a dual core implementation of the Intel Core Duo processor, each core will

have a unique DTS whose temperature is accessible via processor MSR. The DTS is the

preferred method of reading the processor die temperature since it can be located

much closer to the hottest portions of the die and can thus more accurately track the

die temperature and potential activation of processor core clock modulation via the

Intel Thermal Monitor. The DTS is only valid while the processor is in the normal

operating state (C0 state).

Unlike traditional thermal devices, the DTS will output a temperature relative to the

maximum supported operating temperature of the processor (TJ,max). It is the

responsibility of software to convert the relative temperature to an absolute

temperature. The temperature returned by the DTS will always be at or below TJ,max.

Over temperature conditions are detectable via an Out Of Spec status bit. This bit is

also part of the digital thermal sensor MSR. When this bit is set, the processor is

operating out of specification and immediate shutdown of the system should occur. The

processor operation and code execution is not guaranteed once the activation of the

Out of Spec status bit is set.

The DTS relative temperature readout corresponds to the Intel Thermal Monitor (TM1/

TM2) trigger point. When the DTS indicates maximum processor core temperature has

been reached the TM1 or TM2 hardware thermal control mechanism will activate. The

DTS and TM1/TM2 temperature may not correspond to the thermal diode reading since

the thermal diode is located in a separate portion of the die and thermal gradient

between the individual core DTS. Additionally, the thermal gradient from DTS to

thermal diode can vary substantially due to changes in processor power, mechanical

T2500 Datasheet(PDF) 89 Page - Intel Corporation

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