And Diode Correction Toffset; Thermal Diode Offset; Intel Thermal Monitor - Intel Pga478 - P4-2ghz 512kb 400mhz Fsb Datasheet

Intel celeron processor 1.66 ghz/1.83 ghz

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Table Of Contents

Table of Contents

5.1.2

Thermal Diode Offset

In order to improve the accuracy of diode based temperature measurements, a

temperature offset value (specified as T

Processor 1.66 GHz/1.83 GHz Model Specific Register (MSR) which contains thermal

diode characterization data. During manufacturing, the processor thermal diode is

evaluated for its behavior relative to a theoretical diode. Using the equation above, the

temperature error created by the difference between n

particular processor is calculated.

If the n

trim

temperature sensing device, the T

can be adjusted by calculating n

as defined in the temperature sensor manufacturers' datasheet.

trim

The n

trim

Table 19.

Thermal "Diode" n

Symbol

trim

5.1.3

Intel

The Intel Thermal Monitor helps control the processor temperature by activating the

TCC (Thermal Control Circuit) when the processor silicon reaches its maximum junction

temperature. The temperature at which the Intel Thermal Monitor activates the TCC is

not user configurable. Bus traffic is snooped in the normal manner, and interrupt

requests are latched (and serviced during the time that the clocks are on) while the

TCC is active.

A thermal solution that is significantly under designed may not be capable of cooling

the processor even when the TCC is active continuously.

The Intel Thermal Monitor controls the processor temperature by modulating (starting

and stopping) the processor core clocks when the processor silicon reaches its

maximum operating temperature. The Intel Thermal Monitor uses two modes to

activate the TCC: Automatic mode and on-demand mode. If both modes are activated,

Automatic mode takes precedence.

Note:

The Intel thermal monitor automatic mode must be enabled through BIOS for the

processor to be operating within specifications.

There are two automatic modes called Intel Thermal Monitor 1 (TM1) and Intel Thermal

Monitor 2 (TM2). After Automatic mode is enabled, the TCC activates only when the

internal die temperature reaches the maximum allowed value for operation.

TM1 and TM2 can co-exist within the processor. If both TM1 and TM2 bits are enabled in

the auto-throttle MSR, TM2 takes precedence over TM1. However, if TM2 is not

sufficient to cool the processor below the maximum operating temperature, then TM1

also activates to help cool down the processor.

Note:

Intel recommends both Thermal Monitor 1 (TM1) and Thermal Monitor 2 (TM2) be

always enabled on Intel

Intel

Celeron

Processor 1.66 GHz/1.83 GHz

Intel

Celeron

Processor 1.66 GHz/1.83 GHz—Thermal Specifications and Design

value used to calculate T

actual

used to calculate the Diode Correction Toffset are listed in