5000 datasheet(80/104 Pages) INTEL

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Thermal Specifications

Dual-Core Intel® Xeon® Processor 5000 Series Datasheet

between ntrim and the actual ideality of the particular processor will be calculated. This

value (Tdiode_Offset) will be programmed into the new diode correction MSR and then

added to the Tdiode_Base value can be used to correct temperatures read by diode

based temperature sensing devices.

If the ntrim value used to calculating Tdiode_Offset differs from the ntrim value used in a

temperature sensing device, the Terror(nf) may not be accurate. If desired, the

Tdiode_Offset can be adjusted by calculating nactual and then recalculating the offset

using the actual ntrim as defined in the temperature sensor manufacturers’ datasheet.

The parameters used to calculate the Thermal Diode (Tdiode) Correction Factor are

listed in Table 6-12. For Dual-Core Intel Xeon Processor 5000 series, the range of

Tdiode Correction Factor is ±14°C.

Notes:

Intel does not support or recommend operation of the thermal diode under reverse bias.

Characterized across a temperature range of 50-80°C.

Not 100% tested. Specified by design characterization.

The ideality factor, n, represents the deviation from ideal diode behavior as exemplified by the diode

equation: IFW = IS * (eqVD/nkT - 1)

Where IS = saturation current, q = electronic charge, VD = voltage across the diode, k = Boltzmann

Constant, and T = absolute temperature (Kelvin).

The series resistance, RT, is provided to allow for a more accurate measurement of the junction

temperature. RT, as defined, includes the lands of the processor but does not include any socket resistance

or board trace resistance between the socket and external remote diode thermal sensor. RT can be used by

remote diode thermal sensors with automatic series resistance cancellation to calibrate out this error term.

Another application is that a temperature offset can be manually calculated and programmed into an offset

Terror = [RT * (N-1) * IFWmin] / [nk/q *ln N]

Where Terror=sensor temperature error, N=sensor current ratio, k=Boltzmann Constant, q=electronic

charge.

Table 6-9.

Thermal Diode Parameters using Diode Model

Symbol

Parameter

Min

Typ

Max

Unit

Notes

IFW

Forward Bias Current

200

µA

Diode Ideality Factor

1.000

1.009

1.050

2, 3, 4

Series Resistance

2.79

4.52

6.24

2, 3, 5

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