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313079-001 Datasheet(PDF) 80 Page - Intel Corporation |
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313079-001 Datasheet(HTML) 80 Page - Intel Corporation |
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80 / 104 page  Thermal Specifications 80 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: 1. Intel does not support or recommend operation of the thermal diode under reverse bias. 2. Characterized across a temperature range of 50-80°C. 3. Not 100% tested. Specified by design characterization. 4. 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). 5. 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 register in the remote diode thermal sensors as exemplified by the equation: 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 5 - 200 µA 1 n Diode Ideality Factor 1.000 1.009 1.050 - 2, 3, 4 RT Series Resistance 2.79 4.52 6.24 Ω 2, 3, 5 |
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