521 datasheet(83/96 Pages) INTEL

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Datasheet

Thermal Specifications and Design Considerations

5.2.7

Thermal Diode

The processor incorporates an on-die thermal diode. A thermal sensor located on the system board

may monitor the die temperature of the processor for thermal management/long term die

temperature change purposes. Table 5-4 and Table 5-5 provide the diode parameter and interface

specifications. This thermal diode is separate from the Thermal Monitor’s thermal sensor and

cannot be used to predict the behavior of the Thermal Monitor.

Table 5-4. Thermal Diode Parameters

Symbol

Parameter

Min

Typ

Max

Unit

Notes

IFW

Forward Bias Current

187

µA

NOTES:

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

Diode Ideality Factor

1.0083

1.011

1.023

2, 3, 4, 5

Characterized at 75 °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 * (e

/nkT –1)

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

Constant, and T = absolute temperature (Kelvin).

Devices found to have an ideality factor of 1.0183 to 1.023 will create a temperature error approximately 2 C° higher than

the actual temperature. To minimize any potential acoustic impact of this temperature error, TCONTROL will be increased by

2 C° on these parts.

Series Resistance

3.242

3.33

3.594

Ω

2, 3, 6

The series resistance, RT, is provided to allow for a more accurate measurement of the thermal diode temperature. RT, as

defined, includes the pins of the processor but does not include any socket resistance or board trace resistance between

the socket and the 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 manu-

ally 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 5-5. Thermal Diode Interface

Signal Name

Land Number

Signal Description

THERMDA

AL1

diode anode

THERMDC

AK1

diode cathode

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