360J datasheet(66/68 Pages) INTEL

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Thermal Specifications and Design Considerations

Datasheet

Offset between the thermal diode based temperature reading and the Intel Thermal

Monitor reading may be characterized using the Intel Thermal Monitor’s Automatic

mode activation of thermal control circuit. This temperature offset must be taken into

account when using the processor thermal diode to implement power management

events.

5.1.2

Thermal Diode Offset

A temperature offset value (specified as Toffset in Table 19) will be programmed into a

Celeron M processor Model Specific Register (MSR). This offset is determined by using a

thermal diode ideality factor mean value of n = 1.0022 (shown in Table 19) as a

reference. This offset must be applied to the junction temperature read by the thermal

diode. Any temperature adjustments due to differences between the reference ideality

value of 1.0022 and the default ideality values programmed into the on-board thermal

sensors, will have to be made before the above offset is applied.

NOTES:

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

Intel does not support or recommend operation of the thermal diode when the processor

power supplies are not within their specified tolerance range.

Characterized at 100°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(qVD/nkT) -1)

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

Boltzmann Constant, and T = absolute temperature (Kelvin).

Value shown in the table is not the Celeron M processor thermal diode ideality factor. It is a

reference value used to calculate the Celeron M thermal diode temperature offset.

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

diode junction 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 manually calculated and programmed into

an offset register in the remote diode thermal sensors as exemplified by the equation:

Terror = [RT*(N-1)*IFWmin]/[(no/q)*ln N]

Offset value is programmed in processor Model Specific Register.

Table 18.

Thermal Diode Interface

Signal Name

Pin/Ball Number

Signal Description

THERMDA

B18

Thermal diode anode

THERMDC

A18

Thermal diode cathode

Table 19.

Thermal Diode Specification

Symbol

Parameter

Min

Typ

Max

Unit

Notes

IFW

Forward Bias Current

300

µA

Note 1

Toffset

Thermal Diode Temperature

Offset

-4

°C

2, 6

Reference Diode Ideality Factor

Used to Calculate Temperature

Offset

1.0022

Notes 2,

3, 4

Series Resistance

3.06

2, 3, 5

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