Lenovo 59P5107 Datenblatt PDF herunterladen (Seite 97)

Low Voltage Intel

Xeon

™

Processor at 1.60 GHz, 2.0 GHz and 2.4 GHz

Datasheet 97

7.4 Thermal Diode

The Low Voltage Intel Xeon processor incorporates an on-die thermal diode. A thermal sensor

located on the baseboard may monitor the die temperature of the processor for thermal

management/long term die temperature change purposes. Table 39 and Table 40 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 39. Thermal Diode Parameters

Symbol Parameter Min Typ Max Unit Notes

Forward Bias

Current

5300µA1

Diode Ideality

Factor

1.0011 1.0021 1.0030 2, 3, 4

Series

Resistance

3.64 W 2, 3, 5

NOTES:

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

2. Characterized at 75

°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:

*(e

(qVD/nkT)

-1)

Where I

= saturation current, q = electronic charge, V

= voltage across the diode, k = Boltzmann

Constant, and T = absolute temperature (Kelvin).

5. The series resistance, R

, is provided to allow for a more accurate measurement of the diode junction

temperature. R

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. R

may 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 may be manually calculated and programmed

i n t o a n o f f s e t r e g i s t e r i n t h e r e m o t e d i o d e t h e r m a l s e n s o r s a s e x e m pl i f i e d b y t h e e q u at i o n :

error

= [R

*(N-1)*I

FWmin

]/[(nk/q)*ln N]

Where T

error

= sensor temperature error, N = sensor current ration, k = Boltzmann Constant, q = electronic

charge.

Table 40. Thermal Diode Interface

Pin Name Pin Number Pin Description

THERMDA Y27 diode anode

THERMDC Y28 diode cathode

1 2 ... 92 93 94 95 96 97 98 99 100 101 102

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