X6800 Datasheet, PDF (91/122 Pages) Intel Corporation – Core2 Extreme Processor

Thermal Specifications and Design Considerations
Table 34.
Table 35.
Thermal “Diode” Parameters using Transistor Model
Symbol
Parameter
Min
Typ
Max
Unit Notes
I_FW
I_E
n_Q
Beta
R_T
Forward Bias Current
Emitter Current
Transistor Ideality
Series Resistance
5
5
0.997
0.391
2.79
—
—
1.001
—
4.52
200
200
1.005
0.760
6.24
µA
1, 2
µA
-
3, 4, 5
3, 4
Ω
3, 6
NOTES:
1.
Intel does not support or recommend operation of the thermal diode under reverse bias.
2.
Same as I_FW in Table 33.
3.
Characterized across a temperature range of 50–80 °C.
4.
Not 100% tested. Specified by design characterization.
5.
The ideality factor, nQ, represents the deviation from ideal transistor model behavior as
exemplified by the equation for the collector current:
I_C = I_S * (e ^qVBE/nQkT –1)
Where I_S = saturation current, q = electronic charge, V_BE = voltage across the transistor
base emitter junction (same nodes as VD), k = Boltzmann Constant, and T = absolute
temperature (Kelvin).
6.
The series resistance, R_T, provided in the Diode Model Table (Table 33) can be used for
more accurate readings as needed.
The processor does not support the diode correction offset that exists on other Intel
processors
Thermal Diode Interface
Signal Name
Land Number
THERMDA
THERMDC
AL1
AK1
Signal
Description
diode anode
diode cathode
Datasheet
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