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25175H—March 2003 AMD Athlon™ XP Processor Model 8 Data Sheet
Preliminary Information
Appendix A - Thermal Diode Calculations 83
Preliminary Information
Appendix A
Thermal Diode Calculations
This section contains information about the calculations for the
on-die thermal diode of the AMD Athlon™ XP processor model
8. For electrical information about this thermal diode, see
Table 17, “Thermal Diode Electrical Characteristics,” on
page 42.
Ideal Diode Equation
The ideal diode equation uses the variables and constants
defined in Table 29.
Table 29. Constants and Variables for the Ideal Diode Equation
Equation Symbol Variable, Constant Description
n
f, lumped
Lumped ideality factor
k Boltzmann constant
q Electron charge constant
T Diode temperature (Kelvin)
V
BE
Voltage from base to emitter
I
C
Collector current
I
S
Saturation current