參數(shù)資料
型號: SDC2200DUT3D
廠商: ADVANCED MICRO DEVICES INC
元件分類: 微控制器/微處理器
英文描述: 1500 MHz, MICROPROCESSOR, CPGA453
封裝: OPGA-453
文件頁數(shù): 95/102頁
文件大?。?/td> 3049K
代理商: SDC2200DUT3D
80
Appendix A - Thermal Diode Calculations
AMD Sempron Processor Model 10 with 256K L2 Cache Data Sheet
31994A—1August 2004
Equation (1) shows the ideal diode calculation.
Sourcing two currents and using Equation (1) derives the
difference in the base-to-emitter voltage that leads to finding
the diode temperature as shown in Equation (2). The use of
dual sourcing currents allows the measurement of the thermal
diode temperature to be more accurate and less susceptible to
die and process revisions. Temperature sensors that utilize
series resistance cancellation can use more than two sourcing
currents and are suitable to be used with the AMD thermal
diode. Equation (2) is the formula for calculating the
temperature of a thermal diode.
Temperature Offset Correction
A temperature offset may be required to correct the value
measured by a temperature sensor. An offset is necessary if a
difference exists between the lumped ideality factor of the
processor and the ideality factor assumed by the temperature
sensor. The lumped ideality factor can be calculated using the
equations in this section to find the temperature offset that
should be used with the temperature sensor.
Table 25 shows the constants and variables used to calculate the
temperature offset correction.
(1)
V
BE
n
f lumped
,
k
q
--- T
I
C
I
S
----
ln
=
(2)
T
V
BE high
,
V
BE low
,
n
f lumped
,
k
q
---
I
high
I
low
--------
ln
---------------------------------------------------------------
=
Table 25. Constants and Variables Used in Temperature Offset Equations
Equation Symbol
Variable, Constant Description
nf, actual
Actual ideality factor
nf, lumped
Lumped ideality factor
nf, TS
Ideality factor assumed by temperature sensor
Ihigh
High sourcing current
Ilow
Low sourcing current
Tdie, spec
Die temperature specification
Toffset
Temperature offset
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