Intel Celeron 360 HH80552RE099512 用户手册
产品代码
HH80552RE099512
Datasheet
83
Thermal Specifications and Design Considerations
When calculating a temperature based on thermal diode measurements, a number of
parameters must be either measured or assumed. Most devices measure the diode
ideality and assume a series resistance and ideality trim value, although some are
capable of also measuring the series resistance. Calculating the temperature is then
accomplished using the equations listed under
. In most temperature sensing
devices, an expected value for the diode ideality is designed-in to the temperature
calculation equation. If the designer of the temperature sensing device assumes a
perfect diode the ideality value (also called n
trim
) will be 1.000. Given that most diodes
are not perfect, the designers usually select a n
trim
value that more closely matches the
behavior of the diodes in the processor. If the processors diode ideality deviates from
that of n
trim
, each calculated temperature will be offset by a fixed amount. This
temperature offset can be calculated with the equation:
T
error(nf)
= T
measured
X (1 – n
actual
/n
trim
)
Where T
error(nf)
is the offset in degrees C, T
measured
is in Kelvin, n
actual
is the measured
ideality of the diode, and n
trim
is the diode ideality assumed by the temperature
sensing device.
To improve the accuracy of diode based temperature measurements, a new register
To improve the accuracy of diode based temperature measurements, a new register
containing Thermal Diode Offset data has been added to the Celeron D processor.
During manufacturing, each processors thermal diode will be evaluated for its behavior
relative to a theoretical diode. Using the equation above, the temperature error created
by the difference between n
trim
and the actual ideality of the particular processor will
be calculated. This Thermal Diode Offset value will be programmed in to the new diode
correction MSR and when added to the Thermal Diode Base value can be used to
correct temperatures read by diode based temperature sensing devices.
If the n
If the n
trim
value used to calculate the Thermal Diode Offset differs from the n
trim
value
used in a temperature sensing device, the T
error(nf)
may not be accurate. If desired, the
Thermal Diode Offset can be adjusted by calculating n
actual
and then recalculating the
offset using the actual n
trim
as defined in the temperature sensor manufacturers'
datasheet.
The Diode_Base value and n
The Diode_Base value and n
trim
used to calculate the Diode_Correction_Offset are
listed in
.
§ §
Table 32.
Thermal “Diode” n
trim
and Diode_Correction_Offset
Symbol
Parameter
Unit
n
trim
Diode ideality used to calculate Diode_Offset
1.008
Diode_Base
Diode Base
0
C
Table 33.
Thermal Diode Interface
Signal Name
Land Number
Signal Description
THERMDA
AL1
diode anode
THERMDC
AK1
diode cathode