Intel N455 AU80610006237AA Manual Do Utilizador
Códigos do produto
AU80610006237AA
Thermal Specifications and Design Considerations
66
Datasheet
provide the diode interface and specifications. Transistor
model parameters shown in
providing more accurate temperature
measurements when the diode ideality factor is closer to the maximum or minimum
limits. Contact your external sensor supplier for their recommendation. The thermal
diode is separate from the Thermal Monitor’s thermal sensor and cannot be used to
predict the behavior of the Thermal Monitor.
limits. Contact your external sensor supplier for their recommendation. The thermal
diode is separate from the Thermal Monitor’s thermal sensor and cannot be used to
predict the behavior of the Thermal Monitor.
NOTES:
1.
1.
Intel does not support or recommend operation of the thermal diode under reverse bias.
2.
Characterized across a temperature range of 50–100°C.
3.
Not 100% tested. Specified by design characterization.
4.
The ideality factor, nQ, represents the deviation from ideal transistor model behavior as
exemplified by the equation for the collector current:
exemplified by the equation for the collector current:
I
C
= I
S
* (e
qV
BE
/n
Q
kT
–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).
5.
The series resistance, R
T
, provided in the Diode Model Table (
more accurate readings as needed.
When calculating a temperature based on the 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 are capable of
also measuring the series resistance. Calculating the temperature is then accomplished
using the equations listed under
of parameters must be either measured or assumed. Most devices measure the diode
ideality and assume a series resistance and ideality trim value, although are capable of
also measuring the series resistance. Calculating the temperature is then accomplished
using the equations listed under
. In most 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
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 an n
trim
value that more closely matches the behavior of the
diodes in the processor. If the processor diode ideality deviates from that of the n
trim
,
each calculated temperature will be offset by a fixed amount. This temperature offset
can be calculated with the equation:
can be calculated with the equation:
Table 6-44.Thermal Diode Interface
Signal Name
Pin/Ball Number
Signal Description
THRMDA_1
D30
Thermal diode anode
THRMDC_1
E30
Thermal diode cathode
Table 6-45.Thermal Diode Parameters using Transistor Model
Symbol
Parameter
Min
Typ
Max
Unit
Notes
IFW
Forward Bias Current
5
200
μA
1
IE
Emitter Current
5
200
μA
1
nQ
Transistor Ideality
0.997
1.001
1.015
2,3,4
Beta
0.25
0.65
2,3
RT
Series Resistance
2.79
4.52
6.24
Ω
2,5