Intel Z520PT CH80566EE014DT Ficha De Dados
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Códigos do produto
CH80566EE014DT
Thermal Specifications and Design Considerations
Datasheet
69
Table 18. Thermal Diode Interface
Signal Name
Pin/Ball Number
Signal Description
THERMDA
T5
Thermal diode anode
THERMDC
U4
Thermal diode cathode
Table 19. Thermal Diode Parameters Using Transistor Model
Symbol
Parameter
Min.
Typ.
Max.
Unit
Note
s
IFW
Forward Bias Current
5
—
200
µ
A
1
IE
Emitter Current
5
—
200
µ
A
1
nQ
Transistor Ideality
0.997 1.001 1.015
2, 3, 4
Beta
0.25
—
0.65
2, 3
R
T
Series Resistance
2.79
4.52
6.24
Ω
2, 5
NOTES:
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:
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 (Table 19) can be used for
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 equation listed under Table 19. 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
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:
T
error(nf)
= Tmeasured * (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.