Intel 500 - DATASHEET REV 003, Техническое описание

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Datasheet 63
Thermal Specifications
If the n
trim
value used to calculate the Toffset differs from the n
trim
value used to in a
temperature sensing device, the T
error(nf)
may not be accurate. If desired, the Toffset
can be adjusted by calculating n
actual
and then recalculating the offset using the n
trim
as
defined in the temperature sensor manufacturer’s datasheet.
The n
trim
used to calculate the Diode Correction Toffset are listed in Table 17 .
NOTES:
1.
Intel does not support or recommend operation of the thermal diode under reverse bias.
Intel does not support or recommend operation of the thermal diode when the processor
power supplies are not within their specified tolerance range.
2. Characterized across a temperature range of 50-100°C.
3. Not 100% tested. Specified by design characterization.
4. The ideality factor, n, represents the deviation from ideal diode behavior as exemplified by
the diode equation:
I
FW
=I
s
*(e
(qV
D
/nkT)
-1), where I
S
= saturation current, q = electronic charge, V
D
= voltage
across the diode, k = Boltzmann Constant, and T = absolute temperature (Kelvin).
5. The series resistance, R
T
, is provided to allow for a more accurate measurement of the
diode junction temperature. R
T
as defined includes the pins of the processor but does not
include any socket resistance or board trace resistance between the socket and the
external remote diode thermal sensor. R
T
can be used by remote diode thermal sensors
with automatic series resistance cancellation to calibrate out this error term. Another
application is that a temperature offset can be manually calculated and programmed into
an offset register in the remote diode thermal sensors as exemplified by the equation:
T
error
= [R
T
*(N-1)*I
FWmin
]/[(no/q)*ln N]
where T
error
= sensor temperature error, N = sensor current ratio, k = Boltzmann
Constant, and q = electronic charge.
Table 17. Thermal Diode n
trim
and Diode Correction Toffset
Symbol Parameter Value
n
trim
Diode Ideality used to calculate Toffset 1.01
Table 18. Thermal Diode Interface
Signal Name Pin/Ball Number Signal Description
THERMDA A24 Thermal diode anode
THERMDC A25 Thermal diode cathode
Table 19. Thermal Diode Parameters using Diode Mode
Symbol Parameter Min Typ Max Unit Notes
I
FW
Forward Bias Current 5 200 µA 1
n Diode Ideality Factor 1.000 1.009 1.050 2, 3, 4
R
T
Series Resistance 2.79 4.52 6.24 Ω 2, 3, 5