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Thermal Specifications
If the n
trim
temperature sensing device, the T
can be adjusted by calculating n
defined in the temperature sensor manufacturer's datasheet.
The n
trim
Table 17.
Thermal Diode n
Symbol
n
trim
Table 18.
Thermal Diode Interface
Signal Name
THERMDA
THERMDC
Table 19.
Thermal Diode Parameters using Diode Mode
Symbol
I
FW
n
R
T
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
across the diode, k = Boltzmann Constant, and T = absolute temperature (Kelvin).
5.
The series resistance, R
diode junction temperature. R
include any socket resistance or board trace resistance between the socket and the
external remote diode thermal sensor. R
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
where T
Constant, and q = electronic charge.
Datasheet
value used to calculate the Toffset differs from the n
actual
used to calculate the Diode Correction Toffset are listed in
and Diode Correction Toffset
trim
Parameter
Diode Ideality used to calculate Toffset
Pin/Ball Number
A24
A25
Parameter
Forward Bias Current
Diode Ideality Factor
Series Resistance
(qV
/nkT)
D
=I
*(e
-1), where I
s
, is provided to allow for a more accurate measurement of the
T
= [R
*(N-1)*I
]/[(no/q)*ln N]
T
FWmin
= sensor temperature error, N = sensor current ratio, k = Boltzmann
error
may not be accurate. If desired, the Toffset
error(nf)
and then recalculating the offset using the n
Signal Description
Thermal diode anode
Thermal diode cathode
Min
Typ
5
1.000
1.009
2.79
4.52
= saturation current, q = electronic charge, V
S
as defined includes the pins of the processor but does not
T
can be used by remote diode thermal sensors
T
value used to in a
trim
trim
Table
17.
Value
1.01
Max
Unit
Notes
200
µA
1
1.050
2, 3, 4
6.24
Ω
2, 3, 5
= voltage
D
as
63
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