Intel 2 Duo U7500 LE80537UE0042ML User Manual
Product codes
LE80537UE0042ML
Thermal Specifications and Design Considerations
86
Datasheet
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
NOTES:
1.
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.
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
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
TT
, is provided to allow for a more accurate measurement of the
diode junction temperature. R
TT
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
external remote diode thermal sensor. R
TT
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
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
TT
*(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 20.
Thermal Diode n
trim
and Diode Correction Toffset
Symbol
Parameter
Unit
n
trim
Diode Ideality used to calculate Toffset
1.01
Table 21.
Thermal Diode Interface
Signal Name
Pin/Ball Number
Signal Description
THERMDA
A24
Thermal diode anode
THERMDC
A25
Thermal diode cathode
Table 22.
Thermal Diode Parameters using Diode Mode
Symbol
Parameter
Min
Typ
Max
Unit
Notes
I
FW
Forward Bias Current
5
N/A
200
µA
1
n
Diode Ideality Factor
1.000
1.009
1.050
N/A
2, 3, 4
R
TT
Series Resistance
2.79
4.52
6.24
Ω
2, 3, 5