Thermal Diode Parameters; Thermal Diode Interface; Datasheet - Intel SL8J6 - Pentium 4 Processor Datasheet

Thermal Specifications and Design Considerations
Table 28. Thermal Diode Parameters
Symbol
I
FW
n
R
T
NOTES:
1. Intel does not support or recommend operation of the thermal diode under reverse bias.
2. Characterized at 75 °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 equa-
tion:
where I
Constant, and T = absolute temperature (Kelvin).
5. Devices found to have an ideality factor of 1.0183 to 1.023 will create a temperature error of approximately
2 C higher than the actual temperature. In order to minimize any potential acoustic impact of this temperature
error, Tcontrol will be increased by 2 C on these parts.
6. The series resistance, R
perature. R
board trace resistance between the socket and the external remote diode thermal sensor. RT 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:
where T
charge.
Table 29. Thermal Diode Interface
70
Parameter
Forward Bias Current
Diode Ideality Factor
Series Resistance
I = I * (e
FW S
= saturation current, q = electronic charge, V
S
, is provided to allow for a more accurate measurement of the thermal diode tem-
T
, as defined, includes the pins of the processor but does not include any socket resistance or
T
T = [R
error T
= sensor temperature error, N = sensor current ratio, k = Boltzmann Constant, q = electronic
error
Pin Name
THERMDA
THERMDC
Min Typ
11
1.0083 1.011
3.242 3.33
qV /nkT
–1)
D
= voltage across the diode, k = Boltzmann
D
* (N-1) * I ] / [nk/q * ln N]
FWmin
Pin Number
B3
C4
§
Max Unit Notes
1
187 uA
2, 3, 4, 5
1.023
Ω
2, 3, 6
3.594
Pin Description
diode anode
diode cathode

Datasheet