LED`s-Lichterkette...Wie?!?

[Mobiletester]

Seite 85 von folgenden Dokument:
http://www.intel.com/design/pentium4...hts/298643.htm


6.3.1 Thermal Diode
The Pentium 4 processor with 512-KB L2 cache on 0.13 micron process incorporates an
on-die thermal diode. A thermal sensor located on the system board may monitor the die
temperature of the processor for thermal management/long term die temperature change
purposes. Table 24 and Table 25 provide the diode parameter and interface specifications.
This thermal diode is separate from the Thermal Monitor’s thermal sensor and cannot be
used to predict the behavior of the Thermal Monitor.
NOTES:
1. Intel does not support or recommend operation of the thermal diode under reverse bias.
2. Characterized at 75C.
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:
IFW=Is *(e(qVD/nkT) -1)
Where IS = saturation current, q = electronic charge, VD = voltage across the diode, k = Boltzmann Constant,
and T = absolute temperature (Kelvin).
5. The series resistance, RT, is provided to allow for a more accurate measurement of the diode junction
temperature. RT 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. 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:
Terror = [RT*(N-1)*IFWmin]/[(nk/q)*ln N]
Where Terror = sensor temperature error, N = sensor current ration, k = Boltzmann Constant, q = electronic
charge.
Table 24. Thermal Diode Parameters
Symbol Parameter Min Typ Max Unit Notes1
IFW
Forward Bias
Current 5 300 uA 1
n Diode Ideality
Factor 1.0011 1.0021 1.0030 2,3,4
RT Series Resistance 3.64 2,3,4
Table 25. Thermal Diode Interface
Pin Name Pin Number Pin Description
THERMDA B3 diode anode
THERMDC C4 diode cathode

Hat zwar nichts mehr mit dem ursprünglichen Thema zu tun, was solls...