Mobile Intel Pentium 4 Processor Supporting Hyper-Threading Technology on 90-nm Process Technology

Mobile Intel® Pentium® 4 Processor Supporting Hyper-Threading Technology on 90-nm Process Technology Datasheet 65
Thermal Specifications and Design Considerations
5. The series resistance, R
T
, is provided to allow for a more accurate measurement of the diode 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. 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:
T
error
= [R
T
* (N-1) * I
FWmin
] / [nk/q * ln N]
where T
error
= sensor temperature error, N = sensor current ratio, k = Boltzmann Constant, q = electronic
charge.
§
Table 5-3. Thermal Diode Interface
Pin Name Pin Number Pin Description
THERMDA B3 diode anode
THERMDC C4 diode cathode