Intel Pentium 4 Processor in the 478-PinPackage at 1.40 GHz, 1.50 GHz, 1.60 GHz, 1.70 GHz, 1.80 GHz, 1.90 GHz, and 2GHz

Features
86 Datasheet
7.3.1 Thermal Diode
The Pentium 4 processor in the 478-pin package incorporates an on-die thermal diode. A
thermal sensor located on the system board may monitor the die temperature of the
Pentium 4 processor in the 478-pin package for thermal management/long term die
temperature change purposes. Table 35 and Table 36 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. Not 100% tested. Specified by design characterization.
2. Intel does not support or recommend operation of the thermal diode under reverse bias.
3. At room temperature with a forward bias of 630 mV.
4. n_ideality is the diode ideality factor parameter, as represented by the diode equation:
I=Io(e (Vd*q)/(nkT) - 1).
Table 35. Thermal Diode Parameters
Symbol Min Typ Max Unit Notes
1
I
forward bias
5 450 uA 2
n_ideality 0.9933 1.0045 1.0368 3, 4
Table 36. Thermal Diode Interface
Pin Name Pin Number Pin Description
THERMDA B3 diode anode
THERMDC C4 diode cathode