Datasheet

Datasheet 53

Thermal Specifications and Design Considerations

4.1.1 Thermal Diode

The Pentium III processor incorporates an on-die diode that may be used to monitor the die

temperature (junction temperature). A thermal sensor located on the baseboard, or a stand-alone

measurement kit, may monitor the die temperature of the Pentium III processor for thermal

management or instrumentation purposes. Table 27 and Table 28 provide the diode parameter and

interface specifications.

NOTES:

1. Intel does not support or recommend operation of the thermal diode under reverse bias.

2. At room temperature with a forward bias of 630 mV.

3. n_ideality is the diode ideality factor parameter, as represented by the diode equation:

I=Io(e (Vd*q)/(nkT) – 1).

4. This specification applies to the Pentium III processor with CPUID=067xh.

5. This specification applies to the Pentium III processor with CPUID=068xh.

Table 27. Thermal Diode Parameters

Symbol Min Typ Max Unit Notes

forward bias

5 500 µA

n_ideality

1.0000

1.0057

1.0065

1.0080

1.0173

1.0125

2, 3, 4

2, 3, 5

Table 28. Thermal Diode Interface

Pin Name SC 242 Connector Signal # Pin Description

THERMDP B14 diode anode (p_junction)

THERMDN B15 diode cathode (n_junction)