Intel Celeron Processor in the 478-Pin Package at 1.80 GHz Datasheet

88 Datasheet

Intel

Celeron

Processor in the 478-Pin Package

If automatic mode is disabled the processor will be operating out of specification and cannot be

guaranteed to provide reliable results. Regardless of enabling of the automatic or On-Demand

modes, in the event of a catastrophic cooling failure, the processor will automatically shut down

when the silicon has reached a temperature of approximately 135 °C. At this point the system bus

signal THERMTRIP# will go active and stay active until RESET# has been initiated.

THERMTRIP# activation is independent of processor activity and does not generate any bus

cycles. If THERMTRIP# is asserted, processor core voltage (V

CC) must be removed within the

timeframe defined in Table 16.

7.3.1 Thermal Diode

The Celeron

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 Celeron

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

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