Intel T1700 LF80537NF0341MN Data Sheet

Datasheet

91

When PROCHOT# is driven by an external agent, if only Intel Thermal Monitor 1 is 

enabled on both cores, then both processor cores will have their core clocks modulated. 

If Intel Thermal Monitor 2 is enabled on both cores, then both processor cores will 

enter the lowest programmed Intel Thermal Monitor 2 performance state. It should be 

noted that Force Intel Thermal Monitor 1 on Intel Thermal Monitor 2, enabled via BIOS, 

does not have any effect on external PROCHOT#. If PROCHOT# is driven by an external 

agent when Intel Thermal Monitor 1, Intel Thermal Monitor 2, and Force Intel Thermal 

Monitor 1 on Intel Thermal Monitor 2 are all enabled, then the processor will still apply 

only Intel Thermal Monitor 2.

PROCHOT# may be used for thermal protection of voltage regulators (VR). System 

designers can create a circuit to monitor the VR temperature and activate the TCC 

when the temperature limit of the VR is reached. By asserting PROCHOT# (pulled-low) 

and activating the TCC, the VR will cool down as a result of reduced processor power 

consumption. Bi-directional PROCHOT# can allow VR thermal designs to target 

maximum sustained current instead of maximum current. Systems should still provide 

proper cooling for the VR and rely on bi-directional PROCHOT# only as a backup in case 

of system cooling failure. The system thermal design should allow the power delivery 

circuitry to operate within its temperature specification even while the processor is 

operating at its TDP. With a properly designed and characterized thermal solution, it is 

anticipated that bi-directional PROCHOT# would only be asserted for very short periods 

of time when running the most power intensive applications. An under-designed 

thermal solution that is not able to prevent excessive assertion of PROCHOT# in the 

anticipated ambient environment may cause a noticeable performance loss.

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