Intel® 700 Series Chipset Family On-Package Platform Controller Hub (PCH)

Datasheet, Volume 1 of 2
Supporting Raptor Lake - PX Platforms

ID Date Version Classification
765585 01/30/2023 001 Public
Document Table of Contents

Thermal Trip Signal (PCHHOT#)

The PCH provides PCHHOT# signal to indicate that it has exceeded some temperature limit. The limit is set by BIOS. The temperature limit (programmed into the PHLC register) is compared to the present temperature. If the present temperature is greater than the PHLC value then the pin is asserted.

PCHHOT# is an O/D output and requires a Pull-up on the motherboard.

The PCH evaluates the temperature from the thermal sensor against the programmed temperature limit every 1 second.