Intel i7-660LM CN80617004857AA User Manual

64

Datasheet

This trip point is set at the temperature at which the integrated graphics and memory 

controller must start throttling. It may optionally enable integrated graphics and 

memory controller throttling when the temperature is exceeded. This trip point may 

provide an interrupt to ACPI (or other software) when it is crossed in either direction. 

Software could optionally set this as an interrupt when the temperature exceeds this 

level setting.

This trip point is set at the temperature at which the integrated graphics and memory 

controller must be shut down immediately without any software support. This trip point 

may be programmed to generate an interrupt, enable throttling, or immediately shut 

down the system (via Halt or via THERMTRIP# assertion). Crossing a trip point in either 

direction may generate several types of interrupts.

See the integrated graphics and memory controller BIOS Specification for 

recommended Trip Point programming. Aux Trip Points (0, 1, 2, 3) should be 

programmed for software and firmware control via interrupts. HOT Trip Point should be 

set to throttle integrated graphics and memory controller to avoid T

j,max

 of 100°C. 

Catastrophic Trip Point should be set to halt operation to avoid maximum Tj of 130°C.

Crossing a trip point in either direction may generate several types of interrupts. Each 

trip point has a register that can be programmed to select the type of interrupt to be 

generated. Crossing a trip point is implemented as edge detection on each trip point to 

generate the interrupts. Either edge (i.e., crossing the trip point in either direction) 

generates the interrupt.

The error associated with DTS measurement will not exceed ±5°C within the operating 

range. Integrated graphics and memory controller may not operate above T

j,max

 spec. 

This value is based on product characterization and is not guaranteed by manufacturing 

test.

Software has the ability to program the T

cat

, T

hot

, and T

aux

 trip points, but these trip 

points should be selected with consideration for the thermal sensor accuracy and the 

quality of the platform thermal solution. Overly conservative (unnecessarily low) 

temperature settings may unnecessarily degrade performance due to frequent 

throttling, while overly aggressive (dangerously high) temperature settings may fail to 

protect the part against permanent thermal damage.

Hysteresis provides a small amount of positive feedback to the thermal sensor circuit to 

prevent a trip point from flipping back and forth rapidly when the temperature is right 

at the trip point. The digital hysteresis offset is programmable via processor registers.