Intel 530 LF80537NE0301M Data Sheet

88

Datasheet

If the n

trim 

value used to calculate the Toffset differs from the n

trim 

value used to in a 

temperature sensing device, the T

error(nf)

 may not be accurate. If desired, the Toffset 

can be adjusted by calculating n

actual 

and then recalculating the offset using the n

trim 

as 

defined in the temperature sensor manufacturer’s datasheet.

The n

trim 

used to calculate the Diode Correction Toffset are listed in 

The Intel Thermal Monitor helps control the processor temperature by activating the 

TCC (Thermal Control Circuit) when the processor silicon reaches its maximum 

operating temperature. The temperature at which the Intel Thermal Monitor activates 

the TCC is not user configurable. Bus traffic is snooped in the normal manner and 

interrupt requests are latched (and serviced during the time that the clocks are on) 

while the TCC is active.

With a properly designed and characterized thermal solution, it is anticipated that the 

TCC would only be activated for very short periods of time when running the most 

power intensive applications. The processor performance impact due to these brief 

periods of TCC activation is expected to be minor and hence not detectable. An under-

designed thermal solution that is not able to prevent excessive activation of the TCC in 

the anticipated ambient environment may cause a noticeable performance loss and 

may affect the long-term reliability of the processor. In addition, a thermal solution that 

is significantly under-designed may not be capable of cooling the processor even when 

the TCC is active continuously.

The Intel Thermal Monitor controls the processor temperature by modulating (starting 

and stopping) the processor core clocks when the processor silicon reaches its 

maximum operating temperature. The Intel Thermal Monitor uses two modes to 

activate the TCC: automatic mode and on-demand mode. If both modes are activated, 

automatic mode takes precedence. 

There are two automatic modes called Intel Thermal Monitor 1 and Intel Thermal 

Monitor 2. These modes are selected by writing values to the MSRs of the processor. 

After automatic mode is enabled, the TCC activates only when the internal die 

temperature reaches the maximum allowed value for operation. 

When Intel Thermal Monitor 1 is enabled and a high temperature situation exists, the 

clocks modulates by alternately turning the clocks off and on at a 50% duty cycle. 

Cycle times are processor speed dependent and decreases linearly as processor core 

frequencies increase. Once the temperature has returned to a non-critical level, 

modulation ceases and TCC goes inactive. A small amount of hysteresis has been 

included to prevent rapid active/inactive transitions of the TCC when the processor 

temperature is near the trip point. The duty cycle is factory configured and cannot be 

modified. Also, automatic mode does not require any additional hardware, software 

drivers, or interrupt handling routines. Processor performance decreases by the same 

amount as the duty cycle when the TCC is active. 

Intel Thermal Monitor 1 and Intel Thermal Monitor 2 features are collectively referred 

to as Adaptive Thermal Monitoring features. Intel recommends Intel Thermal Monitor 1 

and 2 be enabled on the processors.

n

trim

Diode Ideality used to calculate Toffset

1.01