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Thermal Management Logic and Thermal Monitor Feature
The processor introduces the Digital Thermal Sensor (DTS) as the on-die sensor to use
for fan speed control (FSC). The DTS will eventually replace the on-die thermal diode
used in pervious products. The processor will have both the DTS and thermal diode
enabled. The DTS is monitoring the same sensor that activates the TCC (see
Section 4.2.2). Readings from the DTS are relative to the activation of the TCC. The
DTS value where TCC activation occurs is 0 (zero).
A T
CONTROL
the DTS is the same as with the on-die thermal diode:
• If the Digital thermal sensor is less than T
• If the Digital thermal sensor is greater than or equal to T
maintained at or below the Thermal Profile for the measured power dissipation.
The calculation of T
value to sum with the T
The BIOS only needs to read the T
control device.
Figure 4-3. T
CONTROL
Thermal Diode Temperature
Thermal Diode Temperature
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Note: The processor has both the DTS and thermal diode. The T
only to the DTS.
4.2.11
Platform Environmental Control Interface (PECI)
The PECI interface is a proprietary single wire bus between the processor and the
chipset or other health monitoring device. At this time the digital thermal sensor is the
only data being transmitted. For an overview of the PECI interface see PECI Feature
Set Overview. For additional information on the PECI, see the datasheet.
The PECI bus is available on pin G5 of the LGA 775 socket. Intel chipsets beginning
with the ICH8 have included PECI host controller. The PECI interface and the
Manageability Engine are key elements to the Intel
Thermal and Mechanical Design Guidelines
value will be provided for use with DTS. The usage model for T
is slightly different from previous product. There is no base
CONTROL
located in the same MSR as used in previous processors.
OFFSET
for Digital Thermal Sensor
Temperature
Temperature
Temperature
Temperature
the fan speed can be reduced.
CONTROL,
MSR and provide this value to the fan speed
OFFSET
Digital Thermometer Temperature
Digital Thermometer Temperature
Power
Power
Power
Power
Fan Speed
Fan Speed
Fan Speed
Fan Speed
Time
Time
Time
Time
®
Quiet System Technology (Intel
CONTROL
then T
must be
CONTROL,
C
0
0
0
0
0
0
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in the MSR is relevant
CONTROL
with
®
39
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