Platform Environmental Control Interface (Peci) - Intel BX80570E8200 - Core 2 Duo 2.66 GHz Processor Design Manual

Thermal Management Logic and Thermal Monitor Feature
The processor uses the Digital Thermal Sensor (DTS) as the on-die sensor to use for
fan speed control (FSC). 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 as below:
 If the Digital thermal sensor reading is less than T
reduced.
 If the Digital thermal sensor reading is greater than or equal to T
must be maintained at or below the Thermal Profile for the measured power
dissipation.
The DTS T
can read the T
Figure 4-3. T
CONTROL
Note: The processor has only DTS and no 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
value is factory configured and is written into T
CONTROL
MSR and provide this value to the fan speed control device.
OFFSET
for Digital Thermal Sensor
the fan speed can be
CONTROL,
CONTROL,
MSR, the BIOS
OFFSET
in the MSR is relevant
CONTROL
®
Quiet System Technology (Intel
with
CONTROL
then T
C
®
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