Thermal Management Logic and Thermal Monitor Feature
Thermal and Mechanical Design Guidelines 37
4.2.10 Digital Thermal Sensor
Multiple digital thermal sensors can be implemented within the package without
adding a pair of signal pins per sensor as required with the thermal diode. The digital
thermal sensor is easier to place in thermally sensitive locations of the processor than
the thermal diode. This is achieved due to a smaller foot print and decreased
sensitivity to noise. Since the DTS is factory set on a per-part basis there is no need
for the health monitor components to be updated at each processor family.
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
value will be provided for use with DTS. The usage model for T
CONTROL
with
the DTS as below:
• If the Digital thermal sensor reading is less than TCONTROL, the fan speed can be
reduced.
• If the Digital thermal sensor reading is greater than or equal to TCONTROL, then
TC must be maintained at or below the Thermal Profile for the measured power
dissipation.
The DTS T
CONTROL
value is factory configured and is written into T
OFFSET
MSR. The BIOS
can read the T
OFFSET
MSR and provide this value to the fan speed control device.
Figure 4-3. T
CONTROL
for Digital Thermal Sensor
Note: The processor has only DTS and no thermal diode. The T
CONTROL
in the MSR is relevant
only to the DTS.
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