Intel E6700 Mechanical Design Guidelines - Page 37
Digital Thermal Sensor
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Thermal Management Logic and Thermal Monitor Feature 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 TCONTROL value will be provided for use with DTS. The usage model for TCONTROL 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 TCONTROL value is factory configured and is written into TOFFSET MSR. The BIOS can read the TOFFSET MSR and provide this value to the fan speed control device. Figure 4-3. TCONTROL for Digital Thermal Sensor Note: The processor has only DTS and no thermal diode. The TCONTROL in the MSR is relevant only to the DTS. Thermal and Mechanical Design Guidelines 37