Thermal/Mechanical Design Guide
27
Sensor Based Thermal Specification Design Guidance
5
Sensor Based Thermal
Specification Design Guidance
The introduction of the sensor based thermal specification presents opportunities for
the system designer to optimize the acoustics and simplify thermal validation. The
sensor based specification utilizes the Digital Thermal Sensor information accessed
using the PECI interface.
This chapter will review thermal solution design options, fan speed control design
guidance & implementation options and suggestions on validation both with the TTV
and the live die in a shipping system.
5.1
Sensor Based Specification Overview
Create a thermal specification that meets the following requirements:
• Use Digital Thermal Sensor (DTS) for real-time thermal specification compliance.
• Single point of reference for thermal specification compliance over all operating
conditions.
• Does not required measuring processor power & case temperature during
functional system thermal validation.
• Opportunity for acoustic benefits for DTS values between T
CONTROL
and -1.
The current specification based on the processor case temperature has some notable
gaps to optimal acoustic design. When the ambient temperature is less than the
maximum design point, the fan speed control system (FSC) will over cool the processor.
The FSC has no feedback mechanism to detect this over cooling. This is shown in the
top half of
Figure 5-1
.
The sensor based specification will allow the FSC to be operated at the maximum
allowable silicon temperature or T
J
for the measured ambient. This will provide optimal
acoustics for operation above T
CONTROL
. See lower half of
Figure 5-1
.
Summary of Contents for BX80616I3540
Page 10: ...Introduction 10 Thermal Mechanical Design Guide...
Page 38: ...Sensor Based Thermal Specification Design Guidance 38 Thermal Mechanical Design Guide...
Page 50: ...Component Suppliers 50 Thermal Mechanical Design Guide...
Page 64: ...Mechanical Drawings 64 Thermal Mechanical Design Guide...
Page 70: ...Socket Mechanical Drawings 70 Thermal Mechanical Design Guide...
