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25175H—March 2003
Thermal Protection
Characterization
Chapter 8
Preliminary Information
The following section describes parameters relating to thermal
protection. The implementation of thermal control circuitry to
control processor temperature is left to the manufacturer to
determine how to implement.
Thermal limits in motherboard design are necessary to protect
the processor from thermal damage. T
temperature for thermal protection circuitry to initiate
shutdown of the processor. T
allowed from the detection of the over-temperature condition to
processor shutdown to prevent thermal damage to the
processor.
Systems that do not implement thermal protection circuitry or
that do not react within the time specified by T
cause thermal damage to the processor during the unlikely
events of fan failure or powering up the processor without a
heat-sink. The processor relies on thermal circuitry on the
motherboard to turn off the regulated core voltage to the
processor in response to a thermal shutdown event.
Thermal protection circuitry reference designs and thermal
solution guidelines are found in the following documents:
AMD Athlon™ Processor-Based Motherboard Design Guide,
order# 24363
AMD Thermal, Mechanical, and Chassis Cooling Design Guide,
order# 23794
See http://www.amd.com for more information about thermal
solutions.
Table 18 on page 44 shows the T
specifications for circuitry in motherboard design necessary for
thermal protection of the processor.
Electrical Data
AMD Athlon™ XP Processor Model 8 Data Sheet
SH UT D OWN
is the maximum time
SD_DELAY
SHUTDOWN
is the
can
SD_DELAY
and T
SD_DELAY
43
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