AMD AX1800DMT3C - Athlon XP 1.53 GHz Processor Datasheet page 52

AMD Athlon™ XP Processor Model 6 Data Sheet
40
Preliminary Information
Thermal Protection Characterization. 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
Thermal Diode Monitoring Circuits, order# 25658
AMD Thermal, Mechanical, and Chassis Cooling Design Guide,
order# 23794
http://www1.amd.com/products/athlon/thermals
Table 15 on page 41 shows the T
specifications for circuitry in motherboard design necessary for
thermal protection of the processor.
Electrical Data
S HU TD OW N
is the maximum time
SD_DELAY
and T
SHUTDOWN
24309E—March 2002
is the
can
SD_DELAY
SD_DELAY
Chapter 7