AMD 8 manual AMD Athlon Processor-Based Motherboard Design Guide, order#, Preliminary Information

Preliminary Information

25175H —March 2003 AMD Athlon™ XP Processor Model 8 Data Sheet

Thermal Protection The following section describes parameters relating to thermal

Characterization 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. TSHUTDOWN is the temperature for thermal protection circuitry to initiate

shutdown of the processor. TSD_DELAY is the maximum time 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 TSD_DELAY can 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 TSHUTDOWN and TSD_DELAY specifications for circuitry in motherboard design necessary for

thermal protection of the processor.

Chapter 8 Electrical Data 43