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AMD 10, 27493, 27488 manual Temperature Offset Correction

Models: 10 27493 27488

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Preliminary Information

AMD Athlon™ XP Processor Model 10 Data Sheet

26237C— May 2003

Equation (1) shows the ideal diode calculation.

VBE =	k	⋅ T ⋅ ln	 IC	(1)
VBE =	nf, lumped ⋅ --	⋅ T ⋅ ln	---	(1)
	q		 IS

Sourcing two currents and using Equation (1) derives the difference in the base-to-emitter voltage that leads to finding the diode temperature as shown in Equation (2). The use of dual sourcing currents allows the measurement of the thermal diode temperature to be more accurate and less susceptible to die and process revisions. Temperature sensors that utilize series resistance cancellation can use more than two sourcing currents and are suitable to be used with the AMD thermal diode. Equation (2) is the formula for calculating the temperature of a thermal diode.

TVBE, high – VBE, low

=--------------------------------------------------------------

k	⋅ ln	 Ihigh	(2)
nf, lumped ⋅ --	⋅ ln	-------
q		 Ilow 

Temperature Offset Correction

A temperature offset may be required to correct the value measured by a temperature sensor. An offset is necessary if a difference exists between the lumped ideality factor of the processor and the ideality factor assumed by the temperature sensor. The lumped ideality factor can be calculated using the equations in this section to find the temperature offset that should be used with the temperature sensor.

Table 29 shows the constants and variables used to calculate the temperature offset correction.

Table 29. Constants and Variables Used in Temperature Offset Equations

	Equation Symbol	Variable, Constant Description

	nf, actual	Actual ideality factor
	nf, lumped	Lumped ideality factor
	nf, TS	Ideality factor assumed by temperature sensor
	Ihigh	High sourcing current
	Ilow	Low sourcing current
	Tdie, spec	Die temperature specification
	Toffset	Temperature offset

82	Appendix A - Thermal Diode Calculations

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AMD 10, 27493, 27488 manual Temperature Offset Correction

Contents

Data Sheet 2002, 2003 Advanced Micro Devices, Inc. All rights reserved Table of Contents Mechanical Data Ordering Information Preliminary Information Logic Symbol Diagram List of FiguresViii List of Tables List of Tables , revised wording in the Overview Revision HistoryDate Rev MayXii Overview Delivering extreme performance for Windows XPQuantiSpeed Architecture Summary LAN Preliminary Information Signaling Technology Interface SignalsOverview AMD Athlon System Bus Signals Push-Pull PP DriversFrequency Control Front-Side Bus Autodetect Legacy Logic Symbol DiagramDiode Preliminary Information Power Management Power Management StatesWorking State Halt StatePreliminary Information Probe State Connect and Disconnect ProtocolConnect Protocol Preliminary Information Procrdy Exiting the Stop Grant State and Bus Connect Sequence Diagram Connect StateReturn internal clocks to full speed and assert Connect Pending Disconnect Disconnect4/CDisconnect request NorthbridgeClock Control Cpuid Support Preliminary Information 68.3 W 53.7 W MaximumMaximum Typical 12.1 aClock Frequency Advanced 333 FSB Sysclk and SYSCLK# AC CharacteristicsParameter Description Minimum Maximum Duty CycleAdvanced 333 FSB AMD Athlon System Bus AC Characteristics Advanced 333 FSB AMD Athlon System Bus DC Characteristics Advanced 333 FSB AMD Athlon System Bus DC Characteristics2200 3200+ Maximum Typical 2100 3000+12.1 a 68.3 W 53.7 W 76.8 W 60.4 WAdvanced 400 FSB Sysclk and SYSCLK# AC Characteristics Advanced 400 FSB AMD Athlon System Bus AC Characteristics Advanced 400 FSB AMD Athlon System Bus DC Characteristics Advanced 400 FSB AMD Athlon System Bus DC CharacteristicsElectrical Data Interface Signal GroupingsInterface Signal Groupings ConventionsVID40 DC Characteristics Voltage Identification VID40Vcca AC and DC Characteristics Vcca AC and DC CharacteristicsFID30 DC Characteristics Frequency Identification FID30Vcccore Characteristics Vcccore AC and DC CharacteristicsVcccore Voltage Waveform Absolute Ratings Absolute RatingsSysclk and SYSCLK# DC Characteristics Sysclk and SYSCLK# DC CharacteristicsGeneral AC and DC Characteristics General AC and DC CharacteristicsInput Time to Acquire Signal Rise TimeSignal Fall Time Input Time to ReacquireOpen Drain Test Circuit 50 Ω ±3% Open-Drain Pin IOL = Output Current2Thermal Diode Electrical Characteristics Thermal Diode CharacteristicsCharacteristics Thermal DiodeGuidelines for Platform Thermal Protection of the Processor Symbol Parameter Description Max Units500 Apic Pins AC and DC Characteristics Apic Pin AC and DC CharacteristicsPreliminary Information Signal and Power-Up Requirements Power-Up RequirementsPwrok Preliminary Information Clock Multiplier Processor Warm Reset RequirementsSelection FID30 Mechanical Loading Mechanical DataDie Loading Location Dynamic MAX Static MAX Units Die Surface 100Letter or Minimum Maximum 453Preliminary Information Dimension 49.27 49.78 D1/E1 45.72 BSC 917 REF 42 REF 977 Preliminary Information Preliminary Information Pin Diagram and Pin Name Abbreviations Pin DescriptionsAMD Athlon XP Processor Bottomside View Pin Name Abbreviations AC31 Abbreviation Full Name Pin Q31 S31 U31 U37 W31 Y31 Y33AA31 AD30AG37 AE33AJ35 AL33E27 W33J35 E15F32 F24F28 F34AM10 AK34AK36 AM14V34 V30V32 V36Pin List No Pin Cross-Reference by Pin LocationPin Name A35 SDATA40# A37 SDATA30#E33 NC Pin E35 SDATA31# E37 SDATA22# SDATA52# E11 SDATA50# E13 SDATA49# E15E29 SDATA33# E31 SDATA32# Pin Name NC Pin F10NC Pin VID4 J31 J33 SDATA19# J35 NC Pin H10 H12H28 NC Pin H30 H32 H34 J37 SDATA29#S35 SDATA15# S37 Key Pin Q31 NC Pin Q33 SDATA24# Q35 SDATA17# Q37 SDATA16#S31 NC Pin S33 U31 NC Pin U33FID2 FID3 NC Pin Key Pin Y31 Y33 Y35 FID0 FID1NC Pin W31 W33 Y37 SDATA12#NC Pin AF10 AF12 NC Pin AD30 AD32AE31 NC Pin AE33 AF20AJ27 NC Pin AJ29 AH30 FSBSense1 AH32NC Pin AJ11 AJ13 Analog AJ15 AJ17 AJ19 AJ21 NC Pin AK10NC Pin Name AL25 NC Pin AL27 AL29NC Pin AM10 AN11 NC Pin AN13Detailed Pin Descriptions Pins Sysclk PinsCOREFB# Pins Connect PinFID30 Pins FID30 Clock Multiplier EncodingsIGNNE# Pin Front-Side Bus Sense Truth TableFLUSH# Pin INIT# PinKey Pins Jtag PinsK7CLKOUT# Pins NC PinsThermdc Pins SADDOUT10# PinsScan Pins VID40 PinsVrefsys Pin ZN and ZP PinsVID40 Code to Voltage Definition VID40Ordering Information Standard AMD Athlon XP Processor Model 10 ProductsPreliminary Information Ideal Diode Equation Constants and Variables for the Ideal Diode EquationTemperature Offset Correction --- I-- high------  Preliminary Information Signals and Bits Appendix BData Terminology Abbreviations Abbreviations and AcronymsAbbreviation Meaning Acronyms APINMI VGA Related Publications Preliminary Information