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12 thermal diode characteristics, Thermal diode electrical characteristics, Thermal protection characterization – AMD Athlon 27493 User Manual

Page 51: Thermal diode characteristics, Thermal diode electrical characteristics t, Table 17

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Chapter 8

Electrical Data

39

26237C—May 2003

AMD Athlon™ XP Processor Model 10 Data Sheet

Preliminary Information

8.12

Thermal Diode Characteristics

The AMD Athlon XP processor model 10 provides a diode that
can be used in conjunction with an external temperature sensor
to determine the die temperature of the processor. The diode
anode (THERMDA) and cathode (THERMDC) are available as
pins on the processor, as described in “THERMDA and
THERMDC Pins” on page 77.

For information about thermal design for the AMD Athlon XP
p r o c e s s o r m o d e l 1 0 , i n c l u d i n g l ay o u t a n d a i r f l o w
considerations, see the AMD Processor Thermal, Mechanical, and
Chassis Cooling Design Guide
, order# 23794, and the cooling
guidelines on http://www.amd.com.

Thermal Diode
Electrical
Characteristics

Table 17 shows the AMD Athlon XP processor model 10
characteristics of the on-die thermal diode. For information
a b o u t c a l c u l a t i o n s fo r t h e i d e a l d i o d e e q u a t i o n a n d
temperature offset correction, see Appendix A, "Thermal
Diode Calculations," on page 77.

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.

Table 17. Thermal Diode Electrical Characteristics

Symbol

Parameter

Description

Min

Nom

Max

Units

Notes

I

Sourcing current

5

300

µA

1

n

f, lumped

Lumped ideality
factor

1.00000

1.00374

1.00900

2, 3, 4

n

f, actual

Actual ideality factor

1.00261

3, 4

R

T

Series Resistance

0.93

3, 4

Notes:

1. The sourcing current should always be used in forward bias only.
2. Characterized at 95°C with a forward bias current pair of 10

µA and 100 µA. AMD

recommends using a minimum of two sourcing currents to accurately measure the
temperature of the thermal diode.

3. Not 100% tested. Specified by design and limited characterization.
4. The lumped ideality factor adds the effect of the series resistance term to the actual ideality

factor. The series resistance term indicates the resistance from the pins of the processor to the
on-die thermal diode. The value of the lumped ideality factor depends on the sourcing current
pair used.

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