Chapter 7 Electrical Data 35

31993A-1 September 2004 AMD Sempron™ Processor Model 10 Data Sheet

AMD Preliminary Information

7.12 Thermal Diode Characteristics

The AMD Sempron 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 73.

For information about thermal design for the AMD Sempron

processor model 10, including layout and airflow

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 13 shows the AMD Sempron processor model 10 charac-

teristics of the on-die thermal diode. For information about cal-

culations for the ideal diode equation and 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 13. Thermal Diode Electrical Characteristics

Symbol

Parameter

Description

Min Nom Max Units Notes

Sourcing current 5300µA1

f, lumped

Lumped ideality

factor

1.00000 1.00374 1.00900 2, 3, 4

f, actual

Actual ideality factor 1.00261 3, 4

Series Resistance 0.93 Ω 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.

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 101 102

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