Intel 200 User Manual

Thermal and Mechanical Design Guidelines 

 33 

In order to accurately measure the processor power consumption, it is required to 

attach sense resistor and replace one of the motherboard resistors.  Schematic 

diagram in Figure 13 illustrates the precision resistor (R

SENSE

) attached in series with 

processor circuitry.  The processor power consumption can be estimated by  

Equation 5  P

D

 = V

CC

 × (V

i

 / R

SENSE

) 

 

Where: 

P

D

 

=  Processor total power dissipation (W) (assumes all power dissipates 

through the processor die) 

V

CC

 

=  Processor core voltage. 

V

i

 

=  Voltage measured across precision sense resistor.  

R

SENSE

 =  Given resistance value of precision resistor.  

The Isotek 4 terminal (Kelvin) precision resistor (with resistance of 1 mΩ and 

Tol=0.1%) is recommended to be used for processor power measurement.  Locate the 

inductor L1VR inductor (near processor) on motherboard and attach the Isotek 

precision resistor in-series with inductor as illustrated in Figure 13 schematic and 

Figure 14 board layout schematic diagram.  Additionally, it is required to replace 

R27VR chip resistor (near processor) with a 19.6 KΩ rated chip resistor as illustrated 

in Figure 15.  The Walsin chip resistor (WR06X1962FTL) is one of the recommended 

chip resistors for the rework.  

9.  Isotek 4 terminal 

(Kelvin) precision 
resistor 

10.  1 11.  P/N A-N-R001-F1-K2-0.1. 

R=1 mΩ, Tol=0.1%, P=2W, 
TCR<10 ppm/°C 

12. 

1
 

13.  Walsin chip 

resistor 

14.  1 15.  WR06X1962FTL. R= 19.6 KΩ,  

Tol =1%, P=0.1W, TCR<200 
ppm/°C. 

16. 

2
 

NOTE:   

1. 

2.