Rainbow-electronics LM86 Manual do Utilizador descarregar pdf (Página 18)

3.0 Application Hints (Continued)

mobile Pentium III processor, 1.008. When a temperature

sensor calibrated for a particular processor type is used with

a different processor type or a given processor type has a

non-ideality that strays from the typical, errors are intro-

duced. Figure 12 shows the minimum and maximum errors

introduced to a temperature sensor calibrated specifically to

the typical value of the processor type it is connected to. The

errors in this figure are attributed only to the variation in

non-ideality from the typical value. In Figure 13 is a plot of

the errors that result from using a temperature sensor cali-

brated for a Pentium II, the LM84, with a typical Pentium 4 or

AMD Athlon MP Model 6.

Temperature errors associated with non-ideality may be re-

duced in a specific temperature range of concern through

use of the offset registers (11h and 12h). Figure 14 shows

how the offset register may be used to compensate for the

non-ideality errors shown in Figure 13. For the case of

non-ideality=1.008, the offset register was set to −0.5˚C

resulting in the calculated residual error as shown in Figure

14. This offset has resulted in an error of less than 0.05˚C for

the temperatures measured in the critical range between 60

to 100˚C. This method yeilds a first order correction factor.

Please send an email to hardware.monitor.team

nsc.com

requesting further information on our recommended setting

of the offset register for different processor types.

10130337

Error Caused by Non-Ideality Factor

FIGURE 12.

10130336

Errors Induced when Temperature Sensor is Not

Calibrated to Typical Non-Ideality

FIGURE 13.

10130338

Compensating for an Untargeted Non-Ideality Factor

FIGURE 14.

LM86

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