LM86EVAL/NOPB National Semiconductor, LM86EVAL/NOPB Datasheet - Page 18

• Manufacturer Part Number: LM86EVAL/NOPB
• Description: BOARD EVALUATION LM86
• Manufacturer: National Semiconductor

Specifications of LM86EVAL/NOPB

• Sensor Type: Temperature
• Sensing Range: 0°C ~ 125°C
• Interface: SMBus (2-Wire/I²C)
• Sensitivity: ±1°C
• Voltage - Supply: 3 V ~ 3.6 V
• Embedded: No
• Utilized Ic / Part: LM86
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q3975531

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3.0 Application Hints
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
Error Caused by Non-Ideality Factor
FIGURE 12.
Compensating for an Untargeted Non-Ideality Factor
(Continued)
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FIGURE 14.
18
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
requesting further information on our recommended setting
of the offset register for different processor types.
Errors Induced when Temperature Sensor is Not
Calibrated to Typical Non-Ideality
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FIGURE 13.
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