MPX2202DP datasheet(340/670 Pages) MOTOROLA

340 / 670 page

AN935

3–194

Motorola Sensor Device Data

www.motorola.com/semiconductors

Figure 13. Linearity Error of Piece–Wise Linear Fit at FS

52.5

37.5

22.5

7.5

0.0

38.46

34.62

30.77

26.92

23.08

19.23

15.38

11.54

7.69

3.85

– 2.0

–1.6 –1.4 –1.2 –1.0 – 0.8 – 0.6 – 0.4 – 0.2 0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

NO. OF UNITS

LINEARITY ERROR (% FS)

General Fit

P = 1 FS

Average Error = 0.13

Standard Deviation = 0.186

–1.8

Once the sensitivity coefficients have been determined, a

system can then be built that provides an accurate output

function with pressure. The system shown in Figure 14

consists

pressure

transducer,

temperature

compensation and amplification stage, an A/D converter, a

microprocessor, and a display. The display block can be

replaced with a control function if required. The A/D converter

simply transforms the voltage signal to an input signal for the

microprocessor, in which resides the look–up table of the

transfer function generated from the previously determined

sensitivity coefficients. The microprocessor can then drive a

display or control circuit using standard techniques.

SUMMARY

While at first glance this technique appears to be fairly

complicated, it can be a very cost effective method of building

high–accuracy,

high–sensitivity

pressure–monitoring

system for low–pressure ranges.

Figure 14. Linearization System Block Diagram

X–DUCER

TEMPERATURE

COMPENSATION

AND AMPLIFICATION

MICROCONTROLLER

MC68HC908QT4

DISPLAY

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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