MPXM2102AS datasheet(338/670 Pages) MOTOROLA

338 / 670 page

AN935

3–192

Motorola Sensor Device Data

www.motorola.com/semiconductors

A second technique that still uses a single pressure

measurement as the input was investigated. In this method,

the sensitivity coefficients are calculated using a piece–wise

linearization technique where the total span variation is

divided into four windows of 10 mV (i.e., 30–39.99, 40–49.99,

etc.) and coefficients calculated for each window. The errors

that arise out of using this method are shown in Figures 10

through 13. This method results in a large majority of the

devices having errors <0.5%, while only one of the devices

was >1%. The sensitivity coefficients that are substituted into

equation [2] for the different techniques are given in Table 1.

It is important to note that for either technique the only

measurement that is required by the user in order to clearly

determine the sensitivity coefficients is the determination of

the full scale span of the particular pressure transducer.

Figure 10. Linearity Error of Piece–Wise Linear Fit at 1/4 FS

6.0

0.0

37.69

33.92

30.15

26.38

22.62

18.85

15.08

11.31

7.54

3.77

– 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 = 1/4 FS

Average Error = 0.18

Standard Deviation = 0.159

–1.8

Table 1. Comparison of Linearization Methods

SPAN WINDOW

GENERAL FIT

0.1045 + 2.95E – 3X

0.2055 + 1.598E – 3X + 1.723E – 4X2

1.293E – 13X5.681

PIECE–WISE LINEAR FIT

30–39.99

0.08209 – 2.246E – 3X

0.02433 = 1.430E – 2X

–1.961E – 4 + 8.816E – 6X

40–49.99

0.1803 – 4.67E – 3X

–0.119 + 1.655E – 2X

–1.572E – 3 + 4.247E – 5X

50–59.99

0.1055 – 3.051E – 3X

–0.355 + 2.126E – 2X

–5.0813 – 3 + 1.116E – 4X

60–69.99

–0.288 + 3.473E – 3X

–0.361 + 2.145E – 2X

–5.928E – 3 + 1.259E – 4X

X = Full Scale Span

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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