MPXM2202 SERIES

3

Motorola Sensor Device Data

LINEARITY

Linearity refers to how well a transducer’s output follows

pressure range. There are two basic methods for calculating

nonlinearity: (1) end point straight line fit (see Figure 2) or (2)

a least squares best line fit. While a least squares fit gives

the “best case” linearity error (lower numerical value), the

calculations required are burdensome.

Conversely, an end point fit will give the “worst case” error

(often more desirable in error budget calculations) and the cal-

culations are more straightforward for the user. Motorola’s

specified pressure sensor linearities are based on the end

point straight line method measured at the midrange pressure.

Figure 2. Linearity Specification Comparison

LEAST

SQUARE

DEVIATION

PRESSURE (% FULLSCALE)

0

50

100

END POINT

STRAIGHT LINE FIT

EXAGGERATED

PERFORMANCE

CURVE

LEAST SQUARES FIT

STRAIGHT LINE

DEVIATION

OFFSET

ON–CHIP TEMPERATURE COMPENSATION and CALIBRATION

Figure 3 shows the minimum, maximum and typical output

characteristics of the MPXM2202 series at 25

°C. The output

is directly proportional to the differential pressure and is es-

sentially a straight line.

A silicone gel isolates the die surface and wire bonds from

the environment, while allowing the pressure signal to be

transmitted to the silicon diaphragm.

Figure 3. Output versus Pressure Differential

40

35

30

25

20

15

10

5

0

-5

050

7.25

100

14.5

150

21.75

200

29

PRESSURE

SPAN

RANGE

(TYP)

OFFSET

kPa

PSI

P1 > P2

25

75

125

175

MAX

TYP

MIN

ORDERING INFORMATION

Device Type/Order No

Options

Case Type

Device Type/Order No.

Options

Case Type

MPXM2202D

Non–ported

1320

MPXM2202DT1

Non–ported, Tape and Reel

1320

MPXM2202GS

Ported

1320A

MPXM2202GST1

Ported, Tape and Reel

1320A

MPXM2202A

Non–ported

1320

MPXM2202AT1

Non–ported, Tape and Reel

1320

MPXM2202AS

Ported

1320A

MPXM2202AST1

Ported, Tape and Reel

1320A

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com