MPXM2102 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 MPXM2102 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

kPa

PSI

40

35

30

25

15

10

5

0

-5

025

3.62

50

7.25

75

10.87

100

14.5

SPAN

RANGE

(TYP)

OFFSET

(TYP)

20

TYP

MIN

P1 > P2

MAX

ORDERING INFORMATION

Device Type

Options

Device Type

Options

MPXM2102D

Non–ported

MPXM2102DT1

Non–ported, Tape and Reel

MPXM2102GS

Ported

MPXM2102GST1

Ported, Tape and Reel

MPXM2102A

Non–ported

MPXM2102AT1

Non–ported, Tape and Reel

MPXM2102AS

Ported

MPXM2102AST1

Ported, Tape and Reel