MPXM2102AS datasheet(534/670 Pages) MOTOROLA

534 / 670 page

AN1660

3–388

Motorola Sensor Device Data

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Table 1. Actual versus Modeled R(Temp)

Temp

Measured

R(Temp)

Compound

Model

Linear

Model

*40

406

372

*25

418

395

445

434

474

509

508

513

545

552

100

585

584

592

125

627

626

632

150

671

In Table 1, 25 and 150 degree Celsius data points were used

to determine both linear and compound temperature coeffi-

cients. Therefore, measured values, linear model values and

compound model values all match at these two temperatures.

At other temperatures, the linear model exhibits errors that are

significant when modeling piezoresistive pressure sensors.

The compound model, however, tracks with measured values

to within 1 Ohm out of 500 Ohms.

EXAMPLES

Two examples of what the model outputs look like are

shown in Figures 4 and 5. Figure 4 shows a sweep of pressure

versus output voltage (VOUT) at 0, 25, and 85 degrees Celsius,

for an MPX2010 sensor. It has the expected 0 to 25 mV output

voltage, given a 0 to 10 kPa pressure input. At these three

temperatures, compensation is sufficiently good that all three

plots look like the same straight line.

Figure 4. MPX2010 VOUT versus Pressure and Temperature

To produce the plot in Figure 4, the stimulus section is set

up as follows, and V(2,4) is probed.

***************************STIMULUS****************************

VCC 6 0 DC=10;

DC BIAS FROM PIN 3 TO PIN 1

.PARAM PRESSURE=0;

INPUT PRESSURE (kPa)

.DC PARAM PRESSURE 0_Kpa 10_Kpa .5_Kpa TEMP

LIST 0 25 85

*.DC PARAM TEMP –40 125 5

This is the default configuration with which the model is

shipped. To change to a sweep of zero pressure voltage ver-

sus temperature, an asterisk is placed on line 3 and removed

from line 4. The stimulus section then looks as follows:

****************************STIMULUS***************************

VCC 6 0 DC=10;

DC BIAS FROM PIN 3 TO PIN 1

.PARAM PRESSURE=0;

INPUT PRESSURE (kPa)

*.DC PARAM PRESSURE 0_Kpa 10_Kpa .5_Kpa TEMP

LIST 0 25 85

.DC PARAM TEMP –40 125 5

Again, V(2,4) is probed. The resulting output appears in

Figure 5.

This plot shows offset versus temperature performance that

is typical of MPX2000 series sensors. From

*40 to

)85

degrees Celsius, offset compensation is quite good. Above 85

degrees there is a hook in this curve, that is an important attrib-

ute of the sensor’s performance.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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