MPXM2102AS datasheet(532/670 Pages) MOTOROLA

532 / 670 page

AN1660

3–386

Motorola Sensor Device Data

www.motorola.com/semiconductors

MPX2000 Series:

The MPX2000 Series sensors (MPX2010, MPX2050,

MPX2100, and MPX2200) add span compensation and trim

resistors to the Uncompensated model. These resistors are

shown in Figure 2 as RS9, RS11, and RS10. The temperature

coefficient of resistance (TCR) for the bridge resistors works

against fixed resistors RS9 and RS11 to produce a bias to the

bridge that increases with temperature. This increasing bias

compensates for the temperature coefficient of span, which is

negative.

Resistor RS12 is also added to the Uncompensated model.

It represents additional impedance that is associated with the

MPX2000 series sensors’ offset trim network. Offset perfor-

mance is modeled behaviorally. Inputs for offset (VOFFSET)

and temperature coefficient of offset (TCOS) are translated

into bridge resistance values that produce the specified per-

formance. This behavioral approach was chosen in order to

make it easy to plug in different values for VOFFSET and

TCOS.

Figure 2. MPX2000 Series PSPICE Compound Coefficient Model

NOTES:

* TEMPERATURE SENSITIVE

* * TEMPERATURE & PRESSURE SENSITIVE

RS11

RS4

RS1

RS2

RS3

RS9

RS8

RS7

RS12

RS5

RS6

RS10

MPX5000 Series:

The MPX5000 Series sensors (MPX5010, MPX5050,

MPX5100, MPX5700, and MPX5999) add an instrumentation

amplifier to the MPX2000 series model. This amplifier is

shown in Figure 3. It consists of operational amplifiers ES1,

ES2, ES3, and ES4. Amplifiers ES1, ES2 and ES3 are mod-

eled as voltage controlled voltage sources with gains of

100,000. Offset voltage, input bias current effects, etc. are tak-

en into account with the values that are used to determine off-

set voltage and temperature coefficient of the sensor bridge.

Amplifier ES4 models saturation voltage. Its output follows the

output of ES3 with saturation limits at 75 millivolts and 4.9 volts.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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