MPXM2102AS datasheet(565/670 Pages) MOTOROLA

565 / 670 page

AN4010

3–419

Motorola Sensor Device Data

www.motorola.com/semiconductors

Figure 2. Circuit Schematic

Voffset is the reference voltage for the first op-amp and is

pre-set with a voltage divider from the supply voltage. This

value is set to be 6.7 percent of the supply voltage. It is

important to keep this value relatively small simply because it

too is amplified by the second gain stage. It is also desirable

to have resistors R7 and R8 sufficiently large to reduce power

consumption.

The second gain stage takes the signal from the first gain

stage, V, and feeds it into the non-inverting input of a single

op-amp.

This op-amp is also configured with standard

non-inverting feedback, resulting in a gain of G2=R5/R6+1.

The default value is set to 2, but can easily be changed.

The signal produced at the output of the second stage

amplifier, V (op-amp pin 8) is the fully amplified signal. This is

calculated as

V2 = G2* V1. ….Equation (2)

From this point, there are two possible output types

available. One is a simple follower circuit, as shown in Figure

3, in which the circuit output, Vout (op-amp pin 14), is

essentially a buffered V signal. This analog output option is

available for applications in which the real time nature of the

pressure signal needs to be measured. This option is selected

by connecting jumpers J5 and J6. J4 and J7 are not connected

for analog output.

The second output choice, a switch output as shown in

Figure 4, is accomplished by setting jumpers J4 and J7, and

leaving J5 and J6 unconnected. This is appropriate for

applications in which a switching function is desired. In this

case, the fourth op-amp is configured as a comparator, which

will invert V2, high or low, depending on whether V2 is larger

or smaller than the preset reference signal, set by trim-pot R9.

This signal can be used to simulate a real world threshold.

Figure 3. Analog Output Jumper Settings

Figure 4. Switch Output Jumper Settings

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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