MPXM2102AS datasheet(142/670 Pages) MOTOROLA

142 / 670 page

AN1925

2–106

Motorola Sensor Device Data

www.motorola.com/semiconductors

BOARD LAYOUT AND CONTENT

Figures 4 and 5 show the layout used on the evaluation

board. Through–hole mounting components have been

selected to facilitate component replacement.

MOUNTING CONSIDERATIONS

System design and sensor mounting can affect the

response of a sensor system. The placement of the sensor

itself is critical to obtaining the desired measurements. It is

important that the sensor be mounted as rigidly as possible to

obtain accurate results. Since the thickness and mounting of

the board varies, parasitic resonance may distort the sensor

measurement. Hence, it is vital to fasten and secure to the

largest mass structure of the system, i.e. the largest truss, the

largest mass, the point closest to source of vibration. On the

other hand, dampening of the sensor device can absorb much

of the vibration and give false readings as well. The evaluation

board has holes on the four corners of the board for mounting.

It is important to maintain a secure mounting scheme to

capture the true motion.

Orientation of the sensor is also crucial. For best results,

align the sensitive axis of the accelerometer to the axis of

vibration. In the case of the MMA1220D, the sensitive axis is

perpendicular to the plane of the evaluation board.

SUMMARY

The Accelerometer Evaluation Board is a design–in tool for

customers seeking to quickly evaluate an accelerometer in

terms of output signal, device orientation, and mounting

considerations. Both through–hole and surface mount

packages can be evaluated. With the battery supply option

and corner perforations, the board can easily be mounted on

the end product; such as a motor or a piece of equipment.

Easy access to the main pins allows for effortless interfacing

to a microcontroller or other system electronics. The simplicity

of this evaluation board provides reduced development time

and assists in selecting the best accelerometer for the

application.

Figure 4. Board Layout (Component Side)

Figure 5. Board Layout (Back Side)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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