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Motorola Sensor Device Data
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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)
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Freescale Semiconductor, Inc.
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