MPXM2102AS datasheet(34/670 Pages) MOTOROLA

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Motorola Sensor Device Data

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INDUSTRY STANDARDIZATION

Why an industry standard? The increasing use of electronic

sensors in everyday life has designers wrestling with the

complexity of defining the compatibility of a sensor with the

media they are measuring. A designer may decide to solve the

question of media compatibility by choosing to isolate the

sensor from the media via a stainless steel diaphragm. While

this solution provides very good media isolation, it is not

without some drawbacks such as cost, size of packaging,

decreased sensitivity and long term drift. Without a recognized

standard for defining media compatibility, the designer is left

to a series of ad hoc test methods and conflicting

specifications.

An industry media compatibility standard will provide the

designer with a method of evaluating sensor performance.

The designer could match an application’s requirements, for

media compatibility, with the available sensor products thus

taking price and performance into account. This will enable the

designer to minimize the total cost of an application. A

standard will also enable suppliers to provide products

warranted to defined criteria. Once a standard is adopted, the

suppliers may rationalize their test efforts and pass the

savings on to their customers.

A standard should provide a designer with a simple,

coherent, complete definition of a media’s effects on a sensor.

The standard should included an accepted test methodology,

test equipment guidelines, life time model, acceleration

factors model, and a definition of failures. A proposed list of

criteria to include in a model are shown in table 4.

Table 4. Suggested Criteria for Media Compatibility

Media Contact — Front or Back

Supply Voltage

Solubility Parameter

Pressure Range

Supply Voltage Duty Cycle

Conductivity of Media

Temperature Range

Voltage Potential within Media

Recipe of Media and Contaminants

Frequency Output is Measured

Lifetime Expectancy

Sensor to Media Interconnection

Relative Motion of Media (e.g., Flow)

These criteria must be included not only for the media, but

also for the contaminants in the media. An example is a

washing machine level sensor which must be compatible with

water vapor (the media) and detergent and chlorine (the

contaminant). To create a standard, a series of tests which

benchmark the criteria must be designed and performed. The

results would form the basis of the life time and acceleration

factor models.

There are several ways to create a standard, each of which

have their own associated pros and cons. Three possible

ways to create a standard are: an industry association

committee, a panel of industry representatives, or a de facto

standard set by one or more industry suppliers. To define a

standard for media compatibility may require more than one

of these methods. An industry leader may define a standard

form to which they deliver product. This may stimulate the

formation of a committee which defines a broader standard for

the industry. As this standard becomes more accepted by the

industry, the committee may work with an industry association

to “legitimize” the de facto standard. No matter how the

standard is formulated, receiving broad industry acceptance

will require meeting the customers’ needs.

CONCLUSION

Investigation of media compatibility for pressure sensors

has been presented from a physics–of–failure approach. We

have developed a set of internal standard test and reliability

lifetime analysis procedures to simulate our customers’

requirements. These activities have incorporated information

from several fields beyond sensors and/or electronics,

including: electrochemistry and corrosion, polymers, safety

and environmental, automotive and appliance industry

standards, and reliability. The next critical step to elevating the

awareness of this problem, in our opinion, is to develop an

industry–wide

set

standards,

driven

customer

applications,

that

include

media

testing

experimental

procedures,

reliability

lifetime

analysis,

and

media

compatibility reporting to allow easier customer interpretation

of results.

ACKNOWLEDGMENTS

Many

individuals

have

contributed

the

media

compatibility

initiative

and

are

deserving

acknowledgment. The individuals include Debi Beall, Gordon

Bitko, Jerry Cripe, Bob Gailey, Jim Kasarskis, John Keller,

Betty Leung, Jeanene Matkin, Mike Menchio, Adan Ramirez,

Chuck Reed, Laura Rivers, Scott Savage, Mahesh Shah,

Mario Velez, John Wertz, MEMS1, MKL, Reliability Lab,

Characterization Lab, and the Prototype Lab.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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