MPXM2010GS datasheet(160/670 Pages) MOTOROLA

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Motorola Sensor Device Data

www.motorola.com/semiconductors

Pressure Sensor FAQ’s

We have discovered that many of our customers have

similar questions about certain aspects of our pressure

sensor technology and operation. Here are the most

frequently asked questions and answers that have been

explained in relatively non–technical terms.

Q. How do I calculate total pressure error for my

applications?

A. You can calculate total error in two fashions, worst case

error and most probable error. Worst case error is taking

all the individual errors and adding them up, while most

probable error sums the squares of the individual errors

and then take the square root of the total. In summary,

Error (Worst Case) = E1 + E2 + E3 + ... + En, while Error

(Most Probable) = SQRT[(E1)2 + (E2)2 + (E3)2 + ...

(En)2]; Please note that not all errors may apply in your

individual application.

Q. What is the media tolerance of our pressure sen-

sors?

A. Most Motorola pressure sensors are specifically de-

signed for dry air applications. However, Motorola now

offers an MPXAZ series specifically designed for im-

proved media resistance. This series incorporates a

durable barrier that allows the sensor to operate reliably

in high humidity conditions as well as environments

containing common automotive media. NOTE: Applica-

tions exposing the sensor to media other than what has

been specified could potentially limit the lifetime of the

sensor. Please consult the Motorola factory for more

information regarding media compatibility in your specific

application.

Q. Can I pull a vacuum on P1?

A. Motorola pressure sensors are designed to measure

pressure in one direction and are not bi–directional. It is

possible to measure either a positive pressure OR a

negative pressure, but not both. For example, the sensor

can be designed to accept a ”positive” pressure on the

P1 port, providing that P1 is greater or equal to P2 while

staying with in the sensors specified pressure range. Or,

the sensor can measure ”negative” pressure (a vacu-

um)by applying the pressure to the P2 port, again while

P1 is greater or equal to P2 and staying within the

sensors specified range.

Our pressure sensors are based on a silicon diaphragm

and can not tolerate a pressure that alternates from

positive to negative without resulting damage. The

devices are rated for over pressure and burst but should

not be intentionally designed to operate in a bi–direction-

al manner.

If you need to measure both a positive and negative

pressure within the same system, we suggest designing

with two separate sensors, one for each pressure type.

Or, a mechanical pressure transducer should be utilized.

Q. What will happen if I run the pressure sensor beyond

the rated operating pressure?

A. For bare elements (uncompensated and compensated

series devices), when you take the sensor higher than

the rated pressure, the part will still provide an output

increasing linearly with pressure. When you go below the

minimum rated pressure, the output of the sensor will

eventually go negative. Motorola, however, does not

guarantee electrical specifications beyond the rated

operating pressure range specified in the data sheet of

each device. The integrated series devices will not

function at all beyond the rated pressure of the part.

These series of parts will saturate at near 4.8 V and 0.2 V

and thus no further change in output will occur.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MPXM2010GS 数据表(PDF) 160 Page - Motorola, Inc

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