MPXM2102AS datasheet(40/670 Pages) MOTOROLA

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Motorola Sensor Device Data

www.motorola.com/semiconductors

Acceleration Sensor FAQ’s

We have discovered that many of our customers have

similar questions about certain aspects of our accelerome-

ter’s technology and operation. Here are the most frequently

asked questions and answers that have been explained in

relatively non–technical terms.

Q. What is the g–cell?

A. The g–cell is the acceleration transducer within the

accelerometer device. It is hermetically sealed at the

wafer level to ensure a contaminant free environment,

resulting in superior reliability performance.

Q. What does the output typically interface with?

A. The accelerometer device is designed to interface with an

analog to digital converter available on most microcontrol-

lers. The output has a 2.5 V DC offset, therefore positive

and negative acceleration is measurable. For unique

customer applications, the output voltage can be scaled

and shifted to meet requirements using external circuitry.

Q. What is the resonant frequency of the g–cell?

A. The resonant frequency of the g–cell is much higher than

the cut–off frequency of the internal filter. Therefore, the

resonant frequency of the g–cell does not play a role in

the accelerometer response.

Q. What is ratiometricity?

A. Ratiometricity simply means that the output offset

voltage and sensitivity scales linearly with applied supply

voltage. That is, as you increase supply voltage the

sensitivity and offset increase linearly; as supply voltage

decreases, offset and sensitivity decrease linearly. This

is a key feature when interfacing to a microcontroller or

an A/D converter. Ratiometricity allows for system level

cancellation of supply induced errors in the analog to

digital conversion process. Refer to the Special Features

section under the Principle of Operation for more

information.

Q. Is the accelerometer device sensitive to electro

static discharge (ESD)?

A. Yes. The accelerometer should be handled like other

CMOS technology devices.

Q. Can the g–cell part “latch’’?

A. No, overrange stops have been designed into the g–cell to

prevent latching. (Latching is when the middle plate of

the g–cell sticks to the top or bottom plate.)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MPXM2102AS 数据表(PDF) 40 Page - Motorola, Inc

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