MPXM2102AS datasheet(140/670 Pages) MOTOROLA

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Motorola Sensor Device Data

www.motorola.com/semiconductors

AN1925

Using the Motorola Accelerometer

Evaluation Board

Prepared by: Leticia Gomez and Raul Figueroa

Sensor Products Division

Systems and Applications Engineering

INTRODUCTION

This application note describes the Motorola Accelerometer

Evaluation Board (Figure 1). The Accelerometer Evaluation

Board is a small circuit board intended to serve as an aid in

system design with the capability for mounting the following

devices: MMA1220D, MMA1201P, MMA1200D, MMA2201D.

This evaluation board is useful for quickly evaluating any of

these three devices. It also provides a means for

understanding the best mounting position and location of an

accelerometer in your product.

CIRCUIT DESCRIPTION

Figure 2 is a circuit schematic of the evaluation board. The

recommended decoupling capacitor at the power source and

recommended RC filter at the output, are included on the

evaluation board. This RC filter at the output of the

accelerometer minimizes clock noise that may be present

from the switched capacitor filter circuit. No additional

components are necessary to use the evaluation board.

Refer to the respective datasheet of the device being used

for

specifications

and

technical

operation

the

accelerometer.

The evaluation board has a 4–pin header (J1 in Figure 1) for

interfacing to a 5 volt power source or a 9 to 15 volt power

source (for example, 9 V battery). Jumper JP1 (see Figure 1)

must have the following placement: on PS if a 5 V supply is

being used or on BATT if a 9 V to 15 V supply is used. A 5 V

regulator (U1 in figure 1) supplies the necessary power for the

accelerometer in the BATT option.

The power header also provides a means for connecting to

the accelerometer analog output through a wire to another

breadboard or system. Four through–hole sockets are

included to allow access to the following signals: VDD, GND,

ST and STATUS. These sockets can be used as test points or

as means for connecting to other hardware.

The

ON/OFF

switch

(S1)

provides

power

the

accelerometer and helps preserve battery life if a battery is

being used as the power source. S1 must be set towards the

“ON” position for the accelerometer to function. The green

LED (D1) is lit when power is supplied to the accelerometer.

A self–test pushbutton (S2) on the evaluation board is a

self–test feature that provides verification of the mechanical

and electrical integrity of the accelerometer. The STATUS pin

is an output from the fault latch and is set high if one of the fault

conditions exists. A second pressing of the pushbutton (S2)

resets the fault latch, unless of course one or more fault

conditions continue to exist.

Figure 1. Motorola Accelerometer Evaluation Board

Jumper (JP1)

5 V Regulator

Power Header

On/Off Switch

(S1)

Power LED (D1)

Test Points

Self–Test

Pushbutton (S2)

MMA Device

Mounting

Hole (1 of 4)

(U1)

BATT

STATUS

(J1)

Accelerometer Output

(Vout)

MOTOROLA

SEMICONDUCTOR APPLICATION NOTE

REV 0

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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