MPXM2202AS datasheet(82/670 Pages) MOTOROLA

82 / 670 page

MMA2201D

2–46

Motorola Sensor Device Data

www.motorola.com/semiconductors

Pin No.

Pin Name

Description

1 thru 3

—

No internal connection. Leave

unconnected.

Logic input pin used to initiate

self–test.

VOUT

Output voltage of the accelerome-

ter.

—

No internal connection. Leave

unconnected.

VSS

The power supply ground.

VDD

The power supply input.

9 thru 13

Trim pins

Used for factory trim. Leave

unconnected.

14 thru 16

—

No internal connection. Leave

unconnected.

MMA2201D

VDD

VSS

VOUT

OUTPUT

SIGNAL

1 k

Ω

0.01

µF

LOGIC

INPUT

VDD

0.1

µF

Figure 4. SOIC Accelerometer with Recommended

Connection Diagram

STATUS

PCB Layout

A/D IN

VRH

VSS

VDD

VOUT

VSS

VDD

0.01

µF

1 k

Ω

0.1

µF

C 0.1

µF

POWER SUPPLY

0.1

µF

Figure 5. Recommend PCB Layout for Interfacing

Accelerometer to Microcontroller

STATUS

NOTES:

• Use a 0.1 µF capacitor on VDD to decouple the power

source.

• Physical coupling distance of the accelerometer to the

microcontroller should be minimal.

• Place a ground plane beneath the accelerometer to reduce

noise, the ground plane should be attached to all of the

open ended terminals shown in Figure 4.

• Use an RC filter of 1 kΩ and 0.01 µF on the output of the

accelerometer to minimize clock noise (from the switched

capacitor filter circuit).

• PCB layout of power and ground should not couple power

supply noise.

• Accelerometer and microcontroller should not be a high

current path.

• A/D sampling rate and any external power supply switching

frequency should be selected such that they do not inter-

fere with the internal accelerometer sampling frequency.

This will prevent aliasing errors.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MPXM2202AS Datasheet(PDF) 82 Page - Motorola, Inc

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