MPXM2202AS datasheet(95/670 Pages) MOTOROLA

95 / 670 page

MMA3201D

2–59

Motorola Sensor Device Data

www.motorola.com/semiconductors

Pin No.

Name

Description

1 thru 3

—

Redundant Vss. Leave unconnected.

—

No internal connection. Leave

unconnected.

Logic input pin used to initiate

self–test.

XOUT

Output voltage of the accelerometer.

X Direction.

STATUS

Logic output pin to indicate fault.

VSS

The power supply ground.

VDD

Power supply input.

AVDD

Power supply input (Analog).

YOUT

Output voltage of the accelerometer.

Y Direction.

12 thru 16

—

Used for factory trim. Leave

unconnected.

17 thru 20

—

No internal connection. Leave

unconnected.

XOUT

YOUT

MMA3201D

VDD

VSS

X OUTPUT

SIGNAL

1 k

Ω

0.01

µF

LOGIC

INPUT

VDD

0.1

µF

Figure 4. SOIC Accelerometer with Recommended

Connection Diagram

STATUS

Y OUTPUT

SIGNAL

0.01

µF

1 k

Ω

AVDD

PCB Layout

A/D IN

VRH

VSS

VDD

YOUT

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

A/D IN

XOUT

0.01

µF

1 k

Ω

NOTES:

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

source.

• Physical coupling distance of the accelerometer to the mi-

crocontroller 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 outputs 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) 95 Page - Motorola, Inc

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