MPXM2102AS datasheet(70/670 Pages) MOTOROLA

70 / 670 page

MMA1260D

2–34

Motorola Sensor Device Data

www.motorola.com/semiconductors

BASIC CONNECTIONS

VSS

VOUT

STATUS

VDD

VSS

N/C

Figure 4. Pinout Description

Pin No.

Pin Name

Description

1 thru 3

VSS

Redundant connections to the internal

VSS and may be left unconnected.

VOUT

Output voltage of the accelerometer.

STATUS

Logic output pin used to indicate fault.

VDD

The power supply input.

VSS

The power supply ground.

Logic input pin used to initiate self–

test.

9 thru 13

Trim pins

Used for factory trim.

Leave unconnected.

14 thru 16

—

No internal connection.

Leave unconnected.

Figure 5. SOIC Accelerometer with Recommended

Connection Diagram

MMA1260D

VDD

VSS

VOUT

OUTPUT

SIGNAL

1 k

Ω

0.1

µF

LOGIC

INPUT

VDD

0.1

µF

STATUS

VSS

PCB Layout

A/D IN

VRH

VSS

VDD

VOUT

VSS

VDD

0.1

µF

1 k

Ω

0.1

µF

C 0.1

µF

POWER SUPPLY

0.1

µF

Figure 6. Recommended 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 mi-

crocontroller should be minimal.

• Place a ground plane beneath the accelerometer to reduce

noise, the ground plane should be attached to all internal

VSS terminals shown in Figure 4.

• Use an RC filter of 1 kΩ and 0.1 µF on the output of the ac-

celerometer 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

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