5

Motorola Sensor Device Data

MMA2260D

BASIC CONNECTIONS

10

11

12

13

14

15

16

8

7

6

5

4

3

2

1

9

STATUS

ST

N/C

N/C

N/C

N/C

N/C

N/C

N/C

N/C

Figure 3. Pinout Description

Pin No.

Pin Name

Description

1thru3

Redundant connections to the internal

4

Output voltage of the accelerometer.

5

STATUS

Logic output pin used to indicate fault.

6

The power supply input.

7

The power supply ground.

8

ST

Logic input pin used to initiate self--

test.

9thru13

Trim pins

Used for factory trim.

Leave unconnected.

14 thru 16

—

No internal connection.

Leave unconnected.

Figure 4. SOIC Accelerometer with Recommended

Connection Diagram

MMA2260D

ST

OUTPUT

SIGNAL

R1

1kΩ

4

C2

0.1 µF

8

6

7

LOGIC

INPUT

C1

0.1 µF

STATUS

5

PCB Layout

P0

A/D IN

ST

0.1 µF

C

1kΩ

0.1 µF

C 0.1 µF

POWER SUPPLY

C

R

C

0.1 µF

Figure 5. Recommended PCB Layout for Interfacing

Accelerometer to Microcontroller

P1

STATUS

NOTES:

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

• UseanRCfilter of 1kΩ 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