MMA1252 datasheet(5/10 Pages) FREESCALE

5 / 10 page

MMA1252

Sensors

Freescale Semiconductor, Inc.

BASIC CONNECTIONS

Pinout Description

Figure 5. SOIC Accelerometer with Recommended

Connection Diagram

PCB Layout

Figure 6. Recommended PCB Layout for Interfacing

Accelerometer to Microcontroller

NOTES:

1. Use a 0.1

F capacitor on V

DD to decouple the power

source.

2. Physical coupling distance of the accelerometer to the

microcontroller should be minimal.

3. 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 6.

4. Use an RC filter of 1 k

 and 0.1 F on the output of the

accelerometer to minimize clock noise (from the

switched capacitor filter circuit).

5. PCB layout of power and ground should not couple

power supply noise.

6. Accelerometer and microcontroller should not be a

high current path.

7. A/D sampling rate and any external power supply

switching frequency should be selected such that they

do not interfere with the internal accelerometer

sampling frequency. This will prevent aliasing errors.

Table 3. Pin Descriptions

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 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.

VSS

VOUT

STATUS

VDD

VSS

N/C

MMA1252

VDD

VSS

VOUT

OUTPUT

SIGNAL

1 k



0.1

F

LOGIC

INPUT

VDD

0.1

F

STATUS

VSS

A/D In

VRH

VSS

VDD

VOUT

VSS

VDD

0.1

F

1 k



0.1

F

0.1

F

Power Supply

0.1

F

STATUS

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