XMMA1000P XMMA2000W

6

Motorola Sensor Device Data

BASIC CONNECTIONS

Circuit Schematic

Figure 3 shows the recommended connection diagram for

operating the accelerometer. Figure 3 (a) shows the 16 pin

DIP package version, the XMMA1000P, while (b) shows the

6 pin Wingback package version, the XMMA2000W. For the

XMMA1000P, pins 1, 2, 3, 6, 14, 15, and 16 have no internal

connections, and pins 9 through 13 are used for calibration

and trimming in the factory. These pins should all be con-

nected to VSS, except pin 11 which must be connected to

VDD. For the XMMA2000W, pins 1 and 4, and the wings

(supporting pins) should be connected to VSS.

XMMA1000P

ST

VDD

TRIM 3

VSS

VOUT

OUTPUT

SIGNAL

R1

1 k

Ω

5

C2

0.01

µF

4

8

11

7

LOGIC

INPUT

VDD

C1

0.1

µF

(a)

XMMA2000W

ST

VDD

VSS

VOUT

OUTPUT

SIGNAL

R1

1 k

Ω

3

C2

0.01

µF

2

6

5

LOGIC

INPUT

VDD

C1

0.1

µF

(b)

Figure 3. Accelerometers with Recommended

Connection Diagram

PCB Layout

P0

A/D IN

VRH

VSS

VDD

ST

VOUT

VSS

VDD

0.01

µF

C

1 k

Ω

0.1

µF

C 0.1

µF

POWER SUPPLY

C

R

C

0.1

µF

NOTES:

• Use a .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 above.

• Use independent supply traces for the A/D reference

(microcontroller) and the accelerometer.

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

accelerometer to minimize induced errors.

• PCB layout of power and ground should not couple power

supply noise.

• Accelerometer and microcontroller should not be a high

current path.

• For ratiometricity purposes the accelerometer VDD and mi-

crocontroller A/D reference pin should be on the same

trace.

• 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.

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