Small and Thin ±18 g Accelerometer

ADXL321

Rev. 0

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FEATURES

Small and thin

4 mm × 4 mm × 1.45 mm LFCSP package

3 mg resolution at 50 Hz

Wide supply voltage range: 2.4 V to 6 V

Good zero g bias stability

Good sensitivity accuracy

X-axis and Y-axis aligned to within 0.1° (typ)

BW adjustment with a single capacitor

Single-supply operation

10,000 g shock survival

Compatible with Sn/Pb and Pb-free solder processes

APPLICATIONS

Vibration monitoring and compensation

Abuse event detection

Sports equipment

GENERAL DESCRIPTION

The ADXL321 is a small and thin, low power, complete dual-

axis accelerometer with signal conditioned voltage outputs,

which is all on a single monolithic IC. The product measures

acceleration with a full-scale range of ±18 g (typical). It can also

measure both dynamic acceleration (vibration) and static

acceleration (gravity).

The ADXL321’s typical noise floor is 320 µg/√Hz, allowing

signals below 3 mg to be resolved in tilt-sensing applications

using narrow bandwidths (<50 Hz).

The user selects the bandwidth of the accelerometer using

0.5 Hz to 2.5 kHz may be selected to suit the application.

The ADXL321 is available in a very thin 4 mm × 4 mm ×

1.45 mm, 16-lead, plastic LFCSP.

FUNCTIONAL BLOCK DIAGRAM

ADXL321

SENSOR

+3V

OUTPUT

AMP

OUTPUT

AMP

COM

ST

DEMOD

AC

AMP

32k

Ω

XOUT

YOUT

32k

Ω

Figure 1.