LIS3L02AS5TR データシートの表示（PDF） - STMicroelectronics

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LIS3L02AS5TR

MEMS INERTIAL SENSOR: 3-axis - ±2g/6g LINEAR ACCELEROMETER

STMicroelectronics 

4 Application hints

4 Application hints

Figure 3. LIS3L02AS5 Electrical Connection

LIS3L02AS5

Vdd

10µF 100nF

GND GND

GND

ST

LIS3L02AS5

(top view)

GND

PD

FS

Cload z

Cload x

Cload y

Optional

Vout Z

Optional

Vout X

Optional

Vout Y

DIRECTION OF THE

DETECTABLE

ACCELERATIONS

X

13

Y

1

Z

Digital signals

Power supply decoupling capacitors (100nF ceramic or polyester + 10µF Aluminum) should be

placed as near as possible to the device (common design practice).

The LIS3L02AS5 allows to band limit Voutx, Vouty and Voutz through the use of external

capacitors. The re-commended frequency range spans from DC up to 1.5 KHz. In particular,

capacitors must be added at output pins to implement low-pass filtering for antialiasing and

noise reduction. The equation for the cut-off frequency (ft) of the external filters is:

ft = 2----π----⋅------R----o---u----t---⋅----1-C-----l-o---a----d---(--x---,---y--,---z----)

Taking in account that the internal filtering resistor (Rout) has a nominal value equal to 110kΩ,

the equation for the external filter cut-off frequency may be simplified as follows:

ft

=

----------1---.--4---5----µ---F-----------

Cload(x, y, z)

[H

z]

The tolerance of the internal resistor can vary typically of ±20% within its nominal value of

110kΩ; thus the cut-off frequency will vary accordingly. A minimum capacitance of 320pF for

Cload(x, y, z) is required in any case.

10/14

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