LIS2L02AS4 datasheet(7/14 Pages) STMICROELECTRONICS

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LIS2L02AS4

Application hints

Figure 4. LIS2L02AS4 Electrical Connection

Power supply decoupling capacitors (100nF ceramic + 10

µF Al) should be placed as near as possible to

the device (common design practice).

The LIS2L02AS4 allows to band limit Voutx, Vouty through the use of external capacitors. The recom-

mended 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 fre-

quency (ft) of the external filters is:

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

Ω, the equation

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

The tolerance of the internal resistor can vary typically of ±20% within its nominal value of 110k

Ω; thus the

cut-off frequency will vary accordingly. A minimum capacitance of 320 pF for Cload(x, y) is required in any

case.

100nF

µF

Vdd

Vout X

GND

Cload x

Cload y

Optional

Vout Y

Digital signals

LIS2L02AS4

(top view)

DIRECTION OF THE

DETECTABLE

ACCELERATIONS

GND

π R

out

load xy

()

⋅⋅

----------------------------------------------------------------

1.45

µF

load xy

()

------------------------------- Hz

[]

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