LIS3L02AS4 datasheet(7/14 Pages) STMICROELECTRONICS

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LIS3L02AS4

Application Hints

Figure 4. LIS3L02AS4 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 LIS3L02AS4 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 ( ) of the external filters is:

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

, the equa-

tion 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, z) is required in

any case.

Vout Z

100nF

Cload z

LIS3L02AS4

µF

Vdd

Vout X

GND

Cload x

Cload y

(top view)

Optional

Vout Y

Optional

Digital signals

DIRECTION OF THE

DETECTABLE

ACCELERATIONS

GND

π R

out

load xyz

()

⋅⋅

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

110k

Ω

1.45

µF

load xy

()

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

[]

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