LIS302ALK datasheet(10/14 Pages) STMICROELECTRONICS

10 / 14 page

Application hints

LIS302ALK

10/14

Application hints

Figure 3.

LIS302ALK electrical Connection

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

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

The LIS302ALK allows to band limit Voutx, Vouty and Voutz through the use of external

capacitors. The recommended frequency range spans from DC up to 2.0kHz. 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:

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

32k

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

32k

Ω; thus the cut-off frequency will vary accordingly. A minimum capacitance of 2.5nF for

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

DIRECTION OF THE

DETECTABLE

ACCELERATIONS

Digital signals

Vout X

LIS302ALK

Vout Y

Cload y

Cload x

(top view)

Optional

Vout z

Optional

Cload z

100nF

μF

GND

Vdd

GND

Vdd

Pin 1 indicator

GND

π R

out Cload xy z

()

⋅⋅

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

μF

load xy z

()

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

[]

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