LIS2L02AL datasheet(10/17 Pages) STMICROELECTRONICS

10 / 17 page

Application hints

LIS2L02AL

10/17

Application hints

Figure 3.

LIS2L02AL Electrical connection

Power supply decoupling capacitors (100nF ceramic or polyester + 10

µF Aluminum) should

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

The LIS2L02AL allows to band limit Voutx and Vouty through the use of external capacitors.

The re-commended frequency range spans from DC up to 2.0KHz. 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:

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 1nF for

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

Table 5.

Filter capacitor selection, Cload (x,y)

Cut-off frequency

Capacitor value

1 Hz

1500 nF

10 Hz

150 nF

20 Hz

68 nF

50 Hz

30 nF

100 Hz

15 nF

200 Hz

6.8 nF

500 Hz

3 nF

Vout X

100nF

Cload x

LIS2L02AL

10µF

Vdd

Vout Y

GND

Cload y

(top view)

Optional

Digital signals

DIRECTION OF THE

DETECTABLE

ACCELERATIONS

GND

π R

out

load

()

⋅⋅

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

1.45

µF

load

()

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

[]

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