LIS3L06AL_06 datasheet(10/17 Pages) STMICROELECTRONICS

10 / 17 page

Application hints

LIS3L06AL

10/17

Application hints

Figure 3.

LIS3L06AL 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 LIS3L06AL 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:

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, z) is required in any case.

Table 5.

Filter Capacitor Selection, Cload (x,y,z)

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

DIRECTION OF THE

DETECTABLE

ACCELERATIONS

Digital signals

Vout Z

Cload z

Optional

Vout X

100nF

Cload x

LIS3L06AL

10µF

Vdd

Vout Y

GND

Cload y

(top view)

Optional

GND

π R

out

load

xyz

()

⋅⋅

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

1.45

µF

load

xyz

()

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

[]

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