Obsolete Product(s) - Obsolete Product(s)
Application hints LIS3L06AL
10/17
4 Application hints
Figure 3. LIS3L06AL 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 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 (f
t
) of the external filters is:
Taking in account that the internal filtering resistor (R
out
) has a nominal value equal to
110kΩ, 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
110kΩ; thus the cut-off frequency will vary accordingly. A minimum capacitance of 1nF for
C
load
(x, y, z) is required in any case.
.
Table 5. Filter Capacitor Selection, C
load
(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
1
Y
X
Z
Digital signals
Vout Z
Cload z
Optional
Vout X
100nF
Cload x
LIS3L06AL
10µF
Vdd
Vout Y
GND GND
Cload y
(top view)
Optional
Optional
GND
ST
FS
f
t
1
2π R
out
C
load
xyz,,()
⋅⋅
--------------------------------------------------------------------=
f
t
1.45µF
C
load
xyz,,()
------------------------------------- H z[]=
