E-LIS2L02AS4TR View Datasheet(PDF) - STMicroelectronics
Part Name
Description
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E-LIS2L02AS4TR Datasheet PDF : 14 Pages
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5 Application hints
Figure 4. LIS2L02AS4 Electrical Connection
1
24
Vdd
2
23
3
22
10µF
GND
100nF
GND
GND
ST
4
21
5
20
6
19
LIS2L02AS4
7
18
8 (top view) 17
9
16
GND
10
15
11
14
PD
12
13
FS
Cload x
Cload y
Optional
Vout X
Optional
Vout Y
LIS2L02AS4
DIRECTION OF THE
DETECTABLE
ACCELERATIONS
X
13
Y
1
Digital signals
Power supply decoupling capacitors (100nF ceramic + 10µF Al) should be placed as near as possible to
the device (common design practice).
The LIS2L02AS4 allows to band limit Voutx, Vouty through the use of external capacitors. The recom-
mended 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 fre-
quency (ft) of the external filters is:
ft
=
-------------------------------1--------------------------------
2π ⋅ Rout ⋅ Cload(x, y)
Taking in account that the internal filtering resistor (Rout) has a nominal value equal to 110kΩ, the equation
for the external filter cut-off frequency may be simplified as follows:
ft
=
------1----.-4----5---µ----F--------
Cload(x, y)
[
H
z
]
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 320 pF for Cload(x, y) is required in any
case.
7/14
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