LIS2L02AQ3 데이터 시트보기 (PDF) - STMicroelectronics
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LIS2L02AQ3 Datasheet PDF : 17 Pages
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4 Application hints
4 Application hints
Figure 3. LIS2L02AQ3 Electrical Connection
Vdd
44
Vdd
34
10µF 100nF
GND GND
1
GND
ST
LIS2L02AQ3
(top view)
11
33
GND
GND
23res
12
22
LIS2L02AQ3
1
Y
X
Cload x
Cload y
Optional
Vout X
Optional
Vout Y
DIRECTION OF THE
DETECTABLE
ACCELERATIONS
Digital signals
Power supply decoupling capacitors (100nF ceramic or polyester + 10µF Aluminum) should be
placed as near as possible to the device (common design practice).
The LIS2L02AQ3 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:
ft
=
-------------------------------1--------------------------------
2π ⋅ Rout ⋅ Cload(x, y, z)
Taking into account that the internal filtering resistor (Rout) has a nominal value equal to
110kOhm, the equation for the external filter cut-off frequency may be simplified as follows:
ft
=
--------1----.-4----5----µ---F-----------
Cload(x, y, 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
Cf(x, y, z) is required in any case.
10/17
CD00059664
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