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LIS244ALHTR Datasheet(PDF) 12 Page - STMicroelectronics

Part No. LIS244ALHTR
Description  MEMS inertial sensor high performance 2-axis 짹2/짹6g ultracompact linear accelerometer
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LIS244ALHTR Datasheet(HTML) 12 Page - STMicroelectronics

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Application hints
LIS244ALH
12/16
4
Application hints
Figure 3.
LIS244ALH electrical connection
Power supply decoupling capacitors (100 nF ceramic or polyester + 10 µF Aluminum)
should be placed as near as possible to the device (common design practice).
The LIS244ALH allows to band limit VoutX and VoutY through the use of external
capacitors. The recommended frequency range spans from DC up to 2.0 KHz. In particular,
capacitors are added at output VoutX and VoutY pins to implement low-pass filtering for
antialiasing and noise reduction. The equation for the cut-off frequency (ft) of the external
filters is in this case:
Taking into account that the internal filtering resistor (Rout) has a nominal value equal to
110 K
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
110 K
Ω; thus the cut-off frequency will vary accordingly. A minimum capacitance of 1 nF for
Cload(x, y) is required.
Digital signals
LIS244ALH
(top view)
(TOP VIEW)
DIRECTIONS OF THE
DETECTABLE
ACCELERATIONS
Y
1
X
ST
GND
1
4
9
12
Vdd
GND
GND
100nF
10µF
Vout y
Cload Y
Vout x
Cload X
5
16
2
3
67
8
10
11
15
14
13
FS
Pin 1 indicator
Optional
Optional
f
t
1
2
π R
out
C
load xy
,
()
⋅⋅
-----------------------------------------------------------------
=
f
t
1.45
µF
C
load xy
,
()
------------------------------- Hz
[]
=


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