LIS244AL データシートの表示（PDF） - STMicroelectronics

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LIS244AL

MEMS motion sensor: 2-axis - ±2g ultracompact linear accelerometer

STMicroelectronics 

Application hints

4

Application hints

Figure 3. LIS244AL Electrical connection

LIS244AL

ST

GND

GND

100nF

GND

10µF

16 15 14 13

1

12

2

LIS244AL

Cload x

11

(top view)

3

10

Cload y

4

9

5 678

Vdd

Optional

Optional

1 Pin 1 indicator

Vout x

X

Y

Vout y

(TOP VIEW)

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 LIS244AL allows to band limit Voutx, Vouty through the use of external capacitors. The

recommended frequency range spans from DC up to 2.0kHz. In particular, capacitors are

added at output Voutx, 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:

Equation 1

ft = -2---π-----⋅------R----o---u----t--⋅---1---C-----l-o---a----d---(--x---,-----y---)-

Taking into account that the internal filtering resistor (Rout) has a nominal value equal to

32kΩ, the equation for the external filter cut-off frequency may be simplified as follows:

Equation 2

ft = C-----l--o-5--a--µ-d--F-x---,-----y- [Hz]

10/15

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