LIS2L02AL(2005) データシートの表示（PDF） - STMicroelectronics

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LIS2L02AL
(Rev.:2005)

MEMS INERTIAL SENSOR: 2-axis - +/-2g ULTRACOMPACT LINEAR ACCELEROMETER

STMicroelectronics 

4 Application hints

4 Application hints

LIS2L02AL

Figure 3. LIS2L02AL Electrical Connection

Vdd

10µF 100nF

GND GND

ST

GND

LIS2L02AL

(top view)

Cload y

Cload x

Digital signals

Optional

Vout Y

X

1

Optional

Vout X

Y

DIRECTION OF THE

DETECTABLE

ACCELERATIONS

Power supply decoupling capacitors (100nF ceramic or polyester + 10µF Aluminum) should be

placed as near as possible to the device (common design practice).

The LIS2L02AL allows to band limit Voutx and Vouty through the use of external capacitors.

The re-commended frequency range spans from DC up to 2.0KHz. 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)

Taking in account that the internal filtering resistor (Rout) has a nominal value equal to 110 kΩ,

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

ft = -C----l1-o---.-a4---d-5--(-µ--x--F,----y---)-[Hz]

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 723 pF for

Cload(x, y) is required in any case.

10/17

CD00068420

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