LIS3L02AQ5 데이터 시트보기 (PDF) - STMicroelectronics

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LIS3L02AQ5

MEMS INERTIAL SENSOR: 3-axis - ±2g/±6g LINEAR ACCELEROMETER

STMicroelectronics 

LIS3L02AQ5

4 Application hints

4 Application hints

Figure 3. LIS3L02AQ5 Electrical Connection

Vdd

44

Vdd

34

10µF 100nF

GND GND

1

GND

ST

LIS3L02AQ5

(top view)

11

33

GND

GND

23res

12

22

Z

1

Y

X

Cload z

Cload x

Cload y

Optional

Vout Z

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 LIS3L02AQ5 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.

CD00059677

11/15

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