LIS344ALH_0804 datasheet(12/19 Pages) STMICROELECTRONICS

12 / 19 page

Application hints

LIS344ALH

12/19

Application hints

Figure 3.

LIS344ALH 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 LIS344ALH allows to band limit VoutX, VoutY and VoutZ through the use of external

capacitors. The recommended frequency range spans from DC up to 1.8 kHz. In particular,

capacitors are added at output VoutX, VoutY, VoutZ 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, z) is required.

Digital signals

LIS344ALH

(top view)

(TOP VIEW)

DIRECTIONS OF THE

DETECTABLE

ACCELERATIONS

GND

Vdd

GND

100nF

10µF

Vout y

Cload Y

Vout x

Cload X

Vout z

Cload Z

Optional

Pin 1 indicator

Optional

π R

out

load xy

()

⋅⋅

-------------------------------------------------------------------------

1.45

µF

load xy

()

--------------------------------------- Hz

[]

LIS344ALH_0804 Datasheet(PDF) 12 Page - STMicroelectronics

LIS344ALH_0804 Datasheet(HTML) 12 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Datasheet Download

Link URL