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PDF LIS344AL Data sheet ( Hoja de datos )
| Número de pieza | LIS344AL | |
| Descripción | MEMS inertial sensor | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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LIS344AL
MEMS inertial sensor
3-axis ultracompact linear accelerometer
Features
■ Single voltage supply operation
■ ±3.5g full-scale
■ Output voltage, offset and sensitivity are
ratiometric to the supply voltage
■ Factory trimmed device sensitivity and offset
■ Embedded self test
■ RoHS/ECOPACK® compliant
■ High shock survivability (10000g)
Description
The LIS344AL is an ultra compact consumer low-
power three-axis linear accelerometer that
includes a sensing element and an IC interface
able to take the information from the sensing
element and to provide an analog signal to the
external world.
The sensing element, capable of detecting the
acceleration, is manufactured using a dedicated
process developed by ST to produce inertial
sensors and actuators in silicon.
The IC interface is manufactured using a CMOS
process that allows high level of integration to
design a dedicated circuit which is trimmed to
better match the sensing element characteristics.
LGA 16 (4x4x1.5mm)
The LIS344AL is capable of measuring
accelerations over a maximum bandwidth of
2.0kHz. The device bandwidth may be reduced by
using external capacitances. A self-test capability
allows the user to check the functioning of the
system.
The LIS344AL is available in Land Grid Array
package (LGA) and it is guarantee to operate over
an extended temperature range of -40°C to
+85°C.
The LIS344AL belongs to a family of products
suitable for a variety of applications:
– Mobile terminals
– Gaming and virtual reality input devices
– Antitheft systems and inertial navigation
– Appliance and robotics.
Table 1. Device summary
Order code
Temp range, ° C
LIS344AL
-40°C to +85°C
LIS344ALTR
-40°C to +85°C
Package
LGA-16
LGA-16
Packing
Tray
Tape & Reel
December 2007
Rev 1
1/15
www.st.com
15
1 page  
LIS344AL
Block diagram and pins description
1 Block diagram and pins description
1.1
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Block diagram
Figure 1. Block diagram
X+
Y+ CHARGE
AMPLIFIER
Z+
Routx
S/H
VoutX
a MUX
Z-
DEMUX
Routy
S/H
VoutY
Y-
X-
Routz
VoutZ
S/H
SELF TEST
REFERENCE
TRIMMING CIRCUIT
CLOCK
1.2 Pin description
Figure 2. Pin connection
Z
1
Y
X
(TOP VIEW)
DIRECTIONS OF THE
DETECTABLE
ACCELERATIONS
13
VoutX 12
NC
VoutY
NC 9
8
Pin 1 Indicator
16
1 NC
ST
GND
4 NC
5
(BOTTOM VIEW)
5/15
5 Page 
LIS344AL
4 Application hints
Figure 3. LIS344AL electrical connection
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Application hints
ST
GND
GND GND
100nF 10µF
Vdd
Z
16 15 14 13
1 12
Cload X
2 LIS344AL 11
3 (top view) 10
Cload Y
49
5678
Cload Z
Optional
Optional
Optional
Vout x
Vout y
Vout z
1 Pin 1 indicator
Y
X
(TOP VIEW)
DIRECTIONS OF THE
DETECTABLE
ACCELERATIONS
Digital signals
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 LIS344AL allows to band limit VoutX, VoutY and VoutZ 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, 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:
ft
=
-----------------------------------1-------------------------------------
2π ⋅ Rout ⋅ Cload(x, y, z)
Taking into account that the internal filtering resistor (Rout) has a nominal value equal to 32
kΩ, the equation for the external filter cut-off frequency may be simplified as follows:
ft
=
---------------5---µ----F----------------
Cload(x, y, z)
[H
z
]
The tolerance of the internal resistor can vary typically of ±20% within its nominal value of 32
kΩ; thus the cut-off frequency will vary accordingly. A minimum capacitance of 2.5 nF for
Cload(x, y, z) is required.
11/15
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| PDF Descargar | [ Datasheet LIS344AL.PDF ] | |
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