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PDF LIS344ALH Data sheet ( Hoja de datos )

Número de pieza LIS344ALH
Descripción MEMS inertial sensor
Fabricantes STMicroelectronics 
Logotipo STMicroelectronics Logotipo



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No Preview Available ! LIS344ALH Hoja de datos, Descripción, Manual

LIS344ALH
MEMS inertial sensor
www.datashheeit4guh.comperformance 3-axis ±2/±6g ultracompact linear accelerometer
Features
2.4 V to 3.6 V single supply operation
±2 g / ±6 g user selectable full-scale
Low power consumption
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 ( 10000 g )
Description
The LIS344ALH 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 an ST
proprietary CMOS process with high level of
integration. The dedicated circuit is trimmed to
better match the sensing element characteristics.
LGA 16 (4x4x1.5 mm)
The LIS344ALH has a dynamically user
selectable full-scale of ±2 g / ±6 g and it is
capable of measuring accelerations over a
maximum bandwidth of 1.8 kHz for all axes. The
device bandwidth may be reduced by using
external capacitances. The self-test capability
allows the user to check the functioning of the
system.
The LIS344ALH is available in Land Grid Array
package (LGA) manufactured by ST.
It is guaranteed to operate over an extended
temperature range of -40 °C to +85 °C.
The LIS344ALH 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 codes
Temp range [° C]
LIS344ALH
-40 to +85
LIS344ALHTR
-40 to +85
Package
LGA-16
LGA-16
Packaging
Tray
Tape and reel
February 2008
Rev 2
1/16
www.st.com
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1 page




LIS344ALH pdf
LIS344ALH
Block diagram and pin description
1 Block diagram and pin description
1.1
www.datasheet4u.com
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
16
1 FS
ST
NC
4 Res
5
(BOTTOM VIEW)
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LIS344ALH arduino
LIS344ALH
3 Functionality
Functionality
www.datasheet4u.com
The LIS344ALH is an ultra compact low-power, analog output three-axis linear
accelerometer packaged in a LGA package. The complete device 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.
3.1 Sensing element
A proprietary process is used to create a surface micro-machined accelerometer. The
technology allows to carry out suspended silicon structures which are attached to the
substrate in a few points called anchors and are free to move in the direction of the sensed
acceleration. To be compatible with the traditional packaging techniques a cap is placed on
top of the sensing element to avoid blocking the moving parts during the moulding phase of
the plastic encapsulation.
When an acceleration is applied to the sensor the proof mass displaces from its nominal
position, causing an imbalance in the capacitive half-bridge. This imbalance is measured
using charge integration in response to a voltage pulse applied to the sense capacitor.
At steady state the nominal value of the capacitors are few pF and when an acceleration is
applied the maximum variation of the capacitive load is in the fF range.
3.2 IC interface
The complete signal processing uses a fully differential structure, while the final stage
converts the differential signal into a single-ended one to be compatible with the external
world.
The first stage is a low-noise capacitive amplifier that implements a Correlated Double
Sampling (CDS) at its output to cancel the offset and the 1/f noise. The produced signal is
then sent to three different S&Hs, one for each channel, and made available to the outside.
All the analog parameters (output offset voltage and sensitivity) are ratiometric to the
voltage supply. Increasing or decreasing the voltage supply, the sensitivity and the offset will
increase or decrease linearly. This feature provides the cancellation of the error related to
the voltage supply along an analog to digital conversion chain.
3.3 Factory calibration
The IC interface is factory calibrated for sensitivity (So) and Zero-g level (Voff).
The trimming values are stored inside the device by a non volatile structure. Any time the
device is turned on, the trimming parameters are downloaded into the registers to be
employed during the normal operation. This allows the user to employ the device without
further calibration.
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