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PDF LIS331AL Data sheet ( Hoja de datos )
| Número de pieza | LIS331AL | |
| Descripción | MEMS inertial sensor | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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LIS331AL
MEMS inertial sensor:
3-axis - ±2g analog output “nano” accelerometer
Features
■ Single voltage supply operation
■ ±2.0g full-scale
■ Output voltage, offset and sensitivity are
ratiometric to the supply voltage
■ Factory trimmed device sensitivity and offset
■ Embedded self test
■ ECOPACK® lead-free compliant
■ High shock survivability (10000g)
Applications
■ Mobile terminals
■ Gaming and virtual reality input devices
■ Antitheft systems and Inertial Navigation
■ Appliance and robotics
Description
The LIS331AL is the smallest 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
LGA 16 (3x3x1.0mm)
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.
The LIS331AL 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 LIS331AL is available in Land Grid Array
package (LGA) and it is guaranteed to operate
over an extended temperature range of -40°C to
+85°C.
Table 1. Device summary
Order code
Temp range, ° C
LIS331AL
-40°C to +85°C
LIS331ALTR
-40°C to +85°C
Package
LGA-16
LGA-16
Note:
Tape & Reel parts are compliant to International Standard EIA-481.
Packing
Tray
Tape & Reel
September 2007
Rev 1
1/16
www.st.com
16
1 page  
LIS331AL
Block diagram & pins description
1 Block diagram & pins description
1.1
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Block diagram
Figure 1. Block diagram
X+
Y+ CHARGE
AMPLIFIER
Z+
Routx
S/H
a MUX
Z-
Y-
X-
DEMUX
Routy
S/H
Routz
S/H
SELF TEST
REFERENCE
ST
TRIMMING
CIRCUIT
CLOCK
Voutx
Vouty
Voutz
Pd
1.2 Pin description
Figure 2. Pin connection
1
X
Y
Z
(Top view)
Direction of the detectable
accelerations
13
Voutx
NC
Vouty
NC
Voutz
9
1
res
res
NC
ST
PD
5
(Bottom view)
5/16
5 Page 
LIS331AL
3 Functionality
Functionality
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The LIS331AL is a nano 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 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. The 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.
11/16
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LIS331AL.PDF ] | |
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