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PDF LIS302SG Data sheet ( Hoja de datos )
| Número de pieza | LIS302SG | |
| Descripción | MEMS motion sensor | |
| Fabricantes | STMicroelectronics | |
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LIS302SG
MEMS motion sensor
3-axis - ±2g analog output "piccolo" accelerometer
Features
■ Single voltage supply operation
■ ~2 mW power consumption
■ ±2 g full-scale
■ 3 acceleration channels plus multiplexed
analog output
■ Ratiometric output voltage
■ Power-down mode
■ Embedded self-test
■ 10000 g high shock survivability
■ ECOPACK® RoHS and “Green” compliant
(see Section 6)
Description
The LIS302SG is a miniaturized low-power three-
axis linear accelerometer belonging to the
“piccolo” family of ST motion sensors. It includes
a sensing element and an IC interface 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 motion
sensors and actuators in silicon.
The IC interface is manufactured using a CMOS
process that allows to design a dedicated circuit
which is trimmed to better match the sensing
element characteristics.
The LIS302SG has a full scale of ±2 g and it is
capable of measuring accelerations over a
LGA-14 (3x5x0.9mm)
maximum bandwidth of 2.0 kHz. The device
bandwidth may be reduced by using external
capacitances. The self-test capability allows the
user to check the functioning of the sensor in the
final application.
The device has three analog acceleration output
plus an embedded multiplexer that allows to
redirect the analog outputs onto a single pin for
operation with a single channel A/D converter.
The LIS302SG is available in plastic Thin Land
Grid Array package (TLGA) and it is guaranteed
to operate over an extended temperature range
from -40 °C to +85 °C.
The LIS302SG belongs to a family of products
suitable for a variety of applications, including:
– Mobile terminals
– Gaming and virtual reality input devices
– Free-fall detection for data protection
– Antitheft systems and inertial navigation
– Appliance and robotics.
Table 1. Device summary
Order codes
Temperature range [°C]
LIS302SG
-40 to +85
LIS302SGTR
-40 to +85
Package
LGA-14
LGA-14
Packing
Tray
Tape and reel (16mm, pitch 8mm)
March 2008
Rev 1
1/19
www.st.com
19
1 page  
LIS302SG
Block diagram and pin description
1 Block diagram and pin description
Figure 1. Block diagram
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X+
Y+
CHARGE
AMPLIFIER
Z+
Routx
S/H
Voutx
a MUX
Z-
DEMUX
Routy
S/H
Vouty
Y-
X-
Routz
Voutz
S/H
Vout
MUX
SELF-TEST
REFERENCE
TRIMMING CIRCUIT
CLOCK
Aux_in S1 S0
1.1 Pin description
Figure 2. Pin connection
Z
X1
Y
(TOP VIEW)
DIRECTIONS OF
DETECTABLE
ACCELERATIONS
Vdd
Aux_in
Vout
GND
Voutz
Vouty
13
8
1 Reserved
Reserved
S0
S1
ST
6 PD
(BOTTOM VIEW)
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5 Page 
LIS302SG
Functionality
3 Functionality
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The LIS302SG is a “piccolo” 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. The sensor provides the three accelerations and one
multiplexed analog output.
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.
The device provides an embedded multiplexer to allow the redirection of either the analog
output signals Voutx, Vouty, and Voutz or of an auxiliary input signal onto a single pin for
operation with a single channel A/D converter.
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 in 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.
11/19
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