LIS2L02AL
MEMS INERTIAL SENSOR:
2-axis - +/-2g ultracompact linear accelerometer
Features
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■
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2.4V to 5.25V single supply operation
Low power consumption
±
2g full-scale
0.3mg resolution over 100Hz bandwidth
Embedded self test
Output voltage, offset and sensitivity
ratiometric to the supply voltage
High shock survivability
ECOPACK® Lead-free compliant
(see
Section 6)
LGA-8
to design a dedicated circuit which is trimmed to
better match the sensing element characteristics.
The LIS2L02AL has a full scale of
±
2g and it is
capable of measuring accelerations over a
bandwidth of 2.0 kHz for all axes. The device
bandwidth may be reduced by using external
capacitances. A self-test capability allows to
check the mechanical and electrical signal path of
the sensor.
The LIS2L02AL is available in plastic SMD
package and it is guaranteed to operate over an
extended temperature range of -40°C to +85°C.
The LIS2L02AL belongs to a family of products
suitable for a variety of applications:
– Mobile terminals
– Gaming and Virtual Reality input devices
– Free-fall detection for data protection
– Antitheft systems and Inertial Navigation
– Appliance and Robotics.
Description
The LIS2L02AL is a low-power 2-axis linear
capacitive 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 standard
CMOS process that allows high level of
integration
Order codes
Part number
LIS2L02AL
LIS2L02ALTR
Temp range,
°C
-40°C to +85°C
-40°C to +85°C
Package
LGA-8
LGA-8
Packing
Tray
Tape & Reel
May 2006
Rev 2
1/17
www.st.com
17
Contents
LIS2L02AL
Contents
1
Block diagram & pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
1.2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Mechanical and electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1
2.2
2.3
2.4
Mechanical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1
3.2
3.3
Sensing element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
IC Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Factory calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4
Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1
4.2
Soldering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Output response vs. orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1
5.2
5.3
Mechanical characteristics at 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Mechanical characteristics derived from measurement in the
-40°C to +85°C temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Electrical characteristics at 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6
7
Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17
LIS2L02AL
Block diagram & pins description
1
1.1
Block diagram & pins description
Block diagram
Figure 1.
Block diagram
X+
Y+
CHARGE
AMPLIFIER
S/H
Routx Voutx
a
Y-
X-
MUX
DEMUX
Routy Vouty
S/H
SELF TEST
REFERENCE
TRIMMING CIRCUIT
CLOCK
1.2
Pin description
Figure 2.
Pin connection
LIS2L02AL
Vdd
X
1
Voutx
Vouty
ST
NC
GND
Y
Reserved
DIRECTION OF THE
DETECTABLE
ACCELERATIONS
Reserved
BOTTOM VIEW
3/17
Block diagram & pins description
Table 1.
Pin #
1
2
3
4
5
6
7
8
LIS2L02AL
Pin description
Pin Name
ST
NC
GND
Reserved
Reserved
Vouty
Voutx
Vdd
Function
Self Test (Logic 0: normal mode; Logic 1: Self-test)
Not connected
0V supply
Leave unconnected
Leave unconnected
Output Voltage Y channel
Output Voltage X channel
Power supply
4/17
LIS2L02AL
Mechanical and electrical specifications
2
2.1
Table 2.
Mechanical and electrical specifications
Mechanical characteristics
Mechanical characteristics
(1)
(Temperature range -40°C to +85°C) All the parameters are specified @ Vdd =3.3V,
T = 25°C unless otherwise noted
Parameter
Acceleration Range
(3)
Sensitivity
(4)
Sensitivity Change Vs
Temperature
Zero-g Level
(4)
Zero-g level Change Vs
Temperature
Non Linearity
(5)
Full-scale = 2g
Delta from +25°C
T = 25°C
Delta from +25°C
Best fit straight line
Full-scale = 2g
X, Y axis
Vdd/2-6%
Test Condition
Min.
±1.8
Vdd/5–10%
Typ.
(2)
±2.0
Vdd/5
±0.01
Vdd/2
±0.2
Vdd/2+6%
Vdd/5+10%
Max.
Unit
g
V/g
%/°C
V
mg/°C
Symbol
Ar
So
SoDr
Voff
OffDr
NL
±0.3
±2
±1.5
±4
%
%
µg/
Hz
CrossAx Cross-Axis
(6)
An
Acceleration Noise
Density
Vdd=3.3V;
Full-scale = 2g
T = 25°C
Vdd=3.3V
Full-scale = 2g
X axis
T = 25°C
Vdd=3.3V
Full-scale = 2g
Y axis
30
-20
-50
-100
mV
Vt
Self test Output Voltage
Change
(7),(8)
20
50
100
mV
Fres
Top
Wh
Sensing Element
all axes
Resonance Frequency
(9)
Operating Temperature
Range
Product Weight
2.0
-40
0.08
+85
kHz
°C
gram
1. The product is factory calibrated at 3.3V. The device can be powered from 2.4V to 5.25V. Voff, So and Vt parameters will
vary with supply voltage.
2. Typical specifications are not guaranteed
3. Guaranteed by wafer level test and measurement of initial offset and sensitivity
4. Zero-g level and sensitivity are essentially ratiometric to supply voltage
5. Guaranteed by design
6. Contribution to the measuring output of the inclination/acceleration along any perpendicular axis
7. Self test “output voltage change” is defined as Vout
(Vst=Logic1)
-Vout
(Vst=Logic0)
8. Self test “output voltage change” varies cubically with supply voltage
9. Minimum resonance frequency Fres=2.0KHz. Sensor bandwidth=1/(2*π*110kΩ*Cload) with Cload>1nF.
5/17
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