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PDF LIS2L02AS4 Data sheet ( Hoja de datos )
| Número de pieza | LIS2L02AS4 | |
| Descripción | MEMS INERTIAL SENSOR | |
| Fabricantes | STMicroelectronics | |
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LIS2L02AS4
MEMS INERTIAL SENSOR:
2-Axis - ±2g/±6g LINEAR ACCELEROMETER
1 Features
■ 2.4V TO 5.25V SINGLE SUPPLY OPERATION
■ LOW POWER CONSUMPTION
■ ±2g/±6g USER SELECTABLE FULL-SCALE
■ 0.3mg RESOLUTION OVER 100Hz
BANDWIDTH
■ EMBEDDED SELF TEST AND POWER DOWN
■ OUTPUT VOLTAGE, OFFSET AND
SENSITIVITY RATIOMETRIC TO THE
SUPPLY VOLTAGE
■ HIGH SHOCK SURVIVABILITY
■ LEAD FREE AND ECOPACK COMPATIBLE
2 Description
The LIS2L02AS4 is a low-power two axes 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
signalwww.DataSheet4U.com to the external world.
The sensing element, capable of detecting the ac-
celeration, is manufactured using a dedicated pro-
cess 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
to design a dedicated circuit which is trimmed to
better match the sensing element characteristics.
The LIS2L02AS4 has a user selectable full scale
Figure 1. Package
SO-24
Table 1. Order Codes
Part Number
E-LIS2L02AS4
Package
SO24
E-LIS2L02AS4TR SO24
Finishing
Tube
Tape & Reel
of ±2g, ±6g and it is capable of measuring acceler-
ations over a bandwidth of 1.5kHz for all axes. The
device bandwidth may be reduced by using exter-
nal capacitances. A self-test capability allows to
check the mechanical and electrical signal path of
the sensor.
The LIS2L02AS4 is available in plastic SMD pack-
age and it is specified over an extended tempera-
ture range of -40°C to +85°C.
The LIS2L02AS4 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
Figure 2. Block Diagram
X+
Y+
CHARGE
AMPLIFIER
S/H
Routx Voutx
a MUX
Y-
X-
DEMUX
S/H
Routy Vouty
SELF TEST
REFERENCE
TRIMMING CIRCUIT
December 2005
CLOCK
Rev. 2
1/14
1 page  
LIS2L02AS4
3.1 Terminology
3.1.1 Sensitivity
Describes the gain of the sensor and can be determined by applying 1g acceleration to it. As the sensor
can measure DC accelerations this can be done easily by pointing the axis of interest towards the center
of the earth, note the output value, rotate the sensor by 180 degrees (point to the sky) and note the output
value again thus applying ±1g acceleration to the sensor. Subtracting the larger output value from the
smaller one and dividing the result by 2 will give the actual sensitivity of the sensor. This value changes
very little over temperature (see sensitivity change vs. temperature) and also very little over time. The Sen-
sitivity Tolerance describes the range of Sensitivities of a large population of sensors.
3.1.2 Zero-g level
Describes the actual output signal if there is no acceleration present. A sensor in a steady state on an
horizontal surface will measure 0g in X axis and 0g in Y axis whereas the Z axis will measure +1g. The
output is ideally for a 3.3V powered sensor Vdd/2 = 1650mV. A deviation from ideal 0-g level (1650mV in
this case) is called Zero-g offset. Offset of precise MEMS sensors is to some extend a result of stress to
the sensor and therefore the offset can slightly change after mounting the sensor onto a printed circuit
board or exposing it to extensive mechanical stress. Offset changes little over temperature - see "Zero-g
Level Change vs. Temperature" - the Zero-g level of an individual sensor is very stable over lifetime. The
Zero-g level tolerance describes the range of zero-g levels of a population of sensors.
3.1.3 Self Test
Self Test allows to test the mechanical and electric part of the sensor, allowing the seismic mass to be
moved by means of an electrostatic test-force. The Self Test function is off when the ST pin is connected
to GND. When the ST pin is tied at Vdd an actuation force is applied to the sensor, simulating a definite
input acceleration. In this case the sensor outputs will exhibit a voltage change in their DC levels which is
related to the selected full scale and depending on the Supply Voltage through the device sensitivity.
When ST is activated, the device output level is given by the algebraic sum of the signals produced by the
acceleration acting on the sensor and by the electrostatic test-force. If the output signals change within
the amplitude specified inside Table 3, than the sensor is working properly and the parameters of the in-
terface chip are within the defined specification.
3.1.4 Output impedance
Describes the resistor inside the output stage of each channel. This resistor is part of a filter consisting of
an external capacitor of at least 320pF and the internal resistor. Due to the high resistor level only small,
inexpensive external capacitors are needed to generate low corner frequencies. When interfacing with an
ADC it is important to use high input impedance input circuitries to avoid measurement errors. Note that
the minimum load capacitance forms a corner frequency beyond the resonance frequency of the sensor.
For a flat frequency response a corner frequency well below the resonance frequency is recommended.
In general the smallest possible bandwidth for an particular application should be chosen to get the best
results.
5/14
5 Page 
6.3 Electrical Characteristics at 25°C
Figure 14. Noise density at 3.3V
35
30
25
20
15
10
5
0
18 20 22 24 26 28 30 32
Noise density (ug/sqrt(Hz))
Figure 15. Current consumption at 3.3V
20
18
16
14
12
10
8
6
4
2
0
0.4 0.6 0.8 1 1.2
current consumption (mA)
1.4
LIS2L02AS4
Figure 16. Current consumption in power
down mode at 3.3V
30
25
20
15
10
5
0
1.2 1.3 1.4 1.5 1.6 1.7 1.8
current consumption (uA)
11/14
11 Page | ||
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| PDF Descargar | [ Datasheet LIS2L02AS4.PDF ] | |
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