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PDF LIS3LV02DL Data sheet ( Hoja de datos )

Número de pieza LIS3LV02DL
Descripción MEMS INERTIAL SENSOR
Fabricantes STMicroelectronics 
Logotipo STMicroelectronics Logotipo



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LIS3LV02DL
MEMS INERTIAL SENSOR
3-Axiswww.datasheet4u.com - ±2g/±6g Digital Output Low Voltage Linear Accelerometer
PRELIMINARY DATA
Features
2.16V to 3.6V single supply operation
1.8V compatible IOs
I2C/SPI digital output interfaces
Programmable 12 or 16 bit data representation
Interrupt activated by motion
Programmable interrupt threshold
Embedded self test
High shock survivability
ECOPACK® compliant (see Section 8)
Description
The LIS3LV02DL is a three axes digital output
linear accelerometer that includes a sensing
element and an IC interface able to take the
information from the sensing element and to
provide the measured acceleration signals to the
external world through an I2C/SPI serial interface.
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 instead is manufactured using a
CMOS process that allows high level of integration
to design a dedicated circuit which is factory
trimmed to better match the sensing element
characteristics.
LGA-16
The LIS3LV02DL has a user selectable full scale
of ±2g, ±6g and it is capable of measuring
acceleration over a bandwidth of 640 Hz for all
axes. The device bandwidth may be selected
accordingly to the application requirements. A
self-test capability allows the user to check the
functioning of the system
The device may be configured to generate an
inertial wake-up/free-fall interrupt signal when a
programmable acceleration threshold is crossed
at least in one of the three axes.
The LIS3LV02DL is available in plastic SMD
package and it is specified over a temperature
range extending from -40°C to +85°C.
The LIS3LV02DL belongs to a family of products
suitable for a variety of applications:
Free-Fall detection
Motion activated functions in portable terminals
Antitheft systems and Inertial navigation
Gaming and Virtual Reality input devices
Vibration Monitoring and Compensation
Order codes
Part number
LIS3LV02DL
LIS3LV02DL-TR
Op. Temp. range, °C
-40 to +85
-40 to +85
Package
LGA-16
LGA-16
Packing
Tray
Tape and Reel
February 2006
Rev 1
This is a preliminary information on a product now in development or undergoing evaluation. Details are subject to change without notice.
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www.st.com
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LIS3LV02DL pdf
LIS3LV02DL
Block Diagram & Pin Description
Table 1. Pin description
Pin#
Name
www.datasheet4u.com
1
2
RDY/INT
SDO
SDA/
3 SDI/
SDO
4 Vdd_IO
5 SCL/SPC
6 CS
7 NC
8 CK
9 GND
10 Reserved
11 Vdd
12 Reserved
13 Vdd
14 GND
15 Reserved
16 GND
Function
Data ready/inertial wake-up interrupt
SPI Serial Data Output
I2C Serial Data (SDA)
SPI Serial Data Input (SDI)
3-wire Interface Serial Data Output (SDO)
Power supply for I/O pads
I2C Serial Clock (SCL)
SPI Serial Port Clock (SPC)
SPI enable
I2C/SPI mode selection (1: I2C mode; 0: SPI enabled)
Internally not connected
Optional External clock, if not used either leave unconnected or
connect to GND
0V supply
Either leave unconnected or connect to Vdd_IO
Power supply
Connect to Vdd
Power supply
0V supply
Either leave unconnected or connect to GND
0V supply
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LIS3LV02DL arduino
LIS3LV02DL
3 Functionality
Functionality
www.datasheet4u.comThe LIS3LV02DL is a high performance, low-power, digital output 3-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 a signal to the
external world through an I2C/SPI serial interface.
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 up to 100fF.
3.2 IC Interface
The complete measurement chain is composed by a low-noise capacitive amplifier which
converts into an analog voltage the capacitive unbalancing of the MEMS sensor and by three
Σ∆ analog-to-digital converters, one for each axis, that translate the produced signal into a
digital bitstream.
The Σ∆ converters are coupled with dedicated reconstruction filters which remove the high
frequency components of the quantization noise and provide low rate and high resolution digital
words.
The charge amplifier and the Σ∆ converters are operated respectively at 61.5 kHz and 20.5
kHz.
The data rate at the output of the reconstruction depends on the user selected Decimation
Factor (DF) and spans from 40 Hz to 2560 Hz.
The acceleration data may be accessed through an I2C/SPI interface thus making the device
particularly suitable for direct interfacing with a microcontroller.
The LIS3LV02DL features a Data-Ready signal (RDY) which indicates when a new set of
measured acceleration data is available thus simplifying data synchronization in digital system
employing the device itself.
The LIS3LV02DL may also be configured to generate an inertial Wake-Up, Direction Detection
and Free-Fall interrupt signal accordingly to a programmed acceleration event along the
enabled axes.
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