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PDF ( 数据手册 , 数据表 ) LIS352AX

零件编号 LIS352AX
描述 Accelerometers
制造商 ST Microelectronics
LOGO ST Microelectronics LOGO 


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LIS352AX 数据手册, 描述, 功能
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LIS352AX
MEMS inertial sensor
3-axis - ±2g absolute analog output accelerometer
Preliminary Data
Features
Absolute 0-g level and sensitivity
Very high stability over temperature
3 acceleration channels plus multiplexed
analog output
Factory trimmed device sensitivity and
0-g level
Power-down mode
Embedded self test
10000g high shock survivability
ECOPACK® RoHS and “Green” compliant
(see Section 5)
Applications
Free-fall detection for data protection
Mobile and battery operated terminals
Gaming and virtual reality input devices
Antitheft systems and inertial navigation
Description
The LIS352AX is the new small size, low-power
three-axis linear accelerometer that includes a
sensing element and an IC interface able to
provide an absolute analog signal to the external
world.
The IC interface is manufactured using a CMOS
process that allows high level of integration to
LGA14 (3x5x0.9mm)
design a dedicated circuit which is trimmed to
better match the sensing element characteristics.
The LIS352AX has a full scale of ±2g and it is
capable of measuring accelerations over a
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 system.
An embedded multiplexer allows to redirect the
analog outputs onto a single pin for operation with
a single channel A/D converter.
ST is already in the field with several hundreds
million sensors with excellent acceptance from
the market in terms of quality, reliability and
performance.
The LIS352AX is provided in plastic land grid
array (LGA) package.
Several years ago ST pioneered successfully the
usage of this package for accelerometers. Today
ST has the widest manufacturing capability and
strongest expertise in the world for production of
sensor in plastic LGA package.
Table 1. Device summary
Order codes
Temperature range, ° C
LIS352AX
-40°C to +85°C
LIS352AXTR
-40°C to +85°C
Package
LGA-14
LGA-14
Packing
Tray
Tape and reel (16mm, pitch 0.8mm)
March 2009
Rev 1
This is preliminary information on a new 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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LIS352AX pdf, 数据表
Mechanical and electrical specifications
LIS352AX
2.4 Terminology
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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 Sensitivity tolerance describes the range of Sensitivities of a large population of
sensors.
Zero-g level describes the actual output signal if there is no acceleration present. A sensor
in a steady state on a horizontal surface will measure 0g in X axis and 0g in Y axis whereas
the Z axis will measure ±1g. A deviation from ideal 0-g level (1250mV 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.
Self test allows to test the mechanical and electrical 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. 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, then the sensor is working properly and the parameters of the
interface chip are within the defined specification.
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 2.5 nF and the internal
resistor. Due to the 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 close to the resonance frequency of the sensor. In
general the smallest possible bandwidth for a particular application should be chosen to get
the best results.
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