LIS344ALTR STMicroelectronics, LIS344ALTR Datasheet - Page 9

• Manufacturer Part Number: LIS344ALTR
• Description: ACCELEROMETER TRPL AXIS 16-LGA
• Manufacturer: STMicroelectronics

Specifications of LIS344ALTR

• Axis: X, Y, Z
• Acceleration Range: ±3.5g
• Sensitivity: 0.100 x Vdd = V/g
• Voltage - Supply: 2.7 V ~ 3.3 V
• Output Type: Analog
• Bandwidth: 2kHz
• Interface: IC
• Mounting Type: Surface Mount
• Package / Case: 16-LGA
• Sensing Axis: X, Y, Z
• Acceleration: 3.5 g
• Supply Voltage (max): 3.3 V
• Supply Voltage (min): 2.7 V
• Supply Current: 0.69 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• For Use With: 497-8231 - EVALUATION BOARD FOR THE LIS344A497-8201 - BOARD ADAPTER LIS344AL DIL24497-8200 - BOARD DEMO LIS344AL497-8199 - BOARD DEMO LIS344ALH
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LIS344AL
2.4
Terminology
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. The output is ideally for a 3.0V powered sensor Vdd/2 = 1500
mV. A deviation from ideal 0-g level (1500 mV 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 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 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
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.
This is a Mechanical Shock sensitive device, improper handling can cause permanent
damages to the part
This is an ESD sensitive device, improper handling can cause permanent damages to
the part
3, then the sensor is working properly and the parameters of the interface chip are
Mechanical and electrical specifications
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