LIS3L02DQ STMicroelectronics, LIS3L02DQ Datasheet - Page 5

• Manufacturer Part Number: LIS3L02DQ
• Description: ACCELEROMETER TRPL AXIS 44QFN
• Manufacturer: STMicroelectronics

Specifications of LIS3L02DQ

• Axis: X, Y, Z
• Acceleration Range: ±2g
• Sensitivity: 1024 LSb/g
• Voltage - Supply: 2.7 V ~ 3.6 V
• Output Type: Digital
• Bandwidth: 1.5kHz
• Interface: I²C, SPI
• Mounting Type: Surface Mount
• Package / Case: 44-QFN
• Sensing Axis: X, Y, Z
• Acceleration: 2 g
• Digital Output - Number Of Bits: 12 bit
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.7 V
• Supply Current: 1 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: - 20 C
• Digital Output - Bus Interface: I2C, SPI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-4129; LIS3L02DQ; Q2094276

LIS3L02DQ
3.1 Terminology
3.1.1 Sensitivity
Sensitivity describes the gain of the sensor and can be determined e.g. by applying 1g acceleration to it.
As the sensor can measure DC accelerations this can be done easily by pointing the axis of interest to-
wards 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. By doing so, ±1g acceleration is applied to the sensor. Subtracting the
larger output value from the smaller one and divide the result by 2 leads to the actual sensitivity of the
sensor. This value changes very little over temperature (see sensitivity temperature change) and also very
little over time. The Sensitivity Tolerance describes the range of Sensitivities of a large population of sen-
sors.
3.1.2 Zero g level
Zero-g level (Offset) describes the deviation of an actual output signal from the ideal 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 in the middle of the dynamic
range of the sensor (0000 0000 0000). A deviation from this value is called zero-g offset; the coding is
based two's complement. Offset is to some extend a result of stress to a precise MEMS sensor and there-
fore 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. temper-
ature”. The Zero-g level of an individual sensor is very stable over lifetime. The Zero g level tolerance de-
scribes the range of zero g levels of a population of sensors.
3.1.3 Self Test
Self Test allows to test the mechanical and electrical part of the sensor. By applying a digital code via the
serial interface to the sensor an internal reference is switched to a certain area of the sensor and creates
a defined deflection of the moveable structure. The sensor will generate a defined signal and the interface
chip will perform the signal conditioning. If the output signal changes within the specified amplitude than
the sensor is working properly and the parameters of the interface chip are within tolerance. Self Test
changes linearly with power supply.
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