LSM330DL datasheet(17/54 Pages) STMICROELECTRONICS

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LSM330DL

Module specifications

Doc ID 022018 Rev 1

17/54

2.6

Terminology

2.6.1

Sensitivity

Linear acceleration sensitivity can be determined by applying 1

g acceleration to the device.

As the sensor can measure DC accelerations, this can be done easily by pointing the axis of

interest towards the center of the Earth, noting the output value, rotating the sensor by 180

degrees (point to the sky) and then noting the output value again. By doing so, ±1

acceleration is applied to the sensor. Subtracting the larger output value from the smaller

one, and dividing the result by 2, leads to the actual sensitivity of the sensor. This value

changes very little over temperature and also very little over time. The sensitivity tolerance

describes the range of sensitivities of a large population of sensors.

Angular rate sensitivity describes the angular rate gain of the sensor and can be determined

by applying a defined angular velocity to it. This value changes very little over temperature

and also very little over time.

2.6.2

Zero level

Linear acceleration zero-

g level offset (TyOff) describes the deviation of an actual output

signal from the ideal output signal if no acceleration is present. A sensor in a steady state on

a horizontal surface will measure 0

g on the X-axis and 0 g on the Y-axis whereas the Z-axis

will measure 1

g. The output is ideally in the middle of the dynamic range of the sensor

(content of OUT registers 00h, data expressed as 2’s complement number). A deviation

from the ideal value in this case is called zero-

g offset. Offset is to some extent a result of

stress to the MEMS 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” (refer toTable 3).

The zero-

g level tolerance (TyOff) describes the standard deviation of the range of zero-g

levels of a population of sensors.

The angular rate zero-rate level describes the actual output value if there is no angular rate

present. Zero-rate level of precise MEMS sensors is, to some extent, a result of stress to the

sensor and therefore the zero-rate level can slightly change after mounting the sensor onto

a printed circuit board or after exposing it to extensive mechanical stress. This value

changes very little over temperature and also very little over time.

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