L3G4200D

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Doc ID 17116 Rev 1

13/24

3.1

Terminology

3.1.1

Sensitivity

An angular rate gyroscope is device that produces a positive-going digital output for

counterclockwise rotation around the sensible axis considered. Sensitivity describes the

gain of the sensor and can be determined by applying a defined angular velocity to it. This

value changes very little over temperature and time.

3.1.2

Zero-rate level

Zero-rate level describes the actual output signal 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 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 time.

3.1.3

Self-test

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. When the ST is activated by IC,

an actuation force is applied to the sensor, emulating a definite Coriolis force. In this case

the sensor output will exhibit an output change.

3.2

Soldering information

It is qualified for soldering heat resistance according to JEDEC J-STD-020.

Leave “Pin 1 Indicator” unconnected during soldering.

Land pattern and soldering recommendations are available at www.st.com/mems.