5.2

The embedded GestIC Library is optimized to ensure continuous and Real-Time Free-Space gesture recognition and

motion tracking concurrently. It is fully-configurable and allows required parametrization for individual application and

external electrodes.

5.3

External Rx Electrodes

Rx electrodes are connected to the MXG3141. An electrode needs to be individually designed following the guide

lines from AN2574, “2D3D Electrode Design Guide” (DS00002574), for optimal E-field distribution and detection of

E-field variations created by a user.

5.3.1

Electrode Equivalent Circuit

The gesture recognition capabilities of a GestIC system depend on the electrode design and their material

characteristics.

A simplified equivalent circuit model of a generic GestIC electrode system is illustrated in the following figure:

Figure 5-2. Electrodes Capacitive Equivalent Circuitry Earth Grounded

System ground

Transmitter signal

Electrode signal

Earth ground

E-field

System Ground

External Electrodes

Tx electrode voltage

MXG3141 Rx input voltage

Capacitance between receive electrode and hand (earth ground). The user’s hand can always be

considered as earth-grounded due to the comparable large size of the human body.

circuit

Rx electrode

Tx electrode

The Rx and Tx electrodes in a GestIC electrode system build a capacitance voltage divider with the capacitances

system ground driven by the Tx signal. The Rx electrode measures the potential of the generated E-field. If a

conductive object (e.g., a hand) approaches the Rx electrode, CH changes its capacitance. This minuscule change

MXG3141

System Architecture

Advance Information Datasheet

DS40001975C-page 13