Front Panel

AN3150

22/25

DocID17048 Rev 3

6

Front Panel

Each material type is defined with a dielectric permittivity constant, known as epsilon (

The higher

between the electrodes and the finger.

same threshold).

Equation 2

Example

with 0.5 mm of pressure sensitive adhesive (

Note that the total distance between the finger and the electrode has increased due to the

good dielectric performance of the glass panel.

Figure 17. Influence of panel on detection distance

⁄

()

–

=

Detection range

PCB

Electrode copper

Glue

Non conductive panel