DocID17048 Rev 3

17/25

AN3150

Proximity sensing electrode design

24

4.2.1

test description

The dielectric thickness (T) between the electrode and GND plane varies form 0.2mm to

1.6mm (see Figure 10.).

Figure 10. Dielectric thickness

For each dielectric thickness, different electrode size from 50mm² to 250mm² have been

tested (see Figure 11.)

Figure 11. Test boards surfaces

MS31255V1

T

Epoxy

Sensing area

Electrode

GND plane

T (mm) = 0.2, 0.6, 0.8, 1, 1.2, 1.4, 1.6

MS31256V1

50 mm

2

100 mm

2

150 mm

2

200 mm

2

250 mm

2