AN4313 Datasheet, PDF (8/15 Pages) STMicroelectronics – Guidelines for designing touch sensing applications Guidelines for designing touch sensing applications

Projected sensor design
Figure 4. Two-layer implementation
L
1/2L
AN4313
L
1/ 4L
Tx
0.2 to 0.5 mm
1 / 4L
Between 1/8 L
and 1/16 L
Rx
panel _d
PCB
H sensor (cross section)
bottom
MS18986V3
2.2
Linear sensor
An example of a linear sensor with five parcels is described in Figure 5. This kind of linear
touch sensor is fine when each parcel is about 6 mm to 10 mm and it could have N parcels.
So, for an overall length L, you can calculate the parcel number: N = L / parcel size (adjust
the parcel size to obtain N as an integer).
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