Projected sensor design

AN4313

8/15

DocID024816 Rev 1

Figure 4. Two-layer implementation

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).

d

1/4L

1/4L

1/2L

L

Rx

Tx

panel

PCB

0.2 to 0.5 mm

H sensor (cross section)

bottom

MS18986V3

L

Between 1/8 L

and 1/16 L