Combined implementation

AN3236

8/15

DocID17613 Rev 3

A channel can be connected to several double-ended electrodes which allows the number

of:

•

touchkeys to be doubled (very suitable for products with few channels)

•

GPIOs used for the touch sensing acquisition to be reduced.

Figure 3 gives an example of an implementation where six touchkeys are generated with

only three channels.

Figure 3. Example of an implementation for six touchkeys with only three channels