Espressif ESP32--S3 Series, Hardware Design Manuallines

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CONFIDENTIAL
3 PCB Layout Design
Protective cover
Substrate
Electrode
C
ESP CHIP
Figure 22: A Typical Touch Sensor Application
In order to prevent capacitive coupling and other electrical interference to the sensitivity of the touch sensor
system, the following factors should be taken into account.
3.9.1 Electrode Pattern
The proper size and shape of an electrode improves system sensitivity. Round, oval, or shapes similar to a
human fingertip are commonly applied. Large size or irregular shape might lead to incorrect responses from
nearby electrodes.
Figure 23: Electrode Pattern Requirements
Note:
The examples illustrated in Figure 23 are not of actual scale. It is suggested to use a human fingertip as reference.
3.9.2 PCB Layout
Figure 24 illustrates the general guidelines to routing traces.
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ESP32-S3 Series Hardware Design Guidelines v1.0