Espressif ESP32--S3 Series, Hardware Design Manuallines

Page: 26 / 33

CONFIDENTIAL
3 PCB Layout Design
Figure 24: Sensor Track Routing Requirements
Specifically,
• The trace should be as short as possible and no longer than 300 mm.
• The trace width (W) can not be larger than 0.18 mm (7 mil).
• The alignment angle (R) should not be less than 90°.
• The trace-to-ground gap (S) should be in the range of 0.5 mm to 1 mm.
• The electrode diameter (D) should be in the range of 8 mm to 15 mm.
• Hatched ground should be added around the electrodes and traces.
• The traces should be isolated well and routed away from that of the antenna.
3.9.3 Waterproof and Proximity Sensing Design
ESP32-S3 touch sensor has a waterproof design and features proximity sensor function. Figure 25 shows an
example layout of a waterproof and proximity sensing design.
Touch sensor (TOUCH1 ~ TOUCH14)
Protective sensor (TOUCH1 ~ TOUCH14)
Shied electrode 728&+
Figure 25: Shield Electrode and Protective Sensor
Note the following guidelines to better implement the waterproof and proximity sensing design:
Espressif Systems 26
Submit Documentation Feedback
ESP32-S3 Series Hardware Design Guidelines v1.0