48.5.1 Touch Sensor
Self-cap touch sensor
Figure 48-2. Self-cap Touch Sensor structure and Electric field
Sensor structure:
• Cs: Intrinsic self capacitance. 10pF ~ 50pF as usual.
• ∆Cs: Touch generated self capacitance. 0.3pF ~ 2pF as usual.
• Sensitivity of sensor: ∆Cs/Cs. 1% ~ 10% as usual.
Intrinsic performance depends on: electrode pattern design, thickness/dielectric of
overlay and PCB routing.
Mutual-cap touch sensor
Chapter 48 Touch Sensing Input (TSI)
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