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Figure 48-3. Mutual-cap Touch Sensor structure and Electric field
Sensor structure:
• Cm: Intrinsic mutual cap. 2pF ~ 10pF as usual.
• ∆Cm: Touch reduced mutual cap. 0.3pF ~ 2pF as usual.
• Cs: Parasitic self cap. 10pF ~ 50pF as usual.
• Sensitivity of sensor: ∆Cm/Cm. 1% ~ 20% as usual.
Intrinsic performance depends on: electrode pattern design, thickness/dielectric of
overlay and PCB routing.
48.5.2 Brief timing and Operation of TSI
TSI works by switching integration, no matter under self-cap mode or mutual-cap mode.
The difference of sensing modes is on analog processing.
Brief timing
Functional description
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
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NXP Semiconductors
Summary of Contents for Kinetis KE1xZ256
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