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Original question:
TSC2046E: How does /PENIRQ work and how does it detect when a finger is released?
Hello Team,
Can you assist me in debugging some behavior my customer is seeing on the TSC2046E touch screen controller?
The customer has implemented this device directly connected to a KD024B-3AFPC touch screen by 4-wire interface. They are powering Vcc and IOVDD off the same 3.3V rail. #PENIRQ is directly connected to an MCU.
The question is if the attached waveform is behavior we would expect to see from the #PENIRQ pin when contact is made with the resistive touch screen.
From the documents and other E2E posts I've read, I would have expected contact with the touch screen to pull the 4-wire interface pins low, including X+ shown on waveform, as well as #PENIRQ.
Any thoughts about how we can identify why the #PENIRQ and X+ signal may be showing this immediate ringing instead of a clear logic low?
Thank You,
Jacob Butler
