Hello Hamamoto-san, We've reviewed the material, thank you for sharing. The schematic looks appropriate. Can you confirm two more things? 1.) What communication method are you using to communicate with the TSC device? It looks like the conversion timing shown in Figure 11 2.) Are you using one of the methods described in Page 12 to overcome some of the common issues with touch-screen settling when using large external capacitors? If so, can you confirm which one? With A0-A2 set to 100 this will configure the device for a Y-Measurement with X+ connected to the ADC input. You can see the Y- driver become active in the image and get pulled to GND when the device enters low-power mode as defined by the PD0/PD1 settings of 00 which should then enable the PENIRQ input. In this state X- will be floating and will get pulled to the same voltage as X+ (which is monitoring the PENIRQ function) but will have to charge the capacitor tied to the input through the associated touch resistance. Would it be possible to switch the Y- probe to the X+ pin so we can review the X+ and X- behavior at the same time for the longer PENIRQ case? In your diagrams PENIRQ looks to go low somewhat based on the rise/fall characteristics of the X- input which we'll need to investigate further.
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