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Topics - Chris Electronics

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TFTs / NHD-4.3-480272EF-ASXN#-CTP touch controller interrupt signal
« on: May 13, 2016, 02:24:20 AM »

I've been using your forum for some helpful tips on getting my NHD-4.3-480272EF-ASXN#-CTP display going. The display part is fine, I am having trouble getting a interrupt response from the ft5306 controller.

I have been using my micro-controller(PIC32mz2048efm) working great with the microchip development board meb 11, which has a newhaven screen and observed the touch signals via oscilloscope to and from the on board touch chip that it uses, the interrupt signal and I2C SCL/SDA, so I have an idea on what response is expected, i.e the same as documented in the  NHD-4.3-480272EF-ASXN#-CTP data sheet.

I have implemented a ft5306 driver with my micro-controller(PIC32mz2048efm), however I don't get a interrupt signal pull down from the ft5306 controller when the screen is touched, so the I2C is never initiated.

I have created a wake signal as suggested in the data sheet and elaborated on your forum, that pulls down for 200ms from high to low back to high, this should turn the ft5x06 controller into the correct operational mode. I have used 10K pull up resistors as suggested,  but there is no interrupt signal response from the ft5306 touch controller. Would you have any suggestions? There should at least be a interrupt response from the ft5306 when the screen is touched regardless of the I2C host driver, after a wake up signal initiation.....?

Hope you can help,

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