Touch Trackpad Connections

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1

Hi Tinkerers,

I made a breakout board for the touch sensor to connect to my arduino. In short, the sensor should spew out X,Y coordinates via I2C. But I have some questions regarding the connections.
Datasheet here: Sensor Datasheet.pdf - Google Drive

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I would like to confirm Pins 1, 8, 10, 12 and 14. What I did was:
Pin 1 = Arduino GND (same with pin 5)
Pin 8 = 3.3V (not sure if it should be 1.8V according to above)
Pin 10 = Arduino GND (same with pin 5)
Pin 12 = 3.3V until button press to 0V
Pin 14 = 3.3V until button press to 0V

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I designed a breakout board for the sensor knowing that Arduino I2C uses 3.3V, so I used a simple level shifter to convert my signals to 3.3V. However, I see pg5+6 of the datasheet says DVDD has a max rating of 1.95V but the section below says Serial Interface has VIH = VDDIO+0.05V (VDDIO = 3.3V in my design, which is within its working range). From my understanding it should be no problem for me to communicate with my Arduino, but what does DVDD mean in this case? Should I make adjustments?

Any help would be appreciated! I almost got it working! Thank you all in advance!

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The data sheet looks very preliminary, e.g. the code on pg. 23 looks crappy to me.

I only can guess that DVDD is generated by the module, at least it's not a pin of the interface connector. But as it's listed on Absolute Maximum Ratings, it may be a required supply voltage as well. For the digital (controller) interface VDDIO is significant.

3

Gotcha thanks. It looks like connecting VDDIO to 3.3V is the correct thing to do. Still unsure why DVDD is in the datasheet if not used.