Hi,
I compared FT5406 vs. FT6336, about I2C slave address:


I couldn't find any useful info from FT6336 datasheet about I2C slave address.
At first, it need to make sure I2C slave address correct.
Then, it need to check if I2C communication correct (get correct touch data).
I would recommend to use I2C analyzer to check if FT5406 driver also works with FT6336.
I do a search and find below resource for your reference about FT6336 driver:
https://github.com/adafruit/Adafruit_FT6206_Library
And you also could check with FocalTech, if they have suitable driver for FT6336 for your reference.
Have a great day,
Mike
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