Can I use 3.3V level on SDA/SCL line instead of 1.8V as on yours reference design ?
In the datasheet , the limiting value is VSYS+ 0.5. But there is no information on maximum value. Is it the same ?
Yes, you can connect SCL/SDA lines to 3.3V level instead of 1.8V.
Please note, that you might need to increase the values of the pull-up resistors. Please refer to section 7.1 , page 55 of an UM10204 attached.
With Best Regards,