It’s an epaper display that works from 3.3V to 5V. It does work at 3.3V but it has an high deep sleep power consumption.
If instead I provide an higher voltage power consumption drops. I’m not sure why, I was advised to try this by the manufacturer.
The difference is substantial: with both Xiao and screen in deep sleep current goes from [email protected] to ~100uA@4V
Max current is 6mA during updates