Does this actually work on 3.3V logic?

[wsanders]

I am trying to get a MY9221-based device (Seeed circular LED) to work with a 240MHz ESP32 based device (M5Stack Core2) and all I get on the LEDs is random blinking.

As far as I can tell, the MY9221 is not "guaranteed" to work with a VDD of 5V and 3.3V logic levels. The data sheet says min logic level high voltage is 0.7 VDD, or 3.5 V.

The M5 device puts out 5V on its Grove interface but the logic levels are 3.3. Are you powering the LEDs in your ESP32 demo with VDD = 3.3V or 5V? Does your light bar actually work on 3.3V logic with a 5V VDD?