Scroll pHAT HD with ESP8266 boards - Can it be used with 3.3V?

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1

I’ve found that the IS31FL3731 chip on the Scroll pHAT HD can work in the range of 2.7V to 5.5V
http://www.issi.com/WW/pdf/IS31FL3731.pdf

Does that mean that I can use the pHAT directly with an ESP8266 based board that works with 3.3V, like the D1 Mini?

2

You are aware that the Pi uses 3.3V logic, right? Not 5V logic. The scroll pHat will need 5V for power, but I would think all the other inputs should be fine with 3.3V signals. Have a look here, https://pinout.xyz/pinout/scroll_phat#

3

I didn’t know that. I guess i thought that since all the HATs I have and looked up on pinout.xyz uses 5V, then the logic must be 5V as well.

4

That’s one of the gotchas with a Pi. It’s powered by 5V but uses 3.3V logic. You have to be careful what you connect to it. Your only issue is the scroll pHat needs 5V for power.