I have a project with multiple peripherals that work at 3.3-5V. To protect my controller (3.3V only), I’d like to power the peripherals with a separate supply, but only have a 5V on hand.
My question is whether it is a problem to power the peripherals with 5V at Vin pins, but communicate with them via 3.3V logic from the controller?
While I’m sure this could be hardware specific, I was wondering if there were any general rules regarding this.
In case this is hardware specific, my level-flexible peripherals I’m particularly curious about are a 3.5" display (3.5 TFT 320x480 + Touchscreen Breakout Board w/MicroSD Socket [HXD8357D] : ID 2050 : $39.95 : Adafruit Industries, Unique & fun DIY electronics and kits) and 12-bit DAC (MCP4725 Breakout Board - 12-Bit DAC w/I2C Interface : ID 935 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits).
I’ve tested this for short periods of time with no issues detected. However, I felt it was best to ask.
My apologies if this has been addressed before, I did a quick search but wasn’t able to find anything straightforward.
Thanks in advance for the help!