Noggin
Member
Someone posted an article a while back which shows how to translate a SPI bus (or likely any bus really) from 3.3v to 5v so that one bus could work at both levels using only 1 fet and 1 resistor per line. I've been trying to find this document, but I have been unsuccessful. I have found Microchips 3.3 - 5v Tips 'n Tricks document, but I couldn't find what I was looking for exactly in there. I think I've replicated the circuit, but I wanted to compare it.