I have so far been using some MAX3323EEPE chips for shifting between 3.3V and 5V logics on serial / UART communications. This is quite some stuff to solder on a PCB, and the chip is a bit expansive. I only do quite vanilla communications, such as up to 57600, absolute max 115200 baud rate.
Would this kind of shield:
do the trick?
And this kind?
- Edit 1: typical use: I am thinking about having a project built around a 3.3V micro-controller, but I will need to be able to talk to some 5V logics stuff too. I will have a 5V step-up converter on the design, so getting 5V is not an issue. Typically, I will need to talk to a RockBLOCK 9603, which seems to be rather 5V than 3.3V ( https://www.rock7.com/products-rockblock-9603 though not completely clear to me if it would be ok to power with 5V and talk through 3.3 logics level; but other things will definitely need 5V logics levels anyways, so good to put on board).