interface serial rx/tx to 3.3 volt uP
Posted: Mon Jun 19, 2017 7:07 pm
I want to connect the roboclaw serial pins to a 3.3 volt micro controller. I know to scale the TX pin with a voltage divider so as not to damage the uP RX pin.
Question. Is the 0 to 3.3 volt signal from the uP TX pin enough to drive the Roboclaw RX pin? or do I need to translate this up 5 volts? How does the RX pin work? Is it just a high value pull up?
I know I can simply experiment but I need to know if this use is in-spec and going to be reliable
Question. Is the 0 to 3.3 volt signal from the uP TX pin enough to drive the Roboclaw RX pin? or do I need to translate this up 5 volts? How does the RX pin work? Is it just a high value pull up?
I know I can simply experiment but I need to know if this use is in-spec and going to be reliable