How to best connect a 5V input signal to an MKR WiFi 1010?

Question

I have a bunch of 5V signals I want to process with my MKRWiFi1010, but that only takes 3.3V max.

What is the best way to connect these signals? They are video signal (HSync, VSync and Video) where the fastest signal is about 3-4MHz.

Would a simple voltage divider work?

Answer 1

You have to use a logic-level converter. You can make one like this:

https://www.pcbway.com/project/shareproject/5V_3_3V_Logic_Level_Shifter_IC_for_Arduino_and_Raspberry_Pi_df288874.html

Or buy one ready-made like this: https://www.sparkfun.com/products/12009

Answer 2

Yes, a simple voltage divider will work.

You will need to take stray capacitance, driver capability, and input impedance into account.