Main Site Documentation

5v tolerance



are Hydra & Cerberus boards 5V tolerant on digital IO ports?

Thanks, Greg


You should check the specific datasheets for the processors. The Cerb family documentation says they are 5v tolerant, but the hydra equivalent does not say so.


It says this here (

[quote]All GHI Electronics boards use processors that run on 3.3V so the highest voltage the pin should ever see is 3.3V. This is true for ChipworkX and FEZ
Hydra but not for EMX. EMX is 5V-tolerant. This means that even though the processor runs on 3.3V, it is capable of tolerating up to 5V on its inputs. Most digital chips that you would be interfacing with are 5V. Being 5V tolerant allows us to use any of those digital circuits with our processor.[/quote]

So I guess it’s like this:
FEZ Spider - 5V tolerant (tested by me!)
FEZ Hydra - not 5V tolerant (correct me if I’m wrong)
FEZ Cerberus - 5V tolerant


Think some of the Cerb analog are only 3v3?


This is digital only :slight_smile: