The inputs are supposed to work with a Vih up to 5V (Specification: Input levels: any logic standard from Vih = 1 V to Vih = 5 V).

However, the inputs are just protected by a fuse in series with a diode connected to 3V3.
Therefore with any Vih higher than 4.0V the fuse may blow and the input signal will not be correctly handled.

• Redo input circuit protection. Note that the same connector can also be used as output.