Q1.] Is the 1PPS signal output directly from OEMV's CPU? Is there any circuit protection between the 1PPS output pin on the OEMV header connector and the 1PPS generation source?
A1.] 1PPS comes directly from the Minos5 chip with the only inline protection being a transient voltage suppressor. This transient voltage suppressor is intended to deal with ESD (Electro-Static Discharge) and EFT (Electrical Fast Transients), but it is not designed to handle reverse voltage or sustained over voltage conditions.