Yes, my code adheres to the DCC standard. It's an interrupt driven state machine. I have it working with the LMD18200, however with the price of that chip being $16 or so and your MC33926 carrier being only $2 more with about the same current capability, I would prefer a finished device as a driver. Thanks very much for the link to the truth table, I had missed that. I will do some research this weekend. I am also evaluating the VNH5019 for powering DCC for large scale (G) locomotives as it can source 12A (nice!). I will post my findings here, thanks again for the info.