I have just (20 mins ago) started looking at the possibility of using PMBus in future products and have come across the PowerOne licensing issue (referenced by electronicdesign.com), but also other info that says the bus is an open technology...
I am unclear as to who exactly needs to license to use this in a product.
E.g. if we wanted to produce a power supply that used PMBus enabled POL devices or PMBus controllers I'm guessing the device manufacturer needs to be the one licensed and not us, is that correct?
If we wanted to implement an MCU in our theoretical PSU, as an PMBus device/controller would we then need to license it?
Going back to the first case where only pre-licensed devices are used, if the bus master was a computer then the computer would require programming as a type of PMBus master controller - would that require licensing?
Has been suggested that the license is only on POL regulators, is that the case does anyone know?