The datasheet suggests that Vsel has a weak pull-up, which should result in the selection of 5v output. This does not appear to be the case, the output is 3v3 and measurement of the pin give 0v with a multimeter and a flat 0v with x10 scope probe.
I received a response back from the designer:
The data sheet is wrong, there is no weak pull-up or pull down for the Vsel pin.
We will correct the datasheet.
Weird Dave: I need to check this out and get back to you.
Weird Dave: I tested the ADuM5000 on the bench and when the VSEL pin is open, the Viso voltage output is 3.3V. I will ask the designer about this.
Retrieving data ...