In all the documentation made available for the RT1050, nowhere can a specification for the pin: DCDC_PSWITCH be found.
In order to calculate a delay filter for the pin to meet the criteria at least 1ms, a trigger level for the pin is needed.
It is in the DCDC_IN domain, but a specification for this domain seems unavailable.
Is it reasonable to assume it is 0.7*VCC?
From ref design:
You are fine, the PSWITH it is just like the Power On Switch for the DCDC to start working so it is attach to the same power rail, of the main supply for the DCDC, which means that you are correct assuming the 0.7*VCC
Hope this clarifies.