Powering VDDIO from internal regulator | Cypress Semiconductor
Powering VDDIO from internal regulator
On one of our boards we need many pins with VDDIO = 1.8V.
We have a 1.8V converter on board, but it should be equipped with an enable input, as
it powers many other components.
The PSoC is powered from and external 3.3V source.
In order to avoid the dependence on an external 1.8V source I wonder whether we
could power one VDDIO-bank from the internal regulator for digital logic, VCCD.
The data sheet says: "The regulator output is not designed to drive external
circuits.", but would VDDIO qualify as "external circuit"?
I could think of using two Shottky diodes and supplying VDDIO from the onboard regulator when it is up,
and use VCCD only to get enough supply to activate the enable output.