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Optional power on Vxxyy — Parallax Forums

Optional power on Vxxyy

ikskuhikskuh Posts: 1
in Propeller 2

Does someone know if it's okay to not power a Vxxyy rail?

I want to build something that has a switchable power supply for a subsystem and i want to use that subsystems (switched) +3V3 signal for the Vxxyy pins, so the ADC measures against +3V3 of that subsystem instead of the global +3V3 rail.

But i'm not quite sure, from the datasheet it reads like it must always be powered on.

Comments

  • evanhevanh Posts: 16,757
    edited 2025-09-29 09:32

    Yep, no problem with doing that, afaik. There are exceptions though: V2831 is needed at all times to maintain the internal clocking circuits. And V6063 is needed to maintain the reset circuit.

    PS: For a low power sleep mode, I suspect reduced voltage on those two supplies when idling will be okay too. Especially if the crystal gets disabled beforehand. Then it's just running on the internal R-C oscillator.

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