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TPS6521825: Does PWR_EN control nPFO?

adevries
Intellectual 945 points
Part Number: TPS6521825

Hello TI Forums,

On TPS6521825, can anyone confirm if the nPFO signal is controlled by PWR_EN? If PWR_EN is low, does that force nPFO to go low as well? Or is PFI the only pin that controls the state of nPFO?

Thanks!

  • +1
    TI__Expert 3350 points

    Hi adevries,

    nPFO will go low when PFI pin falls below 0.8V, and this event can be used to trigger the beginning of the power-down sequence using OFFnPFO bit in the CONTROL register (Reg. 0x06).

    If nPFO is wired to PWR_EN (wire-OR with PMIC_PWR_EN signal from processor) in hardware, this will also trigger the beginning of the power-down sequence.

    This feature is intended to detect an early power failure on the input supply and allow the processor to make a decision to power-down correctly. However, it can also be hard-wired to begin the power-down sequence automatically using the PFI-->nPFO buffer and with nPFO tied to PWR_EN.

    Best,
    Emily