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UCD90320U: Best way to set LGPO to Tri-State

Jacob Butler
Intellectual 1510 points
Part Number: UCD90320U

Hi Team,

Can you help me confirm the best way to put an LGPO into Tri-State?

1. The first method I'd expect would be setting the LGPO as a command controlled GPO in Hi-Z and seems to be the most simple.

2. The second method looks to be adding the pin, configuring to Active High, Open-Drain, and being able to set a delay with no logic: Ie Delay = 10ms * <No Logic>

My understanding is this would hold the pin low for 10ms on power up and set to Tri-State afterwards, correct?

3. The third method could be deleting the LGPO from configuration and leaving unassigned.

What behavior might I expect from leaving the LGPO unassigned?

The LGPO in question this time is D5, but would expect applicable to all LGPO.

Best Regards,

Jacob Butler

  • +1
    TI__Guru 60800 points

    Hi

    For the D5, does customer want to configure this pin as a tri-state output signal only or configure it as a tri-state Logic GPO output.

    They are different.

    If you just want to have D5 as tri-state output , you can use configure it as command-based GPO output,

    but if you want to have D5 as a tri-state logical GPO output, the only way is to configure this as a open-drain, based on the logic, it can be either HIGH or Low.

    It does apply all the IOs.

    The LGPO pin means that those pin can be used as logical control GPO output while the rest IOs can not.

    Regards

    Yihe

  • 0 in reply to yihe
    TI__Intellectual 1510 points

    Hi Yihe,

    For this instance, customer is only looking to have pin not impact connected trace to avoid layout change of previously connection.

    Thank you for the clear explanation, that does explain the difference.

    Best Regards,

    Jacob