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UCD90320: Logic check for LGPO of UCD90320

HSU HANWEN
Intellectual 290 points
Part Number: UCD90320


Hi Yihe:

I want to check input of LGPO is following up with logic or voltage level?

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For example, I set GPI or GPO as Active low. And I set that GPI or GPO as one of logic of LGPO

Now, if there's a 3.3V input for GPI or output for GPO:

On logic wise, GPI or GPO is 0. But on voltage wise is 1.

I want to know LGPO judge GPI or GPO by logic wise or voltage wise? 

  • +1
    TI__Guru 66920 points

    Hi

    GPI is a input CMOS signal, it is considered as HIGH when > 2.4V.

    For the GPI, there are only two states: ASSERTER or DE_ASSERTED. A GPI configured as ACTIVE HIGH, it is considered at ASSERTED when it is HIGH(> 2.4V)

    The LGPO only care wither it is ASSERTED or DE-ASSERTED.

    For a LGPO output, when the logic of LGPO is logic TRUE, its output is ASSERTED otherwise the output is DE_ASSERTED. 

    Regards

    YIhe 

  • 0 in reply to yihe
    Intellectual 290 points

    Hi Yihe

    Briefly, LGPO will follow what the logic, GPI /GPO/etc, setting for true(asserted) or false(deasserted).

    It won't judge individually by itself.

    -

    Thanks for your help!