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TDA4AEN-Q1: EVB schematic design question about VDDSHV_CANUART testing

Gibbs Shih
Expert 6135 points

Part Number: TDA4AEN-Q1

Hello Expert.

We study TDA4EVB SCH (E3B), PROC170E3B(002)_SCH.pdf

We still do not understand why should we need to remove R78 & add R77.

Need you explain more detial.

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Thank You.

 

Gibbs

  • 0
    TI__Guru 56645 points

    The schematic note is out of date, specifically the resistor reference designators.  Its is referring to the two resistors shown just above the note, specifically R213 and R224.

  • 0 in reply to Robert Eschler
    TI__Expert 6135 points

    Hello, Robert

    Thanks you replies.

    If TDAEAEN do not need to low power mode, that's mean VDDSHV_CANUART can connect to VDDIO_3V3.

    So we can remove R213 and add R224.

    If I say anything wrong, please correct my comment.

    Thank You.

    Gibbs

  • 0 in reply to Gibbs Shih
    TI__Guru 56645 points

    That is generally correct.  However the EVM is setup to use the lower power mode. So there could be other potential issue(s).  For example - some of the IO on the VDDSHV_CANUART rail are pulled up to VSYS_3V3 (always on power).  When moving VDDSHV_CANUART to VDDIO_3V3, the pull-ups could cause voltage domain leakage (which PMIC might detect as residual voltage error).  TI has not tested this configuration change.