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TCA9539-Q1: Schematic review

Part Number: TCA9539-Q1


Is it possible to perform a schematic review of the attached document?

Thanks in advance,



  • Baptiste,

    Thanks for including the schematic! I took a look at the implementation of the TCA9539-Q1.

    I only have one note: I see that P1_6 and P1_7 are floating. If these are to be left floating, please ensure that these pins are configured as outputs. Alternatively, leave these pins as inputs and connect them to either VCC or GND. Leaving an input pin floating causes significantly increased current consumption, since the input will likely sit at midrail and cause current to flow across the stage.

    Other than that, I did not notice any concerns with your schematic.



  • Dear Danny,

    Thanks for your reply, 

    Ok I will follow your recommandation and add a note in the shematic that all unused pin shall be configured as output.

    Best Regards,