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TCA9803: Schematic review request

Stefan Agasvari
Intellectual 835 points
Part Number: TCA9803

Tool/software:

Hello.

Please be so kind and help to review customer schematic using TCA9803 provide your feedback and eventually any proposal if you have any.

If the resolution is not good let me know I can send it over email.

Thank you and best regards

Stefan

  • 0
    TI__Mastermind 36955 points

    Hi Stephan,

    Schematic looks good overall. However, please see 9.4.1.1 of the data sheet  recommending no pull-ups on the B-side.

    Also, remove R71 and R72 and place the decoupling caps as close to the power supply as possible (cap should be for each power supply and not for every I/O), thanks.

    Best Regards,

    Michael.

  • 0 in reply to Michael Ikwuyum
    TI__Prodigy 445 points

    Hi Michael,

    Could you confirm that they don't need and external pullup resistor on the B-Side?

    According to the client, B-side is connected to Master and is also on the same line as the 2 slave. They already have a pull up for  I2C bus, so they want to know if they can keep it or remove it.  Thank you in advance

  • 0 in reply to Lukasz Kawinski
    Guru 294210 points

    The TCA980x does not work with pull-up resistors on the B side. You must remove them.