TCA9803: Schematic review request

Stefan Agasvari

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

4 months ago

0 Michael Ikwuyum 4 months ago

TI__Mastermind 35365 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 Lukasz Kawinski 3 months ago in reply to Michael Ikwuyum

TI__Prodigy 435 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 Clemens Ladisch 3 months ago in reply to Lukasz Kawinski

Guru 290750 points

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

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TCA9803: Schematic review request