TCA9555: SDA two steps

Allan Fan

Expert 7390 points

Part Number: TCA9555

Tool/software:

Hi experts,

Customer used TCA9555 and saw SDA has two steps although all the timing spec seems ok and meet DS spec.

Would you please clarify is there any concern or what might goes wrong?

Regards,

Allan

over 1 year ago

+1 Clemens Ladisch over 1 year ago

Guru 319120 points

Such steps happen when multiple devices or devices with different drive strenghts pull the line low. This is OK as long as the I²C timing and voltage requirements are met.

0 Tyler Townsend over 1 year ago

TI__Guru 53928 points

Hi Allan,

Please let me know if Clemens answered your question.

Regards,

Tyler

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TCA9555: SDA two steps