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TCA9535: multiple TCA9535 application

Taketo Sato
Genius 10365 points
Part Number: TCA9535


Hello team,

I have a quick question.

I have three TCA9535s and would like to read each port0 and port1 by accessing each TCA9535 continuously

When accessing other TCA9535, do we need to send stop condition once? or sending restart is fine?

Best regards,

  • 0
    TI__Guru* 76221 points

    Hey Taketo-san,

    To my understanding doing a restart condition should work. Our I2C switches do require stop conditions but the I2C IO expanders don't have this requirement. I also looked at an older IO expander's state machine flow diagram and did not see anything that showed the device requires a stop condition to be issued. I suspect the restart will work if you NACK to the slave prior to it.

    -Bobby