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TCA9555: TCA9555 port switch

Part Number: TCA9555

Hello Team,

When one port switch to another port, there should be some delay. My customer need to change I2C frequency when their board works, but we can't find the switch time for different I2C frequency.

if the I2C frequency change from 40K to 200k, what's the switch time spec? Thanks

Regards,

Nanfang

  • Hello Nanfang,

    Once Port 0 changes its state it take another 9 clock cycles before Port 1 can change.  If you are changing data rates then you change that time between port writes.

     Does that make sense?  What is the customer trying to achieve?  Can you tell me more about the application and how he is using the IOs?

    -Francis Houde