TCA4311A: Some quetions of TCA4311A Replace PCA9511

Kane Zhang

Part Number: TCA4311A

Dear experts,

now our customer used TCA4311A replace PCA9511, but test result is not ok, it seems that the noise immunity of TCA4311A worse than PCA9511, When using PCA9511, it is ok . Switching to TCA4311A will not work properly

Could you please give some advice and guidance? the circuit is below:

over 6 years ago

0 BOBBY over 6 years ago

TI__Guru 72981 points

Hey Kane,

Can you show me some waveforms of what you are seeing?

How much capacitance do you have on the bus? (I see you have caps on SDA/SCL)

Are you able to increase your pull up resistors to 20k?

Thanks,

-Bobby

0 Kane Zhang over 6 years ago in reply to BOBBY

Intellectual 585 points

Dear Bobby,

now i want to know how should we connect the IN & OUT about TCA4311A,

if it is: " Master(A) to TCA4311A to (B) to Cable to (C) TCA4311A to (D)Slaver;"

0 BOBBY over 6 years ago in reply to Kane Zhang

TI__Guru 72981 points

Hey Kane,

I decided to answer your new question in your new thread as it is a different topic from this one. Please check that thread for that answer. If you still need support on this issue, please provide scopeshots and input on the previously requested information.

Thanks,

-Bobby

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TCA4311A: Some quetions of TCA4311A Replace PCA9511