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INA226: What should we do when sense pin route is long?

Andy Liu3
Intellectual 2500 points
Part Number: INA226


Hi experts,

My customer use INA226， and sense pin route is a little long, what should we pay more attention for INA226 if sense route is long? 

BR

Andy Liu

  • +1
    TI__Expert 4720 points

    Hello,

    Mainly noise coupling into the traces and trace resistance think of a resistor in series as the trace gets longer more resistance. The noise problem can be alleviated with differential/ differential type routing from Rsense to INA. The second problem is unavoidable and may not even be a problem depending on your application.

    You could also add an input filter close to the INA, this will cause more error as you have an addition resistor in series but will further reduce the noise. Placing this on your board and not populating it could be a good idea just in case.

    To really understand how much this will change your performance we will need more information on the application like Rsense, min/max current, trace length etc.

    Regards,

    Cas

  • 0 in reply to Castrense Nigrelli
    TI__Intellectual 2500 points

    Hi Cas,

    Thanks for your reply, and customer will test and if have other questions, I will reach out again.

    best regards,

    Andy Liu