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PCA9306: Pull-up res for Vref2

Roger Lin
Expert 4010 points

Part Number: PCA9306

Hi team,

The customer forgot to at the pull-up resistor for Vref2

Does it have any risk or affect anything?

 

Thanks

  • +1
    TI__Guru 58958 points

    Hi Roger,

    The customer is using the incorrect implementation of the device: 

    If you bypass the reference pin with the 200k, you create a high current path from VCC2 to VCC1 which can lead to damage of the device. The correct implementation should be as follows: 

    Regards,

    Tyler