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Original question:

PCA9306: PCA9306 leakage current as standby mode

PCA9306: Question about chip leakage current

Zhengquan Lu
Intellectual 1035 points
Part Number: PCA9306


Hi team,

     When customer use PCA9306 device, if they power down VREF1 1.8V and power up VREF2 3.3V, whether would PCA9306 device have leakage current through CAN or power pin?

Best Regards

Zhengquan Lu

  • 0
    TI__Guru* 75531 points
    Hey Zhengquan,

    You would see a leakage current from Vref2 into Vref1 at the magnitude of (3.3V-0.6V)/200k based on your image.


    "whether would PCA9306 device have leakage current through CAN or power pin?"
    I am unsure what you mean by through CAN.

    Thanks,
    -Bobby
  • 0 in reply to BOBBY
    TI__Intellectual 1035 points
    Hi Bobby,
    Thanks a lot for your help! Customer wants to know the VREF1 voltage in this case. Could you please help to check this? Thanks!

    Best Regards
    Zhengquan Lu
  • 0 in reply to Zhengquan Lu
    TI__Guru* 75531 points

    Hey Zhengquan,

    The question of what the voltage will be is something that is dependent on what is sitting on the Vref1 side and the internals of what they are. If there is no path for the current to travel then the voltage will build up until a path appears (such as intrinsic body diodes). If Vref1 is truly GND (0V) then the Vref1 path will be GND as well.

    I assume if Vref1 is powered by an LDO then the Vref1 path will be around 0.7V.

    -Bobby

  • 0
    Guru 317800 points

    The application report Voltage-Level Translation With the LSF Family (SLVA675) says:

    If either Vref_A or Vref_B are grounded, the switch behaves as an open circuit.

    You can also ground the EN pin to ensure that all I/Os are high impedance: