• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 33 subscribers
  • Views 576 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

PCA9306: disconnecting/connecting pins on Vref2-side

JAP
Intellectual 2410 points

Part Number: PCA9306

Dear Experts,

Is it harmful in anyway if pins 5, 6, 7 and 8 are disconnected and then reconnected while Vref1-side(pins 1, 2, 3 and 4) stays connected all the time? Can this damage part or cause any other issues? We can assume that SDA1 and SCL1 are pulled high during disconnection and reconnection of Vref2-side.

Thanks!

Rgds,

Juha

  • 0
    TI__Mastermind 24896 points
    Hello Juha,
    Can you explain why you are trying to do this?

    If you try and simultaneously disconnect pins 5,6,7, and 8 from the circuit, you might have some issues. EN and Vref2 setup the reference voltage for internal pass FETS and if they are floating than you don't know where it might be and thus you may or many not be in a state where the pass FETs are on. If you can explain what you are trying to do I might be able to suggest what you might have to do to implement this such that nothing will get damaged. I am thinking you may want to have a large value pull down resistor on the EN-Vref2 connection to ground. That would ensure that pass FETS are always off until the correct pull-up resistance of 200k to Vdpu is achieved. I need more application information to understand what you are trying to do and why?
    -Francis Houde
  • 0 in reply to fhoude
    TI__Intellectual 2410 points
    Hello Francis,

    Slave devices are on separate attachable module. Supply voltage for slaves is generated on module and pull ups are placed in module. If module is removed, pins 5, 6, 7 and 8 are left floating.


    Rgds,
    Juha