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LM5066: ADR0-ADR2 input specification

Part Number: LM5066

Unfortunately, in the LM5066 datasheet I could not find any information about the input thresholds of the ADR0-ADR2 inputs or about the input currents for these inputs in the VDD or GND state. How are these inputs internally polarized (internal resistors to VDD and GND)?
This is important because the PMBUS address is set in a different place and we want to use serial resistors on the address lines.

Best regards

Michal

  • Hi Michal,

    Welcome to E2E!

    These are tri-state pins. By default these are floating unless external circuit pull-up or pull-down the pin. Can you let me know what exactly you are looking for ?

    Best Regards, Rakesh

  • Hi Rakesh,

    The LM5066 datasheet clearly states that the address inputs should be connected to VDD, GND or left open. However, our experience so far shows that the input currents are negligible and our solution works in many similar places.
    For the clarity, I enclose a section of our schematic, as well as how the internal structure of the address input of the LM5066 system probably looks like.

    The information I asked about would allow us to determine what pullup and serial resistor values we can use to safely define the LM5066 address. The address (1 of 5)  is set on the other side of module connector.
    If this information is not available, please suggest the value of these resistors. Serial resistors are used mostly for security reasons.

    Best regards
    Michal Laszczynski

  • Hi Michal,

    Thanks for the details. I will check whether we have information available on the internal resistors or not and let you know early next week.

    On the external pull-up, we use standard 10kOhm resistor.

    Best Regards, Rakesh

  • Hi Michal,

    Sorry, we don't have details of internal pull-up and pull-down resistors. Please use external pull-up of standard 10kOhm resistor and let us know if you see any issues.

    Best Regards, Rakesh