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TPS23881: Technical Inquiry on TPS23881RTQ AUTO Pin Functionality

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Prodigy 40 points
Part Number: TPS23881

Tool/software:

Dear TI Technical Support,

I would like to raise a question regarding the AUTO pin behavior of the TPS23881RTQ. Could you please provide clarification on the following points:

  1. The exact conditions required to enable autonomous mode via the AUTO pin (e.g., resistance range to GND, tolerance).
    　

  2. Whether different resistance values correspond to specific operating modes, and if so, the detailed mapping table.

  3. Can the AUTO pin be left open or floating without external connection?





Your support and clarification will be greatly appreciated.

Best regards,

  • 0
    TI__Prodigy 595 points

    Hello, 

    Thank you for your question. See answers below in blue: 

    1. The exact conditions required to enable autonomous mode via the AUTO pin (e.g., resistance range to GND, tolerance).
      In order for the device to start up in autonomous mode, the AUTO pin should be connected to a resistor (value corresponds to power class, see answer to Q2 below) and 0.01uF cap placed in parallel with each other. These are the only external hardware conditions required for the device to start up in autonomous mode.  　

    2. Whether different resistance values correspond to specific operating modes, and if so, the detailed mapping table.
      The AUTO pin allows the user to configure the device in autonomous mode using hardware. The different resistor values seen in the screenshot attached to your question correspond to different power class configurations for when the device is operating in autonomous mode. If this pin is configured using hardware, the device operates in autonomous mode only. Please refer to the table below. 

    3. Can the AUTO pin be left open or floating without external connection?

      Yes, the AUTO pin can be left floating for when the device is operating in a different mode or if auto mode will be enabled after start up using I2C register commands.

    Please let me know if there are any further questions.

    Best,

    Anagha