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Questions about TPS23851

Grant Wang84
Prodigy 150 points
Other Parts Discussed in Thread: TPS40210
  1. Can TPS23851 realize PD detection, classification and start-up just with default registers setting not to programm registers?
  2. TPS23851 need an additional 3.3V digital supply. Is there a easy and simple solution to generate 3.3V not like the way in EVM user guide.
  • 0
    TI__Mastermind 42795 points
    • Can TPS23851 realize PD detection, classification and start-up just with default registers setting not to programm registers? Yes,use auto mode by setting the AUTO pin = 1. Refer to the RST State column for the POR state of each register. "A" = logic state of the AUTO pin after POR.
    • TPS23851 need an additional 3.3V digital supply. Is there a easy and simple solution to generate 3.3V not like the way in EVM user guide. The EVM uses 3.3V to furnish other "support circuits" which may not be required for every application. VDD requires 2mA typical for TPS23851 but additional current may be required for pullups and I2C interface circuits. Refer to Opto-biasing on pg 28 for additonal information which may be helpful. The choice of linear vs. switching conversion will depend on the required amount of 3.3V current required.
  • 0 in reply to Eric Wright
    TI__Prodigy 150 points

    Thanks for your reply.

    So if TPS23851 is configured in Auto mode, does it mean I needn't to use micro-controller and I2C control and just one single TPS23851 to complete everything? 

    My customer want to use single input supply rail to power TPS23851 board. It means they need circuit to convert -48V to +3.3V. In our EVM, it is TPS40210.

    As you mentioned, 3.3V VDD for TPS23851 only need 2mA current. If TPS23851 in AUTO mode, there needn't I2C pullup. And I just consider current consumption of Opto-biasing.  Then total 3.3V current consumption should be lower than 20mA.

    Do I understand your answers correctly?