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Original question:

I have a question about PMP4451

PMP4451: circuit diagram & firmware define

Kiyong SON
Intellectual 545 points
Part Number: PMP4451

Dear TI-er.

My customer want explain circuit diagram & firmware define.

plz help me.

    #define CURRENT_A_LOAD_ATTACH_THRESHOLD  2
    #define CURRENT_A_LOAD_FULL_THRESHOLD       2
    #define CURRENT_A_OVER_LOAD_THRESHOLD  44
    #define CURRENT_A_TYPEC_HALF_THRESHOLD     22

  • 0
    TI__Expert 5425 points

    Hi Kiyong,

    We are looking into this questions and will be back to you soon.

    Thanks,

    Robert

  • 0
    TI__Intellectual 945 points

    Hi, Kiyong,

    This circuit diagram is designed for whether there is the device on port A. The logic is: MCU will send the EN_OUT signal(high level) periodically and use the ADC to read the Io_A value. In the firmware, there is the load attach, over load macro define for port A. The value of  Io_A will be compared with defined value.

    1.  When the value of  Io_A is above load attach value, the netGND_A of port A will connect with PGND through turning on Q11 and R5.

    2.  When the value of  Io_A is above over load value, the net GND_A of port A will disconnect with PGND through turning off Q11.

    Thanks!