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TMDSCNCD263: Powering on over USB C doesn't seem to work ?

Seb Astien
Prodigy 30 points
Part Number: TMDSCNCD263

Hello,

I'm not sure what I'm missing but I'm having issues powering on the board through the USB C connector.

See pictures below:

  • It works when the board is powered from Mini-USB connector
  • Doesnt work when board is powered from USB C connector

Can anybody please help ?

Thanks

Seb

  • 0
    Guru 92251 points

    I haven't got a TMDSCNCD263 to try but section 3.1.1 Power Input Using USB Type-C Connector in AM263x Control Card User's Guide explains that the USB C power source needs to advertise that it can provide 3A at 5V:

    What are you using as the USB C connector power source?

  • 0 in reply to Chester Gillon
    Prodigy 30 points

    Hi Chester,

    Thanks for your response. Yes I have seen that part in the user guide.

    I'm using Power Supply of 5V/2.4 Amps and it works fine when using Mini-USB C connector.

    Since my application only blinks an LED, I wouldnt expect the board to to consume 3Amps ? However I don't have a 3Amps Power Supply to try unfortunately

  • 0 in reply to Seb Astien
    Guru 92251 points
    Seb Astien said:
    Since my application only blinks an LED, I wouldnt expect the board to to consume 3Amps ?

    I agree that wouldn't expect that to consume 3A, given that it works when powered using the Mini-USB C connector (a max of 0.5 for USB2.0 or 0.9A for USB3.1). However, the way the TUSB320LAIRWBR USB Type-C Configuration Channel Logic and Port Control has been used to enable the USB-C power input means unless the USB-C power source advertises it can supply 3A the control card won't be powered:

    Since the ADDR pin on the TUSB320LA is not connected the TUSB320LA is operating in "GPIO mode". Both TUSB_OUT1 and TUSB_OUT2 must go low for TPS2296_EN to go high to cause the TPS22965DSGT load switch to power the TMDSCNCD263 from the USB-C 5V input.

    TUSB_OUT1 and TUSB_OUT2 will both only go low when the USB-C power source advertises it can supply 5V 3A using the USB power delivery communication over the CC lines.

  • 0 in reply to Chester Gillon
    Prodigy 30 points

    What an amazing explanation :) Thank you Chester !