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TPS25831-Q1: support DCP shorted mode only

K.Yaita
Guru 29720 points
Part Number: TPS25831-Q1

Hi Team,

If my customer wants to support DCP shorted mode only, should he set CTRL1=CTRL2=1 and short D+ and D- through 200ohm?
*DP_IN pin and DM_IN pin are unconnected in this case.



Best Regards,
Yaita

  • 0
    TI__Mastermind 30000 points

    Hello,

    I've assigned this ticket to the relevant expert who will get back to you shortly

  • 0
    TI__Expert 8420 points

    Hi Yaita-san,

    If customer want to use the DCP mode , it should set the CTRL1=0 and CTRL2=1 , the TPS25831-Q1 has the DCP mode. In the DCP mode the DP and DM can short. You don't need to set the device to CDP mode.

    If customer set the device to CDP mode and add 200mOhm resistor between DP and DM , the device can't do the CDP handshake but it also can charge the phone.

    The phone will see the DP and DM short. Any way,  I still suggest customer choose the DCP auto mode for this application.

  • 0 in reply to Michael Tan
    Guru 29720 points

    Hi Michael-san,

    Thank you for your support.
    I have heard my customer wants to set ~7.5W (5V/ 1.5A) for his application and support DCP short mode only.
    How to set CTRL1/CTRL2 in this case?

    If he set CTRL2=1, CC capability broadcast is automatically set 3A.
    In addition, I believe divider 3 mode (5V / 2.4A) is more than 7.5W in DCP auto mode.

    Best Regards,
    Yaita

  • 0 in reply to K.Yaita
    TI__Expert 8420 points

    Hi Yaita-san,

    Yes, If the CTRL1=1 and CTRL2=1 the device will set at DCP mode. I don't know whether the port is type C or type A , if the charging port is type A port the max broadcast current is divider 3 mode 2.4A, If this is a type C port it will not broadcast 3A through CC1 or CC2 pin in the port.

    If customer don't need data  communication, It can add the 200ohm between DP and DM. That is no problem for the application.

  • 0 in reply to Michael Tan
    Guru 29720 points

    Hi Michael-san,

    Thank you for you reply.

    My customer considers using TPS25831-Q1 for general purpose type-C charging port.
    If he wants to restrict ~7.5W for his application, I believe he should set CTRL1=1 and CTRL2=0 and add the 200ohm between DP and DM.
    Is my understanding correct?

    Best Regards,
    Yaita

  • 0 in reply to K.Yaita
    TI__Expert 8420 points

    Hi Yaita-san,

    Yes, your understanding is correct.

    If your port is type C port. You can add the 200ohm to the DP and DM and set to SDP mode.

  • 0 in reply to Michael Tan
    Guru 29720 points

    Hi Michael-san,

    Thank you for your kind support.

    If we add 200ohm between DP and DM of Type-C connector, do you recommend DP_IN pin and DM_IN pin of TPS25831-Q1 are unconnected in this case?

    Best Regards,
    Yaita

  • 0 in reply to K.Yaita
    TI__Expert 8420 points

    Hi Yaita-san,

    Yes, You can do that !