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TPS2514A: Smartphone charging

Luca Riva
Prodigy 20 points
Part Number: TPS2514A
Other Parts Discussed in Thread: TPS2514,

Hello,

I am trying to charge both an iPhone and an Android Smartphone with a simple desk power supplier.

I have a simple PCB that is able to connect the 4 cables V+, DP, DN and GND to a USB-C connector.

The V+ and GND are connected to the 5V power supplier able to provide up to 3A.

All the 4 cables are also connected to the TPS2514 chip to allow the smartphones to work correctly.

The Android Smartphone is requiring 1.5A (I thought that with this chip I could use the fast charging up to 2.4A).

The iPhone is continuously switching the current when it is switched off between0.46A (when showing the charging icon) and 0.3A when not showing it (like 7s with the icon and 1s without  it).

As soon as the iPhone switches on, the current goes down to 0.02A and the smartphone switches off again.

I wasn't expecting this behavior.

Can you please help me understanding how to correctly handle the charging of both smartphones?

Thank you very much.

  • 0
    TI__Expert 8560 points

    Hi Luca,

    We have received your question and appreciate your query. Our team is experiencing a high volume of E2E requests recently. We appreciate your patience as we work through our received threads. We will provide a response in the next 2-3 days.

    Best,

    Alex

  • 0
    TI__Mastermind 26550 points

    Hi Luca,

    The phone is able to determine what current mode it wants to select.  The TPS2514A only offers BC1.2 and certain divider modes.

    The android phone appears to be selecting the BC1.2 CDP mode which will be 1.5A and not supporting divider modes that would offer the 1.5A.

    The Iphone appears to be only accepting SDP mode which would be 0.5A.  

    In order to decode what is happening, I would have to see a scope capture of the D+/D- lines, but what you are describing for the Android phone is behavior that I would expect to see based on my history.

    The Iphone behavior will be very dependent on what phone version it is, what OS version is installed, and the cable used, so I cannot offer much help with that behavior.

    Regards,

    Chuck

  • 0 in reply to Chuck Branch
    Prodigy 20 points

    Hi Chuck,

    Here below two pictures showing the D+ and D- signals.

    On the left we can see the setup while connected to the iPhone 15.

    On The right we can see the setup with a Xiaomi Mi 10.

    By searching online I found that Apple devices should work in fast charging 2.4A by setting the two signals to 2.7V.

    As you can see the two signals are set to 2.7V but the iPhone doesn't even show to be in charging.

    For the Xiaomi Smartphone I don't know the exact voltage to set 2.4A (fast charging).

    Thank you very much for your feedback.

    Regards.

    Luca

  • 0 in reply to Luca Riva
    Prodigy 20 points

    For testing purpose I also took a simple USB cable and connected D+ to D- to 2.7V power regulator and the power supply to 5V.

    Then I connected the USB cable to the iPhone 15 and the current was about 0.97A (not 2.4A as expected).

  • 0 in reply to Luca Riva
    TI__Mastermind 26550 points

    Luca,

    If the correct voltages are present, then it is the Iphone that is choosing to draw less current.  The TPS2514A  has advertised the correct option and the phone has selected not to use the power offered.

    Regards,

    Chuck