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Original question:

TPS2511: Issues with IOS devices

TPS2511: Issue when charging IPhone 6s

PYTsai
Genius 9935 points
Part Number: TPS2511

Hi 

We see an issue that when charging iphone 6S, the iphone 6S touch response will delay.  Would you help review if below DP and DM behavior are correct ? 

Below are the waveform (Purple line is DM waveform, the Blue line is DP waveform)

1.  Waveform before connected to iphone 6S (DP is 2.84V、DM is 2.17V)

2. at the moment iphone connected, see DP and DM drop as below wave form. 

Then DP DM become this waveform 

finally it will settle at below waveform (within 20 sec after the iphone are plugged)

  • 0
    TI__Genius 9630 points

    Hello,

    Can you label the different voltages the DP DM go through as the device is connected?

    Thanks,

    Emma

  • 0 in reply to Emma Hoying
    TI__Genius 9935 points

    Hi Emma,

    I labeled the voltage as below 

    1.  Waveform before connected to iphone 6S (DP is 2.84V、DM is 2.17V)

    2. at the moment iphone connected, see DP and DM drop as below wave form. 

    Then DP DM become this waveform 

    finally it will settle at below waveform (within 20 sec after the iphone are plugged)

  • 0 in reply to PYTsai
    TI__Genius 9630 points

    Hello,

    Thank you for your clarification. The scope captures show the DP and DM lines going through enumeration in order to settle into the correct DCP charging scheme. This is the DP DM pin's expected behavior. Below is more explanation from the datasheet about the different charging modes DCP auto offers. 

    Thanks,

    Emma