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TPS25810-Q1: Charging compatibility

Umberto Frangi
Expert 4045 points
Part Number: TPS25810-Q1
Other Parts Discussed in Thread: TPS25810A-Q1, TUSB319EVM, TPS25810, TPS2514A

Hi,

 I would like to report this issue detected by one of my customers:

Basically both with your evaluation board and our on-board implementation we are facing major issues with USB-C Samsung smartphones only.

We are using a TUSB319EVM evaluation board (as we do not have a TPS25810EVM available at the moment), which is very similar to TPS25810A but it does not have the integrated power switch. Our design follows the  TPS25810A-Q1 reference.
 The only part we skipped from the reference is the legacy module for USB Battery Charging, because we are interested in USB-C support only at the moment, and Samsung smartphones we tested are compliant to the lastest Type-C standard (they even support PD), so they are supposed to work with no legacy chips.

 

Samsung smartphones with USB-C (we tried many different S8 and S8+) will show a "low speed charging" popup to the user when connecting the cable (telling the user to use original adapters only), and by monitoring the charging current we can confirm it is almost zero.
 This is very bad from the user experience point of view, and of course because charging does not work. Shorting D+ and D- will cause the charge to start on S8 and S8+ phones too, but it is because it is using old USB Battery Charging standard, not Type-C. All the other tested smartphones (Xiaomi, LG, OnePlus, ...) work with no issues with D+ and D- left floating.

Thanks

Umberto

  • 0
    TI__Expert 8980 points
    Hi, Umberto,

    1.So customer found the issue on tps25810A-Q1, and you duplicated the issue on TUSB319?
    2.Your description is very clear, I will try to find a S8 phone to test in lab.
    3. In case I can't find the phone, can you try to get a 810EVM to test it?

    Thank you.
    Bob
  • 0 in reply to Bob Ma
    TI__Expert 4045 points

    Bob,

     the customer tested Samsung phone with TUSB319 EVM  and he found the compatibility issue and assumed this will happen also with TPS25810A EVM, because they have the same core; he does not have now any TPS25810 EVM for testing, maybe I can order one for him.

    I do not have any EVM and Samsung phone to test.

    Thanks

    Umberto

  • 0 in reply to Umberto Frangi
    TI__Expert 4045 points

    Bob,

     a correction: the customer tested also TPS25810 device using their own board and found same issue.

    Pls let me know when you can replicate this tests to verify this situation.

    Thanks

    Umberto

  • 0 in reply to Umberto Frangi
    TI__Expert 8980 points

    Hi, Umberto,

    I can't find a Samsung S8 phone to test, but I use Google pixel2 to test.

    When CHG=1,CHG_H=0, cc capability broadcast is 1.5A, Google pixel2 charging current is 1.5A.

    When CHG=1,CHG_H=1, cc capability broadcast is 3A, Google pixel2 charging current is 2A.

    So from this, I think there should be no problem with TPS25810. Is there any possibility that Samsung S8 doesn't support CC broadcast charging(but it support PD)?

    Regards,

    Bob

  • 0 in reply to Umberto Frangi
    TI__Expert 8980 points
    Besides, as we know, most of smart phones in market don't support Type-c broadcast charging although they have type-c port. Such as Xiaomi, Huawei, Nubia and so on, they do have type-c port, but they use BC1.2 or other way to charge, but not type-c broadcast. So it's the reason why I think Samsung S8 don't support type-c broadcast charging.

    Regards,
    Bob
  • 0 in reply to Bob Ma
    TI__Expert 4045 points

    Hi Bob,

     the customer did tests with Samsung S8 and S8+ using other power supplies that implements only USB PD  for example theType C for MacBook or another USB Type-C PD, that does not support Quickcharge. In both case the smartphone negotiates correctly and goes to fast charging , reading the profile supported by the power supply thru CClines.

    The test  done with TPS25810  on all  Xiaomi/Oneplus and Huawei Type-C and all can activate charging in agreement with selected profile.

    But it is important to guarantee we can support also Samsung because it is one of the most sold.

    Is there no way you find a Samsung phone to test and we verify finally the situation?

    Thanks

    Umberto

  • 0 in reply to Umberto Frangi
    TI__Expert 8980 points
    Hi, Umberto,

    Sorry, we can't find a Samsung S8/S9 to test here.

    Our TPS25810 is compliant to type-C standard (pass Ellisys test), it can charge Macbook at 3A advertising speed. In your customer tests, Samsung S8 support type c PD charging doesn't mean Samsung S8 must support type-c advertisement charging. Type-c advertisement charging supply a 5V 1.5A or 5V,3A for device, but PD can supply higher voltage and current up to 20V 5A. These are different, TPS25810 only support type-c advertisement charging, not PD. A phone can support PD charging, doesn't means it must support advertisement charging.

    Is your customer's end product auto USB charger? If that is case, can we put a TPS2514A in parallel with TPS25810?
    In the real case, there maybe type-A phone use type-C to type-A cable.
    If you have a BC1.2/Divider/Samsung mode charger, it can support most of the popular phone in the market.

    Regards,
    Bob