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TPS2514A: TPS2514A issue

Hoi Wa Ip
Intellectual 720 points
Part Number: TPS2514A

Dear TI experts,

We developed a USB wall charger product based on TPS2514A. Below is the schematic for your reference. During production, we are trying to check if the product is working properly by simply measuring the voltage on DP1 and DM1 when no charging device is connected to charger. If voltage appears on both DP1 and DM1 are 2.7V/2.7V respectively, we regard the device under testing is functioning properly. Is this the correct way to verify the product? In fact, we attempted to test a few samples in this way, the voltage appears on both DP1 and DM1  are 2.7V/2.7 respectively. However, we found that there were a couple of samples exhibited quite differently, as voltages appeared on DP1 and DM1 look random. 

Would you please help review the schematic and suggest proper procedures that we should employ to verify our products? Thanks, Peter.    

  • 0
    TI__Mastermind 28520 points
    Hi Peter,

    The TPS2514A supports multiple divider modes.

    I would suggest that you verify functionality by connecting devices that require all three of the supported DCP divider modes as well as the BC 1.2 and e Chinese Telecommunications Industry Standard YD/T 1591-2009.

    I don't have a listing of devices that support these modes, but I believe that there are inexpensive test options to validate all modes.

    Reards,
    Chuck