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TPS2547: No CDP-SDP Auto-switch Functionality

Jackson Carmichael
Prodigy 690 points
Part Number: TPS2547
Other Parts Discussed in Thread: TPS2546

Tool/software:

Hello,

I understand that the TPS2546 implements CDP-SDP auto switch functionality, while TPS2547 does not.

My question is - what implications would the TPS2547 not implementing CDP-SDP auto switch have on a design/system?

Best,

Jackson

  • 0
    TI__Mastermind 24772 points

    Hi Jackson, 

    Thank you for reaching out!

    I will look into this and get back to you by end of week. 

    Best Regards, 

    Aya Khedr

  • 0 in reply to Aya Khedr
    TI__Prodigy 690 points

    Hello,

    Wanted to check back in here and ask - do you have an update on this?

    Best,

    Jackson

  • 0 in reply to Jackson Carmichael
    TI__Mastermind 24772 points

    Hi Jackson, 

    The TPS2546 integrates CDP-SDP auto switch feature in order to ensure that non-compliant phones can communicate data with host controller in CDP mode. These non-compliant phones can only communicate data with host in SDP mode and classify CDP as non-SDP mode and will not communicate data with host, but will draw charging current. 

    However, there are phones that when unpowered, will only do primary detection similar to non-compliant phones. This will trigger the auto-switch and these phones will be charged with only 500mA. 

    The TPS2547 removed the auto-switch feature to ensure phones are charged faster when powered off. 

    Best Regards, 

    Aya Khedr