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TPS2546: different device with different discharge operation from S0 to S5

Ann_Lien
Genius 14430 points
Part Number: TPS2546

Hi expert,

My customer has a question about discharge operation for TPS2546.

They tested 3 conditions and result is shown as below. Mode change = CDP to DCP_auto (CTL1= H->L, CTL2/CTL3/ILIM_SEL/EN= H)

  1. no device on connector -> VBUS drop for 2.X seconds
  2. connect keyboard or mouse -> VBUS will keep 5V, no drop.
  3. connect cell phone -> VBUS drop for 2.X seconds.

May we know why is there different operation with the same setting? Thanks a lot!!

Best regards,

Ann Lien

  • 0
    TI__Mastermind 32751 points
    In case 1, no load is detected, so the device will discharge the bus. ~2 seconds is able the time it should take to discharge the bus.
    In case 2, there is a load present and the Sleep-Mode Charging detects the mouse this and keeps the bus alive
    In case 3, the data lines are disconnected and the phone must be disconnecting the load based the cable disconnect from the data lines being disconnected by the TPS2546. The behavior here is based on the Phone, not the TPS2546.
  • 0 in reply to Chuck Branch
    Prodigy 20 points
    Hi expert,

    This is PEGA EE Kenneth, Could you help to tell more detail about case 2?
    Is mouse trigger TPS2546 into the Sleep-Mode Charging ?
    What conditions will make TPS2546 into Sleep-Mode ?

    What's the behavior of VBUS If we connect with usb flash?

    Thanks
    Kenneth
  • 0
    Prodigy 20 points
    Hi expert,

    This is PEGA EE Kenneth, Could you help to tell more detail for case 2?
    Is mouse trigger TPS2546 into the Sleep-Mode Charging?
    What conditions will make TPS2546 into the Sleep-Mode?

    What's the behavior of VBUS discharge if we connect with USB flash?
    Mode change = CDP to DCP_auto (CTL1= H->L, CTL2/CTL3/ILIM_SEL/EN= H)

    Thanks
    Kenneth
  • 0 in reply to Kenneth Lu
    TI__Mastermind 32751 points
    Case 2 is very well described in section 8.3.6.1 of the datasheet.

    The VBUS output will be discharged on a mode change from 1111 to 0111