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TPS2546: Status issue

user4979999
Prodigy 690 points
Part Number: TPS2546

Hi Team,

Please check customer questions below, thanks.

1. From Status# S0(With device) into S3/S4/S5, the TPS2546 pin9 will be low-->high and keep high. Is that correct?

2. If I changed the ILIM_LO resistor from 49k to 2Mohm, then when Status# S0(With device) into S3/S4/S5, 

TPS2546 pin9 will be low-->high-->low. Is that correct?

3. From datasheet, the resistor range is 16.9K~750K, is that ok to put 2Mohm?

4. When I put ILIM_LO resistor=49k, and do Status# S0(With device) into S3/S4/S5, why pin9 STATUS can't be low?

 

Regards,

  • 0
    TI__Genius 9630 points

    Hello,

    Please see my answers in red below: 

    1. From Status# S0(With device) into S3/S4/S5, the TPS2546 pin9 will be low-->high and keep high. Is that correct?

    STATUS is active low, so when there is not an attached device, STATUS will be high. When there is a connected device is detected, STATUS will be low. See Table 3 for which charging modes offer the STATUS output. 

    2. If I changed the ILIM_LO resistor from 49k to 2Mohm, then when Status# S0(With device) into S3/S4/S5, TPS2546 pin9 will be low-->high-->low. Is that correct?

    RILIM_LO must be set in the range listed, between 16.9k and 750k, if you want to use load detection. 

    3. From datasheet, the resistor range is 16.9K~750K, is that ok to put 2Mohm?

    See above answer.

    4. When I put ILIM_LO resistor=49k, and do Status# S0(With device) into S3/S4/S5, why pin9 STATUS can't be low?

    What CTL inputs do you have? Please check the Table 3 in the datasheet to ensure this mode offers STATUS output. 

    Thanks,

    Emma

  • 0 in reply to Emma Hoying
    TI__Prodigy 690 points

    Hi,

    Customer has more questions below, please check. 

     

    1. When they connect different load device, they will see the STATUS high time is different, they feedback the CTL1~ILIM_SEL level in the third waveform. We should ask them to check the load current level to see if it hit the threshold and change the STATUS pin? They wonder why in the 0111 stage, will see STATUS high and then later keep low?

    Device1: Android phone (3.16s)

    Device2: iphone 12  (2.3s)

     

     2. When they change S0 to S3 mode (1111 to 0111), they will see pin12.Vout level will sudden drop and recover, is that normal behavior? Is that VOUT drop related to STATUS change?

    Thanks!

  • 0 in reply to user4979999
    TI__Genius 9630 points

    Hello,

    1. The STATUS pin uses the ILIM_LO resistor for low current-limit threshold and the load detection current threshold. The STATUS pin is asserted in load detection conditions so the resistor being used for ILIM_LO could be playing a part in why STATUS is on the boarder of being asserted. Depending on where the connected device is in its charging period, it will be pulling different amounts of current which will assert/deassert STATUS. It is up to the setting of the ILIM_LO resistor to decide what current level should assert STATUS. 

    2. The VBUS/VOUT drop is not related to STATUS. When the TPS2546 changes modes, VBUS is discharged so that the connected device can go through the proper enumeration so that it can be in the correct mode. When VBUS is discharged, STATUS will go back to not being asserted. This is expected behavior. 

    Thanks,

    Emma

  • 0 in reply to Emma Hoying
    Prodigy 70 points

    Hi Emma

    I have the questions below

    Could you please check product result meets the customer's require mode again for me?


    as follows table customer require


    as follows table is product check result

    truth table sequence:CTL1→CTL2→CTL3→ILIM_SEL

  • 0 in reply to Willy Hsu
    TI__Genius 9630 points

    Hello,

    I am not sure what this table means? Can you clarify what you would like me to check?

    Thanks,

    Emma

  • 0 in reply to Emma Hoying
    Prodigy 70 points

    Hi Emma

     

    Sorry, probably I didn't explain it clear enough and caused your misunderstanding.

     

    Customer require charging mode below table

     

    If follow  TPS2546 SPEC table

     

    Do you know how to do control pin settings matched ?

  • 0 in reply to Willy Hsu
    TI__Genius 9630 points

    Hello,

    Table 2 will help you match the system global power states and there is not necessarily a difference to having w/ device and w/o the device so you can take that out of the table. 

    Thanks,

    Emma