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TS5USBA224 - About internal 100kohm shunt resistor

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Guru 21045 points

Hi Team,

 

Our customer would like to know about internal 100kohm shunt resistor.

 

---------------

[Q1]

I’m understanding that this resistors are enabled in ③,④,⑦,⑧ state.

Is my understanding correct?

 

 

------

 

[Q2]

They would like to know the timing to connect this resistors.

My understanding is as follows.

Is my understanding correct?

 

---------------

 

Regards,

Kanemaru

  • 0
    TI__Genius 16510 points
    Kanemaru-san,

    I've verified with design that the shunt resistors are enabled when D+/D- (USB) are on, and the L/R (audio) are off. In the table that you supplied, that would correspond to state 4.

    This makes your graph in [Q2] Incorrect, because it only shows the shunt resistors active in state 3..

    The main take away here is that the shunt resistors are enabled when Audio (L,R) is Off and USB (D+,D-) is on. The table in the datasheet does not list every possible combination.
  • 0 in reply to Jonathan Valdez
    Guru 21045 points

    Hi Jonathan-san,

     

    Thank you for your prompt reply.

    I will report this information to our customer.

     

    Regards,

    Kanemaru