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TS5A22364: Pop noise

Kai Hsiao
Guru 12675 points
Part Number: TS5A22364
Other Parts Discussed in Thread: DRV134

HI Sir 

1. if no signal connect with INx ,what's the default setting of TS5A22364 (NC to COM or NO to COM?)

2. When VCC=0V ,NC or NO pin can't supply negative voltage input ,Am i right?

Thanks

  • 0
    TI__Mastermind 45370 points

    Kai,

    The TS5A22364 does not have a defined state when INX pin is floating.  Please connect the INX pin according to the datasheet recommendation.

    When Vcc = 0V you cannot have less than -6 V  or  greater than 0.5 V on the NC, NO, and COM pins according to the absolute maximum ratings table.

    What are you making that your system has the TS5A22364 without supply but signals present on the signal path?

    Thank you,

    Adam

  • 0 in reply to Adam Torma
    Guru 12675 points

    HI Adam

    So far we use DRV134 have pop noise ,we will like to use TS5A22364 to workaround this issue 

    But when we test TS5A22364 (VCC connect to 5V and NC / NO pin connect to GND) then turn on IN pin (below blue waveform)

    You can see below picture ,the COM pin have a short pulse ,it will have a pop noise (purple waveform)

    Do you have any suggestion ?

    Thanks

  • 0 in reply to Kai Hsiao
    TI__Mastermind 45370 points

    Kai,

    Do you have schematic to share how you think you can use the TS5A22364 device to get around the pop issue with the DRV134?  Why do you ground the NC and NO pins?  That is not a common practice for the TS5A22364 device.  

    Do you have waveforms of the pop without the TS5A22364? 

    What are the green and yellow waveforms?

    The short pulse on the COM pin you are seeing could be due to charge injection when toggling the control logic IN pin.  

    Thank you,

    Adam

  • 0 in reply to Adam Torma
    Guru 12675 points

    Hi Adam

    We test TS5A22364 have pop noise ,do you have any idea about this case

    Step1 : Connect NC1/NO1/NC2/NO2 to Ground
    Step2 : Default INx pull down to GND and turn on 3.3Vcc => have a very small pop noise (can be ignore)
    Step3 : When VCC=3.3 ready and turn on INx from low to high => have a big pop noise 

    Do you have EVM on hand can provide it to me ?

  • 0 in reply to Kai Hsiao
    TI__Mastermind 45370 points

    Kai,

    TI does not make an EVM for this device.  We normally order simple boards like the one below.  You can find them here or through digikey . 

    I can also try and see if I can duplicate the issue on my bench in parallel with you.

    Thank you,

    Adam

  • 0 in reply to Adam Torma
    TI__Mastermind 45370 points

    Kai,

    I took the break out board above with the TS5A22364 and tested in my lab.  I toggled the select pin to see if I could get the pop that you see above.  I was not able to see any issue.  We may need to debug other sections of the system for the source of the pop. 

    Thank you,

    Adam