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TRS3221E: TRS3221EIPWR

Lily You
Prodigy 30 points
Part Number: TRS3221E
Other Parts Discussed in Thread: TRS3221,

QEM-CCR-2306-00760_TRS3221EIPWR

Need more information and discussion about bench test.

  • 0
    TI__Guru 52412 points

    Lily,

    We already have an ongoing email chain - please continue the discussion there - there is no reason to open an e2e thread on a topic where we have multiple interested parties already included on the email chain.

    Best,

    Parker Dodson

  • 0
    Prodigy 10 points

    TRS3221.pptx
    안녕하세요 로트 결함 사용 중 TRS3221 부품
    사용 중 발생 백업

    이 필요합니다 필요한 데이터를 확인하십시오

  • 0 in reply to choi jung ho
    Guru 317320 points

    The TRS3221E behaves correctly; a low level at the TxD input results in a high voltage at the RS-232 output. The device shown begins to work at a lower supply voltage than the other other devices.

    The idle state of a UART signal is high. So the TxD input should be high; is there a pull-down somewhere?
    Alternatively, pull EN or /FORCEOFF low to disable the outputs during power up.

  • 0 in reply to choi jung ho
    TI__Guru 52412 points

    Hi Choi,

    I am sorry for the delay - I was out of office the last couple days. 

    I think Lily is going to loop us all into an email - as I am going to be running tests when I receive the units that they have ran through our ATE program and I may have some questions throughout and it may be easier to not communicate on a public forum.  We should be able to continue communication through email - as there are also a couple other engineers on the list who may have some additional feedback as well. 

    That being said - I don't think there is anything particular wrong here. Each device seems to recognize the input at DIN at a different time in its VCC ramp up - the one that is causing the false start bit is because a  low at DIN will result as a high on DOUT. There are two different dies for this device - so it is possible for this specification to be different between parts - and us not knowing as we don't directly specify this.  I believe I will be testing some of the material and I will be able to more or less confirm this - but I don't think anything is particularly wrong at this point.

    Best,

    Parker Dodson