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UCD9081EVM: enable active high vs active low

Sean Rauchfuss
Intellectual 935 points
Part Number: UCD9081EVM
Other Parts Discussed in Thread: UCD9081

Posting for a customer:

 

We have a design using the UCD9081. A short program was created using the EVM SW which would set an active high Enable when the monitor input is 1.1v.  The behavior we see in the lab is that the active low box needs to be checked in order to get the enable 1 output to go high. Below is the circuit and program. Can you shed some light on why this seems to be working opposite to what we would expect?



 

Thank you!

 

  • 0
    TI__Guru 60800 points
    Could you please provide the complete configure file? does the configure file work expected on TI 9081 EVM?
    Thanks
    Yihe
  • 0 in reply to yihe
    TI__Intellectual 935 points
    Yihe,

    I just emailed you the par file internally.

    The configuration file did not work until the “active Low” check box was selected. The Enable was measured as a high output which turned on the LED.

    Thanks,
    Sean
  • 0 in reply to Sean Rauchfuss
    TI__Guru 60800 points
    Hi Sean
    When None is selected for Sequencing condition, it means that the rail shall not start at all, therefore the EN output is reversed of what configured to prevent the accidently turn on the rail. If customer wants to turn on the rail, None shall not be used at all, it shalluse other three settings for Sequencing Conditions.
    Hope this help your customers.
    Thanks
    Yihe