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LSF0102: About input sequence on Vref_A/Vref_B/EN

Tao_2199
Genius 5740 points
Part Number: LSF0102

Hello,

 

Regarding to input sequence of Vref_A/Vref_B/EN on LSF0102, my customer is asking a question.

(Question)

Do these inputs need to take care the sequence? Or not take care?

 

Regards,

Tao2199

  • 0
    TI__Mastermind 45145 points
    Hi Tao,

    There are no power sequence requirements for the LSF family. The EN should be low during power up or power down to ensure a high impedance state.
  • 0 in reply to Dylan Hubbard
    Genius 5740 points

    Hello Dylan,

     

    Thank for reply.

    I have informed your answer to my customer and have additional two questions.

    (Question)

    ･The EN input circuit is designed to be supplied by Vref_B.

    When EN and Vref_B are supplied at same time, is there any problem on device?

    ･Regardless to EN status, before power up (Vref_A or Vref_B) the status of A and B are high impedance.

    My understanding is correct?

     

    Regards,

    Tao2199

  • 0 in reply to Tao_2199
    TI__Mastermind 45145 points

    Hi Tao,

    From the block diagrams in the datasheet you can see that we recommend connecting the EN pin to Vref B to properly bias the device, so no there are no issues with that. When the supply pins are at 0V, the A and B ports are high impedance. I am linking our Logic Minute videos over the LSF device  below. I encourage you to watch them as they will be very helpful in understanding the operation of this device.

    https://training.ti.com/TLM-LSF-Bias?cu=1134826