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INA301-Q1: Alert Pin of INA301-Q1

yoshiki hasebe
Mastermind 6385 points

Part Number: INA301-Q1

Dear Sirs,

My customer asked us about Alert pin of INA301-Q1.

My customer's terms of use always pulled Alert PIN to 3.3V.
When VS becomes Open or OFF (0 V) in this state, 3.3 V is applied to Alert Pin.　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　He is concerned about this condition.

Is there a problem with this condition?
I checked the datasheet.
So, I think that it is necessary to be within the specifications as one of the conditions.


Is this correct?

Please let me know above questions.

Best Regards,

Y.Hasebe

  • 0
    TI__Mastermind 27715 points

    Hello Hasebe-san,

    In my opinion, the best recommendation is to pull up the ALERT pin to Vs, so that the pull up goes to 0V when Vs goes to 0V.

    However, the pull-up resistance will limit current sunk by the ALERT output and will prevent damage to the device in your customer's condition. For example, a 10k resistor will limit current to (3.3V/10k) = 330uA. This is well below the abs max limit of 5mA.

    If this answered your question, please click the button "This resolved my issue." Thanks!

    Best regards,

    Ian Williams
    Applications Manager
    Current & Magnetic Sensing

  • 0 in reply to Ian Williams
    Mastermind 6385 points

    Hello Ian-san,

    Thank you for your reply.

    I almost understand your comments.

    Then I have one question.

    I think "abs max limit of 5 mA" is the following description of data sheet.
    Is this correct?

    Also, from figure 33 we can see that it is 5 mA.
    Is this correct?

     

    Please let me know above question.

    Best Regards,

    Y.Hasebe

  • 0 in reply to yoshiki hasebe
    Mastermind 6385 points

    Hello Ian-san,

    I find my mistake about previous question as below.

    This description was about input voltage.

    So, My question is only as blow.

    I think "abs max limit of 5 mA" is the following description of data sheet.
    Is this correct?

    Best Regards,

    Y.Hasebe

  • 0 in reply to yoshiki hasebe
    TI__Mastermind 27715 points

    Hi Hasebe-san,

    The input current limitation of 5mA and the table in Figure 33 are two different things.

    Figure 33 shows the low-level output voltage versus output current for the comparator output, which happens to stop at 5mA. This is similar to the Vout vs. Iout characteristic for an op amp - as the device sources or sinks more current, the min/max output voltage moves further away from the supply rails.

    Best regards,

    Ian Williams

  • 0 in reply to Ian Williams
    Mastermind 6385 points

    Hello Ian-san,

    Thank you for your reply.

    I understand your comments.

    I will explain them to my customer.

    Best Regards,

    Y.Hasebe