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TPS389006-Q1: Monitoring 12V battery by resistor divider

Kenneth Lee
Intellectual 1718 points
Part Number: TPS389006-Q1

Tool/software:

Hello Team,

My customer wants to monitor 12V car battery input voltage with TPS389006-Q1.

However, the input voltage range is limited up to 5.5V for this device.

Could they use resistor voltage divider on 12V to drop voltage to the acceptable range?

What resitance range can be recommended not to impact voltage monitoring accuracy?

Thank you in advance. 

  • +1
    TI__Expert 4140 points

    Hi Kenneth,

    Thanks for your question!

    Yes, a resistor divider is recommended to drop the 12V to the acceptable range.

    The resistance range can be chosen by the customer but please keep in mind the accuracy ratings shown below:

    In general, it is recommended to stay within the 1x scale when an external resistor divider is used like in this application as it is more accurate than 4x scale sensing.

    In the past, we have seen customers center the threshold around 1V nominal.

    I hope this helps!

    Best Regards,

    Andrew Li

  • 0 in reply to Andrew Li
    TI__Intellectual 1718 points

    Hello Andrew,

    O.K! Thank you for your help.

  • 0 in reply to Kenneth Lee
    TI__Expert 4140 points

    Hi Kenneth,

    I'm glad this helped!

    If you have no further questions, I will close this thread. To reopen this thread simply respond to this comment.

    Best Regards,

    Andrew Li