• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 47 subscribers
  • Views 666 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

INA226 Negative and Positive voltages with common grounds

INA226: INA226 does not work for negative voltage current measurement

Hari Rathod
Prodigy 20 points
Part Number: INA226
Other Parts Discussed in Thread: TIDA-00313

Tool/software:

I have a design using two INA226 to measure +12V and -12V and a common ground. For negative bus, I have left the VBUS connection open, and I am trying to measure the shunt voltage.

The IC responds to all commands before negative voltage is applied to shunt resistor. As soon as the negative voltage is applied, there is no response from the IC.

I have read the TIDA-00313 reference design. Do I need a isolator when working with negative voltages?

Thanks

  • 0
    TI__Mastermind 26745 points

    Hello Hari,

    Thank you for using the TI forum. You are correct that you will need some isolation, similar to TIDA-00313, when using negative common mode voltages for the INA226, since the input cannot handle negative voltages. I will note that if you follow TIDA-00313 that you will not need the voltage divider on the VBUS pin, since 0V - (-12V) < 36V..

    Regards,

    Mitch