• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 49 subscribers
  • Views 451 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

INA139: Negative voltage detection method

Shinichi Inoue
Guru 19641 points
Part Number: INA139

Dear Specialists,

My customer is considering INA139 and has a question.

I would be grateful if you could advise.

---

We're considering  to apply 0V to pin 5 (V +) of INA139 and -12V to pin 2 (GND) to output a negative voltage.

After that, a comparator is inserted in the subsequent stage to convert it into a logic level signal.

Is there any problem with this usage?

We have already mass-produced INA139 for the + power supply side, and there is no particular problem.

At this time, there is a negative power supply detection application in a new project.

We want to confirm that INA139 can be used as well.

---

I appreciate your great help in advance.

Best regards,

Shinichi

  • 0
    TI__Mastermind 21670 points

    Hello Shinichi,

    Thank you for considering to use Texas Instruments.  Our device's absolute maximum ratings correspond to the potential between a given pin and the device ground. Looking at your schematic with your device ground set to -12V, the potential to the supply pin and input pins is 12V, which falls within the abs max range and recommended operating range.  Therefore, I do not think you should have any problem with using the INA139 in your configuration.

  • 0 in reply to Patrick Simmons
    Guru 19641 points

    Hi Patrick,

    Thank you for your reply.

    I understand there was no problem with the customer's circuit.

    I'll share your answer with the customer.

    I appreciate your great help.

    Best regards,

    Shinichi