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INA239: INA239 isolation?

Douglas Lee
Prodigy 30 points
Part Number: INA239
Other Parts Discussed in Thread: TIDA-01608

Hi! 

I was using this IC to sense current, voltage, and power. From the datasheet it looks like it does not have isolation built in to electrically isolate the Sensing pin side from the SPI Data pin side.

Could anyone recommend how to incorporate an easy isolation or another IC that has the same specs as the INA239 for me?

Thank you

  • 0
    TI__Genius 17990 points

    Hello Douglas,

    None of our shunt based current sensors have built in isolation. If you need a device with built in isolation, then you could look into our Hall-effect current sensors, found here: https://www.ti.com/sensors/magnetic-sensors/hall-effect-current/products.html. These are all analog out though, so you may like my next suggestion better.

    If you would still like to use the INA239, then you can add a digital communication isolator, similar to how is done in TIDA-01608 (https://www.ti.com/tool/TIDA-01608), only with an SPI isolator instead of an I2C isolator. Just make sure that the logic thresholds of the isolator you choose are compatible with the high/low logic level of the IAN239.

    Regards,

    Mitch

  • 0 in reply to Mitch M
    Prodigy 30 points

    Hi! If I were to use a hall-effect-current sensor how do I convert the analog to digital so I can send it to a display like an LCD display to read it?

    Also the second link does not open for me.

    Thank you

  • 0 in reply to Douglas Lee
    TI__Genius 17990 points

    Hey Douglas,

    I fixed the link above so that it works now.

    To convert the analog signal to digital you just use an ADC (Analog to Digital Converter). It is likely that your MCU has one built it, but it may not be the resolution you need. In that case you can get separate dedicated device. 

    Regards,

    Mitch