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INA3221: Design check

Vishnu
Prodigy 120 points

Part Number: INA3221
Other Parts Discussed in Thread: INA4230, INA4235

Tool/software:

Hi Team,

I have unused channel in this design, I have kept IN+3 pin floating and connected unused IN-3 pin to the used channel. Please confirm if this correct.

In datasheet above descriptions were mentioned. Please confirm whether the design is correct.

  • 0
    TI__Mastermind 30915 points

    Hello Vishnu,

    Yes, this is the correct way to do this. Also, as an FYI, we recently released some newer 4 channel devices, the INA4235 and INA4230. I realize you only need two channels, but these devices have some additional features that you may be interested in.

    Regards,

    Mitch

  • 0 in reply to Mitch M
    Prodigy 120 points

    Thank you for the response mitch.

    I have some more questions

    1. Can you also check and confirm whether all other connections will work.

    2. I have tied VPU to 3V3, is that correct?

    3. The max Vshunt is only 163mV, but we wanted to sense 0.8 Vcore in channel 1, will this work?

  • +1 in reply to Vishnu
    TI__Mastermind 30915 points

    Hello Vishnu,

    Here are my responses to your questions:

    1. Yes, the connections all look good. I will note that a 1KΩ pullup resistor for the I2C lines seems a little high. If you are communicating slow or have other pullups elsewhere then this will still be fine.

    2. Yes, that is fine to do.

    3. The 163mV is for the maximum measurable difference between IN+ and IN-. The common mode voltage can go up to 26V, so 0.8V will definitely be fine.

    Regards,

    Mitch