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INA228: Remote voltage sensing

Stuart Hodge
Prodigy 10 points
Part Number: INA228


Tool/software:

Hi -

I am working with the INA228 but I really would like to remote sense the voltage.  I'm sensing current in the load path but the source in on the other side of a few inches of wiring (not always the same wiring).  Is there a way to do this with the INA228 or another digital sensor (with the same precision) that would allow remote sensing?  I'm thinking - tie to local sense with a small resistor - maybe 10 ohms, and then the remote sense would shunt that resistor out. 

My application requires precision efficiency measurements of the UUT.  Any help or pointers in the right direction would be appreciated.

Thanks,
Stu Hodge

  • 0
    Guru 318050 points

    I²C can handle a few inches.

    If you cannot place the INA228 near the measurement resistor, then treat the IN+/IN− lines as differential signals (route them together, as twisted pair if in a cable) so that noise will be common-mode (the INA228 has a high CMRR).

    I do not understand what that "local sense" is or why you would want to add it.

  • 0
    TI__Mastermind 34830 points

    Hi Stu,

    I agree with what Clemens said. You don’t need to put INA228 right there at the load, nor the I2C bus needs to be particularly short. There is flexibility when it comes to part placement.

    Regards

    Guang