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INA226: Self measurement?

Kevin Angus
Prodigy 70 points

Part Number: INA226

Can VS be supplied by VBUS?

In that configuration can I measure the INA226?

Thanks

  • 0
    TI__Mastermind 32395 points

    Hey Kevin,

    Thanks for posting to the forum.

    VS can be supplied by VBUS as long as VBUS is always less than 6V, which the Absolute Maximum voltage allowed at Vs pin. In order to monitor the quiescent current (IQ) of IN226, the VS pin needs to connect in parallel with whatever load your may be sensing. So if the load is connected to the IN- pin and your are measuring positive current (Vshunt>0), then Vs also needs to connect with IN- pin. If Vs is connected to IN+ pin in this scenario, then you will not sense this current since it is not flowing across your shunt resistor.

    Best,

    Peter

  • 0
    Prodigy 150 points

    It depends on what else VBUS is connected to. If VBUS can have transients like load dumps, inductive loads, etc., then it'll eventually destroy the ADC, or at least will be progressively degrading its performance. I'd probably not use VBUS if it leaves the board, i.e. if there's a physical connection from VBUS to points outside of the PC-board. Even ESD will be a concern if VBUS leaves the board. It'd take a bit more knowledge about the specific VBUS "environment" to say how good of an idea it would be. Meeting the absolute voltage limits statically across the operating temperature is the basic requirement too, of course.