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INA226: Limit setting for ALERT

Hidekazu Someno
Expert 5130 points
Part Number: INA226

Hi Team,

This IC has a ALERT function. It is enabled for only one feature selected in the Mask / Enable Register (06h) setting, and the ALERT limit (threshold) for that selected feature is set in the Alert Limit Register (07h).

For example, In case This IC is used in bi-directional current sensing and 80mV threshold(limit) is set for Shunt Voltage Over-Limit(SOL) , I understand hat the 80mv threshold applies to each current flowing in both directions.  Is that okay?

Regards,

H.Someno

  • 0
    TI__Mastermind 32395 points

    Hello Hidekazu,

    This is not how the alert threshold would work. The shunt voltage register stores negative numbers in 2's complement form. Thus if you want to set an alert for a shunt voltage < -80 mV, then you need to program the Alert register with the 2's complement of -80mV.

    Hope this makes sense.

    Best,

    Peter

  • 0 in reply to Peter Iliya
    TI__Expert 5130 points

    Peter-san,

    Thanks for your reply.

    Yes,  I have understood that Shunt voltage register stores negative number as 2's compliment form.

    Please let me reconfirm about your comments.

    Do it mean that we cannot set both positive and negative limits by the setting of the ALERT limit register at once in a bidirectional current application and only one-way limit can be set?

    Regards,

    H.Someno

  • 0 in reply to Hidekazu Someno
    TI__Mastermind 32395 points

    Hello Hidekazu-san,

    Yes. You cannot use one value in Alert register to set two different limit events even when the two limit values are only different in their sign/polarity (e.g., +/-80mV). So when load current is positive then you will need to program INA226 to Alert at +80mV and when the current changes direction, then INA226's Alert register will need to be programmed to -80mV.

    Hope this helps.

    Best,

    Peter