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INA233: Asking for INA233 convertion ready bit

SHH
Mastermind 32146 points
Part Number: INA233

Hi Team,

Customer DIN INA233 and custoemr test the load changing from 30W to 50W in quickly changing by e-load

However, customer feedback they will read three step 30Watt, 45W and 50W values. (MCU polling the power register per 30ms period)

customer is wondering the value is still converting, so they did not get the right value.

Would you please provide suggestion on how to resolve this issue? conversion ready bit can used for this case?

BR,

SHH

  • 0
    TI__Mastermind 34060 points

    Hi SHH,

    Any reading between 30W and 50W can be expected in described situation. The reason is exactly what you alluded to – the conversion might be still on-going.

    The conversion ready bit can be used to indicate the completion. By using this bit to synchronize with external load, customer will get consistent measurements that agree with real load. However please keep in mind that in real world applications, load is inherently asynchronous.

    Regards, Guang

  • 0 in reply to Guang Zhou
    TI__Mastermind 32146 points

    Hi Guang,

    Thanks for feedback. Can you please provide and flow chart on how to use the ready bit to avoid this situation?

    BR,

    SHH

  • 0 in reply to SHH
    TI__Mastermind 34060 points

    Hi SHH,

    Load is generally asynchronous to device operation. Since you ask for a flow diagram, I assume you have a choice when such load is applied, then the process can be something like this in triggered conversion mode:

    Start conversion -> Check READY bit -> read when done -> change load if want to -> go back to start conversion.

    However a more realistic implementation is to read multiple times, and discard the transient ones. This will not need to involve the conversion ready bit and the device can still be configured in continuous conversion mode.

    Regards, Guang