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INA236: Respond Speed and the Occupation Time to I2C Bus

Francis Jiang
Intellectual 2000 points
Part Number: INA236
Other Parts Discussed in Thread: INA240, INA296A, INA296B

Hi Team,

I promote INA236 to customer for current sampling, but they concern the respond speed of INA236 and the occupation time to I2C Bus. They think analog sampling will have better performance.

Could you please help me check it? Compare to INA240.

Background:

  • -48V output voltage, 125A load current.
  • 1% current measurement accuracy.
  • Better performance than 12-bit ADC of C2000.

BRs,

Francis

  • +1
    TI__Mastermind 29710 points

    Hello Francis,

    The INA236 has the fastest sampling of 140µS and the alert is compared at each conversion point if an overlimit is the concern for the speed.  Also the VCM is limited from -0.3V to 48V and cannot due -48V unless you do some external configuration to keep the voltages within the max operating conditions. This will also limit the use of the INA240.  If speed is the biggest concern I would go with the INA296B or INA296A depending on the accuracy requirements.  The INA296A gain error is 0.01% while the INA296B is 0.1% and most of the error could come from your shunt resistor. 

    For comparison I would use this calculator for accuracy.  https://www.ti.com/tool/CS-AMPLIFIER-ERROR-TOOL  Even if you use an analog version do they still need to convert through an ADC to use the information or will they use the analog signal.  

    For better performance of the 12bit ADC please give more information on better.  Speed or accuracy and please give the C2000 version to get information on that specific ADC.

    Regards,

    Javier

  • 0 in reply to Javier Contreras4
    TI__Intellectual 2000 points

    Hi Javier,

    Thanks for your prompt reply!

    I would like to further follow this case offline. Thanks.

    BRs,

    Francis