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INA260EVM: Shunt Voltage, Triggered

Takashi Yamaguchi
Genius 13700 points
Part Number: INA260EVM
Other Parts Discussed in Thread: INA260

Hi team,

I have a question about the INA260EVM.

Could you tell me how to set the trigger voltage of shunt voltage?  It seems that there is an alert pin setting. Is the alert pin setting equal to the trigger voltage?  

Regards,

Yamaguchi

  • 0
    Guru 140200 points

    Hi Takashi,

    have you read section 4.1.4 of User guide of INA260EVM?

    Kai

  • 0
    TI__Mastermind 26335 points

    Hello Takashi,

    if you are using the EVM GUI, you can get a triggered shunt voltage measurement as indicated in the series of images below.  You would first click the operating mode text field.  Then select "shunt Voltage, Triggered".  Then click "write All Reg."  Lastly you would click "Read all Reg." 

    The operating mode, "shunt voltage, Triggered" triggers the device to start sampling through a write a command and not a threshold voltage.  Whereas the Alert pin is triggered by a threshold voltage defined in the alert limit text field.  You will need an updated measurement before the device can determine if the alert limit has been crossed. In continuous mode, the update duration is limited by the shunt and bus conversion speed, whereas in a triggered mode, the  update duration depends upon when you send the write all Reg command.

  • 0 in reply to Patrick Simmons
    TI__Genius 13700 points

    Hi Patrick,

    Thank you for the answer. Could you please support the following questions?

    1. Please let me check my understanding just in case.  In trigger mode, the device starts sampling through a write all reg and display it through a read all reg. Is my understanding correct?

    2. Is this GUI not able to use, like an oscilloscope trigger, in which when a certain threshold is exceeded, the current value ( or voltage value) is displayed at that point?

    Regards,

    Yamaguchi

  • 0 in reply to Takashi Yamaguchi
    TI__Mastermind 26335 points

    Hello Takashi,

    1. The gui prompts you to write to all registers.  However, the device does not require all registers be written before triggering.  The only register that needs to be written to is the configuration register.

    2. The gui and device are only triggered by i2c communication. 

  • 0 in reply to Patrick Simmons
    TI__Genius 13700 points

    Hi Patrick,

    Thank you for the answer. For the question #2, please allow me to ask again in another words.

    Customer wants to display on the GUI only when the shunt voltage exceeds a certain threshold voltage. This GUI cannot do that. Is my understanding correct?

    Regards,

    Yamaguchi

  • 0 in reply to Takashi Yamaguchi
    TI__Mastermind 26335 points

    Hello Takashi,

    Your understanding is correct. For triggered mode the alert value for the alert condition needs to be exceeded at the time of the i2c trigger in order for the alert pin to toggle.  As for continuous mode, the device will continuously measure and indicate within a conversion cycle or two when the alert condition was exceeded, while the gui will take longer due to the limits imposed by the software.

    While the gui does continuously update in the continuous mode, your system does not have to operate the same way. If you used a microcontroller, you could program the INA260 to monitor continuously and then only read the registers when the ALERT is pulled low.

  • 0 in reply to Patrick Simmons
    TI__Genius 13700 points

    Hi Patrick,

    Thank you for your support.

    Do you have another GUI lineup that can be connected to the INA260 and can read in a slightly shorter cycle?

    Regards,

    Yamaguchi

  • 0 in reply to Takashi Yamaguchi
    TI__Mastermind 26335 points

    Hello Takashi,

    As of now we do not have another faster reading GUI for the INA260.  However, the microcontroller team might be able to propose something that can help you read and write to the device with minimal programming that may help you read over a shorter cycle.

  • 0 in reply to Patrick Simmons
    TI__Genius 13700 points

    Hi Patrick,

    Thank you for your support.  I have another question about the EVM.

     

    Is it possible to export a current value data which is showed on Graph by Continuously Poll Data to CSV?

    The EVM User’s guide states that “The Graph tool plots the acquired data and exports to a file if necessary”.  Could you tell me how to export the data to CSV?

    Regards,

    Yamaguchi

  • 0 in reply to Takashi Yamaguchi
    TI__Mastermind 26335 points

    Hello Takashi,

    If you want to export the data from the graph, you simply need to right-click on it to bring up the export option.  From what I can tell, my gui did not give an option to export a csv, but it did give the option to export to excel.