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TIDA-01606 sampling issue

Yale Li 李耀先
Expert 4660 points

Hi Team,

In this reference design, what voltage range is sampled? How many bits of precision are used by the on-chip ADC?

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Thanks & Regards

Yale

  • +1
    TI__Expert 3270 points

    Hi Yale,

    we are currently sampling with 12 bit the voltages. The range for the voltage A for example is +- 450 V. This measurement is centered with respect to 1V65.

    Thanks

    Best Regards

    Riccardo

  • 0
    Prodigy 10 points

    Hi Team,

    Thank you very much for your answer. The voltage collection range has solved my doubts. But I found in your reference design that the ADC pin in 28379Dx is connected to a 22uf capacitor. According to the chip manual, it is a 16 bit A/D precision conversion.

    Thanks&Regards

    LIU

  • 0 in reply to Riccardo Ruffo
    TI__Expert 4660 points

    Hi Riccardo,

    Thanks for your reply!

     <-- This is the customer who asked these questions. We very much look forward to your further answer.

    --

    Thanks & Regards

    Yale

  • +1 in reply to lcdreamsky
    TI__Expert 3270 points

    Hi Liu,

    I was trying to look to the pins that you mention for voltage measurement and I have not found any charging bucket having 22 uF. I have looked in available schematic on TI.com and the caps is 100 nF. Is it kindly possible to provide me the number of the cap (e.g. C63)? So I can identify this big cap.

    I have looked down at the code level and currently we are using a 12 bit conversion which is more than enough for this application. The error that you are going to do in the voltage measurement is 0.22 V which is negligible if you consider that these voltages are just used for feed foward in current loops and PLL.

    In general, the ADC of 28379D can be configured as a 12 bit.

    Thanks

    Best Regards

    Riccardo

  • 0 in reply to Yale Li 李耀先
    TI__Expert 3270 points

    Hi Yale,

    I have answered below.

    Best Regards

    Riccardo