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TMS320F280049C: Using OSDETECT to discharge a capacitor

O.H
Mastermind 6830 points

Part Number: TMS320F280049C

Tool/software:

Hi experts,

Is it okay to use the open/short detection circuit (OSDETECT) to discharge the charge currently stored in the ADC sampling capacitor?
If you have any anticipated problems or past examples, please let me know.

Best regards,
O.H

  • +1
    TI__Expert 3350 points

    Hi,

    Theoretically, it is okay to use the open/short detection circuit (OSDETECT) to discharge the charge currently stored in the ADC sampling capacitor. I haven't tested out practically myself kor seen anyone done so far.

    F28004x ADC does not have the feature to discharge the sample and hold capacitor to 0 so one option is to alternately convert signal (GND or VREFLO) and the circuit being sampled. This means to alternate conversion between an 0v signal and the actual signal. Which basically ensures that the SH cap charges to 0v on the first conversion cycle and on the next cycle, SH cap charges to the signal level of the circuit being sampled.

    Thanks,
    Susmitha

     

  • 0 in reply to Susmitha Bumadi
    Mastermind 6830 points

    Hi,

    Sorry for late reply. Thank you for your answer.

    I understood. We will thoroughly test it before using it.

    Best regards,
    O.H