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CCS/UCD3138: how to calculate blanking time of UCD3138 CBC ?

user5006419
Expert 1795 points
Part Number: UCD3138

Tool/software: Code Composer Studio

BLANK_A_BEGIN =0 ; BLANK_A_END=30;  blanking time = 30*4 =120ns .

The measured value on the oscilloscope is 13.8ns .

I don't know why there are different .

  • 0
    TI__Mastermind 18370 points

    The resolution of BLANK_A_BEGIN and BLANK_A_END bitfields is indeed 4 nS.
    The is always going to be mismatch between the setting and oscilloscope measurement due to internal signal path propagation delays.

    The osciloscope shows the signals at the input of analog comparator, when planking is applied in the DPWM.
    You should try to estimate this delay based on your measurements and place you blanking begin and end accordingly.

    Regards,