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BQ25672: ADC Averaging

Nicholas Carley
Genius 9885 points
Part Number: BQ25672

Tool/software:

The datasheet is pretty sparce on this feature and how it works, is there a more detailed overview of this?

  • 0
    TI__Guru**** 165786 points

    Hi Nicholas,

    The charger only has two registers prev value, stored in readable ADC register, and new value, output of ADC.  Running average = (prev value + new value)/2 -> "new" prev value.  ADC_AVG_INT bit determines whether or not to clear prev value before averaging.  With a one-shot measurement, that is okay because the ADC automatically clears prev value and then takes 2 new measurements for averaging.  With continuous measurement, the first measurement could be too low by 1/2 if the prev value is first cleared to 0. 

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Intellectual 350 points

    So then this is a simple 2pt averaging on all (active) ADC regs? Is there a power penalty for enabling this?

  • 0 in reply to Peter Schmuckal
    TI__Guru**** 165786 points

    Hi Peter,

    I am not aware of power penalty.  In fact, I am looking at it right now on the bench and I don't see a significant difference in HiZ Iq when either single or running average is enabled.

    Regards,

    Jeff