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BQ76907: Inquiry Regarding BQ76907 Current and Coulomb Counter Readings.

Tom Tsao
Expert 1420 points
Part Number: BQ76907
Other Parts Discussed in Thread: BQ76920,

Tool/software:

Hi TI Support Team,

For BQ76920, it stated coulomb counter(CC) reading is ready in every 250msec, when CC_READY bit is set, it shows new reading is available.

 

BQ76920

 

What about BQ76907? How to know CC reading is available? There is no register/bit to indicate the current reading is completed?

The specs only states CC1(0x3C) generates samples every 250msecs, what about CC(0x3A)?

 

BQ76907

Am I right to conclude both Current(0x3A) and CC1 Current(0x3C) value(mA) is computed using the same raw current(0x36)?

So which register to use for reading current, 0x3A or 0x3C?

And what is the difference between 0x3A and 0x3C?

Thanks!

  • 0
    TI__Mastermind 24330 points

    Hi Tom,

    There is not a CC READY feature on the BQ76907. The CC does not include a 1 shot mode, so it was deemed unnecessary to include.

    0x3A and 0x3C are generated from the same ADC readings, however they have different post processing applied to them.

    0x3A has a faster sampling rate but is more susceptible to noise because of that. 0x3C has a longer integration time and thus is less susceptible to noise. Depending on your use case you may need quicker data refresh rates (0x3A) or more noise immunity (0x3C). It's up to the system designer which they want/need to use.

    Regards,

    Max Verboncoeur