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bq769x0 max Capacity

Natallia Holubeva1
Expert 6550 points

Hello,

What is the max capacity for this BQMaximo? It is clear that it will work for 3-15 series, but why there is no capacity characteristic in the datasheet? I mean mAh.

Thanks a lot!

  • 0
    TI__Guru 54715 points

    The bq769x0 is an AFE and as such does not know capacity.  The sense resistor must be selected to keep the sense inputs in their dynamic range over the current range of interest, both for protection levels and for the CC measurement to keep the value in range to prevent saturation at high levels and above some comfortable noise level at the low input levels of interest.  This compromise will vary with the system design.

    The bq769x0 integrates over the 250 ms window, so the MCU which collects the CC readings will convert the mV values into current and current x time (mAh).  The capacity of the system then depends not only on the sense resistor and integration time but also on the MCU's variable size for the capacity.