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BQ79616-Q1: One PCBA for all cell configuration

Part Number: BQ79616-Q1
Other Parts Discussed in Thread: BQ79616

Dear TI support,

we're planning to develop a single PCBA to handle all our battery modules(4-16 series connected cells) by using the BQ79616 IC.

The examples on the document SLVAE89 - FEBRUARY 2019, on paragraph 4.3 (fig. 4.6 a..d), suggests some possible configurations but, for the case of our interest ( fig 4-6 (c) and (d) ), it suggest to unpopulate some resistors and capacitors.

Our idea, instead, is to design a single PCB with a single PCBA variant  (a single component assembly option). In case we are going to use less than 16 cell we can short circuit the unused cell inputs to +Vbatt (positive pin of cell 14 in the example below).

Are there some side effect if we use such configuration with the 10ohm,100ohm resistors and the differential capacitors on channels CB populated?

  • Hi Luca,

    Do you have access to the latest datasheet in mySecureSW? There is a figure 10-2 that shows all possible scenarios for this. It is possible to leave the components while connecting different cell combinations, we just show them removed for scenario c to save the customer BOM cost.

    Regards,

    Taylor

  • Hi Taylor,

    thank you for the prompt reply!

    Yes. The image I attached is exactly the figure 10-2 (scenario b) in which I replaced the cells 15 and 16 with a short circuit.

    So in the comment to the figure 10-2(c) can I replace the word "need" with the word "can"  as following?

    "(c) One PCB for all channels applications ± For BQ79616: Configured for 15 VC and CB
    If floating the unused VC and CB pins, capacitors in black corresponding to CB pins need
    to be populated, but capacitors and resistors in grey corresponding to VC and CB pins
    need (canto be unpopulated"

    Regards

    Luca

  • Hi Luca,

    Thats correct.

    Regards,

    Taylor