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BQ76940: Stack 2 x BQ769x0 together

Patrick Chan
Prodigy 30 points
Part Number: BQ76940
Other Parts Discussed in Thread: ISO1541, TIDA-01093

hi,

i just completed the single bq76940 prototype and presented to our customer, now i am also interested to stack 2 bq76540 or 76530 together for more than 15 cells lipo management, i understand the suggestion of using ISO1541 for 2 stacked bq769x0 communication, however for upper bq769x0 CHG and DSG pin i have no idea how to connect with lower CHG and DSG together for SCD or OV protections.

could you help ? your help in this matter is greatly appreciated.

patrick.

  • 0
    TI__Guru 54715 points
    Hi Patrick,
    While the bq769x0 parts are not designed to be stacked, as you note the ISO1541 allows isolating the communication path for the voltage offset for the upper device. Other isolators or level shifters could be used to transfer other signals across the voltage difference. You might look at www.ti.com/tool/TIDA-01093 for an example of combining outputs from 2 bq76930s, this concept should be workable for other combinations of the bq769x0 family.
  • 0 in reply to WM5295
    Prodigy 30 points
    excellent information, that's what I want !

    I have a question about schematic of tidrnc5, the VC5X_U on page 2. and VC5X_B on page 3 look something wrong ? e.g. the VC5X_B under C18 is short with VC5 ?
  • 0 in reply to Patrick Chan
    TI__Guru 54715 points
    Hi Patrick,
    The connection dots overlap and make it look like the nets are shorted when they are not, and this can be confusing. For example on page 2 VC5X_U connects to C65 and C66 but not to the components/net with VC5. If you download the CAD files and can view or edit the schematic it is more apparent.