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Original question:

BQ79616-Q1: BQ79616 can support BQ79616 x 3 cascade for three 16 cells pack hot plug?

BQ79616-Q1: Maximum chain count with BQ79600-Q1

Sreehari Jayaprakash
Prodigy 10 points
Part Number: BQ79616-Q1
Other Parts Discussed in Thread: BQ79616, BQ79600-Q1

Tool/software:

How many devices can be chained when using BQ-79600-Q1?
I understand that since the device adress of each of the BQ79616-Q1 is of 8 bits, the device would support upto 255 devices. But in some forum posts its mentioned that:
"Each of our BQ79616 can manage up to 16 cells (80-V max). With our EVMs, you can have up to 35 BQ79616EVM modules stacked, for packs up to 560 series cells."

  • What is the reason for this limit, Is this only with TI's EVM Boards?
  • What considerations are to be made when designing boards for larger chains?
  • +1
    TI__Prodigy 705 points

    Hello, 

    The device address of each BQ79616-Q1 device is 6 bits, therefore supports up to 64 devices. The previous forum post discusses only the EVM stack size.

    Future Considerations:
    For both the BQ79616-Q1 and BQ79616EVM, the device limit of 64 and 35, respectively, would be decreased by 1 if using a bridge device such as the BQ79600-Q1, as it would use the device address 0x00.
    It's also recommended to protect against cable breaks between devices, especially with longer chains, by using a redundant ring architecture. More information on this can be found at the BQ79616-Q1 datasheet.