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Original question:

BQ76952: BQ76952

BQ76952: 14S battery connection method?

jmyang
Expert 1166 points
Part Number: BQ76952
Other Parts Discussed in Thread: BQSTUDIO

Hello,TI experts.

I am designing a 14S battery,The connection is carried out in accordance with TI specifications, but I found that this connection method will cause the static power consumption of the cell 13 to increase.cell 13(8uA), cell 12(1.5uA), cell 11S(1.5uA)...

        bq76952-14S-2021-4-12

  • 0
    Expert 1166 points

    Hello, TI experts.
    I am designing a 14S battery, The connection is carried out in accordance with TI specifications, but I found that this connection method will cause the static power consumption of the cell 13 to increase. cell 13(8uA), cell 12(1.5uA), cell 11S(1.5uA)...

  • 0 in reply to jmyang
    Expert 1166 points

     In order to solve the problem of large difference in static power consumption between VC13, VC12, VC11...
     I connected VC14 and VC15 to VC16 and found that the static power consumption of VC13 has become 1.5uA, which is the same as VC12, which makes me excited.
    Excuse me, can I connect like this? Is it allowed to connect VC14, VC15 to VC16?
  • 0 in reply to jmyang
    TI__Guru* 80963 points

    Hi JM,

    Table 16-3 in the device datasheet describes how to connect unused pins. For the VCx pins, there must be a battery cell connected on VC16-VC15, on VC2-VC1, and on VC1-VC0. All other VCx pins can be shorted as needed.

    So for this example, I suggest connecting VC13,VC14,VC15 together. 

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Expert 1166 points

    Hi Matt，

    Do you mean that VC16&VC15， VC2&VC1,  VC1&VC0 must be short-circuited? 

    No matter what the number of strings? 

  • 0 in reply to jmyang
    TI__Guru* 80963 points

    Hi JM,

    No, these are the pins that cannot be short-circuited. There must be a cell connected between VC15 and VC16. The same is true for VC1/VC0 and for VC2/VC1. 

    Any other inputs can be shorted to each other. 

    Matt

  • 0 in reply to Matt Sunna
    Expert 1166 points

    Hi Matt，

         I understand what you mean,  in order to average the power consumption，the schematic diagram VC12&VC13 is short-circuited, VC14&VC15 is short-circuited, and then is it possible to configure this on bqstudio?

        

        

         

  • 0 in reply to jmyang
    TI__Guru* 80963 points

    Yes, this looks correct.

    Best regards,

    Matt