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Original question:

BQ34Z100 for more than 16 cells

BQ34Z100-G1: Max number of series cell

Jack Shen2
Expert 4515 points
Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQ34Z100, BQSTUDIO

Hi 

I have an application which uses 105 series cells and I would like to check if I can use bq34z100 for the gauging purpose.

I looked up the TRM and the max value of the number of series cell in data flash is 100. Does that mean bq34z100 only support up to 100 series cells? 

If bq34z100 can support 105S application, then is there need to be aware of when using the bq34z100 in high cell count application? Thanks.   

  • 0
    TI__Guru 57697 points

    Hello Jack,

    Maximum voltage supported is 65V. The 100 series cell limit is when used beyond 65V as  a special setup. Above this value, the firmware is not guaranteed to work reliably.

  • 0 in reply to Shirish
    TI__Expert 4515 points

    Hello Shirish, 

    Thanks for the support. 

    There was an application note "bq34z100-G1 High Cell Count and High Capacity Applications" to guide the users how to configure the hardware and data flash to go beyond 65V. 

    From one of the sections in this application note, it seems like the gauge will still work in this type of setup. Would you mind to double check if the max cell can go up to 105S? Thanks. 

  • +1 in reply to Jack Shen2
    TI__Guru 57697 points

    Hello Jack,

    The gauge will work above 65V with special considerations like in the application guide. If all considerations in that document are met, then you can use it with >65V. The 100V limit is a recommendation.

    If you are convinced that a cell count of >100 should work or if you want to try it out, it is possible by bypassing bqStudio validation. The firmware itself does not restrict the value that can be written, but values outside the recommended range may cause unintended behavior of firmware.

    You can write to the data memory locations using the advanced comm tab in bqStudio by sending the commands to write data flash. These commands are published in the TRM. Make sure to read data memory out to verify that the write operation completed properly.

  • 0 in reply to Shirish
    TI__Expert 4515 points

    Got it. Thanks for the reply.