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BQ78350: Some queries about configuration of bq78350R1 : chemical-ID, QMAX, CEDV coefficients and learnning cycle.

Part Number: BQ78350
Other Parts Discussed in Thread: BQ76920,

I want  to use bq78350 and bq76920 to  design a gauge.

I  have read the use's manual of  bq78350,  but  I  have  some queries:

1、My battery  model  is NCR18650B which is a LiCoO2 battery.  Do  I  have to  change  the  chemical  ID?

2、bq78350  don't have a parameter of Q-max, should I configure  parameters  of  Design capacity mAh and  Design capacity cWh?

    What does  the unit cWh mean?

3、Should  I  have to  update  coefficients   used  for  the Compensated End-of-Discharge Voltage (CEDV) gas-gauging algorithm ?

4、When I use  bq27411,I  have to complete a learning cycle before  I  export  the production files,

Does a learning cycle also  required for  bq78350? If so, how can I  do  it?  And  how can I export  the  .srec file?

  • hi Feiyue,
    Please go thru the document www.ti.com/.../slua726a.pdf as it addresses all your questions
    for instance #1 ➙ 2.3 Gas Gauging
    The bq78350 default configuration supports a 4400-mAh LiCoO2 battery with a chemical ID of 1210. This is a generic setting that allows for some evaluation. For accurate gas gauging, the Chemical ID needs to be updated.

    Best regards,
    David