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CCS: 【Bq76930 Cell Balancing】Wrong duty cycle

Tool/software: Code Composer Studio

Hi ~  here is the problem.

When MCU want to set Balancing channel per 250ms

Some balancing time will disappear.??!!                       Only separate battery will happen.    (Is the cell too lonely so that be lazy?)

Balancing period is 243ms

Command period is 250ms

But It works when I both set CB1 & CB2.   Other Adjacent cells can work too.

because that adjacent cells should not be balanced simultaneously.

I want to balance like below situation

Thanks for your help~~