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Why device(bq20z75)can not enter shutdown mode when enter 0x0010 in the manufacture access?

Hi,TI Experts!

   Why device(bq20z75)can not enter shutdown mode when enter 0x0010 in the manufacture access? If I turn off the mosfet via 0x46 register first,then I enter 0x0010 in the manufacture access,it can enter ,Why?