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BQ4050: BQ4050 Battery Status bit 13 set to 1

ke huang
Intellectual 310 points
Part Number: BQ4050

Hi Ti experts,

I meet a issue about bq4050.

I make a 4S battery,the gasgauge is BQ4050. 

 BQ4050 Battery Status bit 13  is RSVD, normally is 0, but i find that   BQ4050 Battery Status bit 13  is set to 1.but the TRM is not any information about Battery Status bit 13.

Because the battery charger IC is LTC1760, the charger ic will read  BQ4050 Battery Status bit 13, if set to 1, the charger IC will not charging the battery.

could you help to confirm why BQ4050 Battery Status bit 13 set to 1?what events will cause BQ4050 Battery Status bit 13  set to 1?

Thanks