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BQ27421-G1: GPOUT

Part Number: BQ27421-G1

I have some quetions in below.

1.Inputting a toggling signal in GPOUT in shutdown mode,I'd like to know the reason why the fuel gauge is in normal condition.

  and I'd like to know the internal processing how to exit the shut down mode as detaile as possible if you can.

2.We decide to judge the wake-up from the shutdown mode by waching 1.8V of the VDD.

   Our  judgement is OK?

3.I'd like to know the typecal period time from when GPOUT detects the low voltage of a toggling signal  to when  VDD pin becomes 1.8V(wake-up from the shut down mode).