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不明白bq2060a的REG引脚是做什么用的

Other Parts Discussed in Thread: BQ2060

 

上图是德州的bq2060-evm-01的原理图,我实在是不明白REG引脚的功能,REG引脚是怎样控制一个MOS管得到3.3V电压的,还有VCC引脚是哪里供电?BAT+的电压范围是多少,BAT+接的是哪一节电池,谢谢。