哪个流程?
, pulling PWRKEY low is the normal way of turning on the handset,this will turn on vcore vio vm LDOS as long as the pwerkey is held low, the Vtcxo and via ldos is turned on as BB is on, the MICROPROCESSOR THEN STARTS AND PULLS INTERNAL NODE PWERBB high after which pwerkey can be released. 见23DATASHEET 313页。 不知道这个PWERBB是如何来拉拉高的?
请高手指教!