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cc2530 P1_7悬空芯片无法正常启动问题

使用的是zstack home 2.5.2a,下载好sample api的终端程序,直接给2530vcc和GND供电,芯片无法正常工作,但是把P1_7引脚接地芯片就可以正常工作,悬空的话和接VCC芯片都无法正常启动。请问这个是什么原因造成的?