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关于电源芯片TPS65266RHBR的疑问

TPS65266RHBR的AGND管脚之间是导通的吗?我用万用表测量该芯片的1 2 3脚,他们并不导通。是我买到的芯片有问题还是该芯片设计时内部AGND独立,需要外接在一起?