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F28027-板子上电后芯片很烫

F28027-板子上电后芯片很烫,以前不烫,今天突然发现很烫,我现在上电可以进入调试界面,程序正常跑,但是芯片很烫,所以不敢通电太久。。。

请问这是什么原因???