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M430F5438芯片通电后3.3V电源短路,请问可能的原因,

Other Parts Discussed in Thread: MSP430F5525

近期调试M430F5438芯片,发现通电后3.3V电源短路,查找短路点发现为芯片内部短路。

后焊接第二套电路板,只焊接了430芯片和旁路电容,刚开始上电时电压正常,持续通电5分钟左右发现芯片再次短路,

请问是什么原因? 有没有可能芯片是假的?

芯片上批号为

14CTGDTG4

M430F5438

REV  L