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AM335X的电源问题

Other Parts Discussed in Thread: AM3352

TI的工程师你们好

情况是这样的,处理器AM3352由PMIC TPS65910A3提供电源 外设(网络芯片 nand芯片等)有另外的3.3V电源提供  

现在把外部3.3V电源断掉,并且把AM3352的SHV1-SHV6电源切断(SHV1-SHV6上串了个磁珠 现把磁珠拿掉)

给TPS65910A3输入5V,发现SHV6上有2.5V的电压,SHV1-SHV5上无电压,感觉好奇怪,这2.5V的电压是从哪里来的?是从GPIO引脚倒灌的吗?可是已经没有外部的3.3V电源了

这种现象可能的原因是什么?