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请问当MSP430FR2311供电电压上升到3.5V时,IIC出现异常是什么原因?如何解决?

最近测试MSP430FR3211发现在 用3.3V以下电源供电的时候单片机系统正常运行,当电压升到3.5V以后单片机确定在运行,但是IIC两根线输出全是低,我们查了硬件和程序没发现异常,请TI技术论坛的高手分析一下,谢谢!