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TPS65910: RTC输出电压2.31V,正常应该是1.8V,什么原因会导致这种情况

Part Number: TPS65910
Other Parts Discussed in Thread: AM3358,

tps65910给AM3358提供电源,上电3358不启动,发现上电后电源轨RTC电压为2.31V,AM3358反馈的PMIC_EN信号也是2.31V,请问为什么会这样?