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TPS65910A3A1断电后无法产生VRTC电压

Other Parts Discussed in Thread: AM3352

我是用的TPS65910A3A1,处理器是AM3352。电源供电的时候可以产生1.8V的VRTC。断电后只有电池供电时没有产生1.8V的VRTC,电池电压在3.1V左右,通过引脚27输入VBACKUP,但VRTC输出还是0V,因此时间日期不能保存。现在不知道是硬件问题还是软件问题。