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PCA9306: VREF1异常电压抬升问题

Part Number: PCA9306

如图,将PCA9306用于iic 1.8v到3.3v电平转换,1.8V iic从机是sony的IMX283,主机为3.3V,目前现象为:

焊上U9后,VREF1也就是1.8V,会被稳定的抬升到2.2V,此时i2c scan能扫到从机地址,也就是能正常运行,但是电压高于IMX283的推荐工作电压

吹下U9后,1.8V供电恢复正常

PCA9306为立创商城购买,替换3片情况依旧

如何解决这个电压异常抬升的问题