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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
您好，
请参考数据手册“图 8-1. Normal Setup”增加外部上拉电阻。
“Care should be taken to make sure VREF2 has an external resistor tied between it and VCC2. ”
PCA9306 双路双向 I2C 总线和 SMBus 电压电平转换器 datasheet (Rev. O) (ti.com.cn)
