如上图所示;IIC外部有上拉电阻,但是主控芯片还没有焊接;使用万用表测量输出电压,输出电压在0.796V至0.805V之间波动,请问这是怎么回事?
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HI
也就是I2C没有给信号,芯片按照默认配置输出。 或者说,将R217, R219拿掉,看输出是否依旧存在不稳定?
如果依旧不稳定,建议你确认一下layout 。
同时将波形传上来看看?