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求助关于LSF0108(RKSR)信号电平的问题

Other Parts Discussed in Thread: LSF0108

LSF0108的电路图如上,B1管脚信号电平为3.3V,期望A1管脚的电平为1.8V,但是实际测量A1管脚开路电平为2.5V,请问是我的原理图设计有问题吗?麻烦各位大神指点一下,困在这里好久了!多谢!