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DP83867IRPAP采用双电源供电,IO电压为3.3V,VDDA2P5和VDD1P1供电电压在DCDC端正常。经过磁珠进入PHY芯片后,2V5变成3.14V左右。断开磁珠后,磁珠前级DCDC也是2V5, 磁珠后级PHY端依然有3.14V左右的电压。
DEBUG手段:
1. 取下芯片后,磁珠前后级都是2v5。
2. 因为是配置为advertise ablility of 10/100/1000, aneg_sel0和aneg_sel1都为0,MODE1为上下拉OPEN.Rb
3.RBIAS确认是11K±1%精度。
请问还有其他原因导致这样的问题吗?
您好,
VDDA2P5电压异常是吗?您描述说“DP83867IRPAP采用双电源供电”具体是什么意思?
您测试了几块板子是这种现象?可以附上电路图看下吗?