Other Parts Discussed in Thread: PCA9306
您好,
PCA9306按照参考设计,低压供电1.8v,高压供电3.3v;实测发现高压供电3.3v后,低压供电端即使不供电,会有2.5v电压,请问是什么原因,谢谢!
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Vref1=1.8V,Vref2=2.5V?实际测试SCL1和SDA1都有2.5V电压?能否把原理图发上来看下?
你好,谢谢回复。Vref1=1.8V,Vref2=3.3V,上拉电阻两侧都是10K,Vref2通过200K电阻上拉至3.3V(按照手册的参考电路设计的)。另外1.8V电压是由3.3V经过TPS76318产生的,输入输出各加了0.1uf和10uf的电容。详见附件,测试TP1为2.43V,然后测试SCL1和SDA1都是2.43V。