根据SPEC要求,该芯片有两种使用方式,一是EN可以接到Vref2;二是EN可以额外增加控制信号;
我只是有个疑问:这颗芯片的两端电压值可以做两个非同源但电压值相同的隔离吗?比方说Vref1=Vref2=3.3V但非同源?EN上拉至Vref2。
谢谢。
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您好,
VREF1和VREF2不能是相同电压。
VREF1和VREF2定义如下:
VREF1:Low-voltage-side reference supply voltage for SCL1 and SDA1
VREF2:High-voltage-side reference supply voltage for SCL2 and SDA2
二者关系如下:
VREF1 supports 1.2 V to VREF2 - 0.6 V. VREF2 must be between VREF1 + 0.6 V to 5.5 V.
具体取值可以参考数据手册:
Allows voltage-level translation between:
– 1.2-V VREF1 and 1.8-V, 2.5-V, 3.3-V, or 5-V VREF2
– 1.8-V VREF1 and 2.5-V, 3.3-V, or 5-V VREF2
– 2.5-V VREF1 and 3.3-V or 5-V VREF2
– 3.3-V VREF1 and 5-V VREF2