手册上是这么说的:
VOPAMP1 Input Output reference voltage from internal operational amplifier 1
VOPAMP2 Input Output reference voltage from internal operational amplifier 2
VOPAMP3 Input Output reference voltage from internal operational amplifier 3
VOPAMP4 Input Output reference voltage from internal operational amplifier 4
我估计写法有错误, 可能是内部运放的输出吧
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