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按其datasheet（版本号：SPRS851B）描述为VSS，即接地，但官网提供的evm（gp，1.4A）原理图却是悬空，
到底该引脚该如何使用？
EVM中这个pin 应该是属于一个专门的模块的，一般不会用，应该可以悬空。
