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https://e2e.ti.com/support/data-converters-group/data-converters/f/data-converters-forum/632896/ads7955-unused-gpio-pins
ADS7955的GPIO引脚上是否存在内部上拉或下拉电阻器？ 如果没有，是否允许未使用的GPIO引脚浮动，或者是否应将其拉至已知电压水平？
