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TI 的官方技术手册：SCLA015
此处计算逻辑器件的上拉阻值，求解参数 2.2是怎么算得来的，谢谢
相信TI的工程师是不会随意定义一个数字的。麻烦您升级一下。即使不做详细的推导，但至少说明出处。
