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https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/683161/tm4c1294ncpdt-can-vref-pad-be-floating-if-external-analog-reference-not-used
如果未使用外部模拟基准、VREF+焊盘是否可以悬空？
建议的步骤是在未使用时将其连接到 t VDDA。 这来自数据表的第1816页：
