在使用ADG849时出现以下问题：
实现功能：ADG849供电电压为3.3V，S1接入3.3V，S2接入5.5V，D端作为电源输出端用来实现两路电源的切换；
问题：出现3.3V供电电压被抬升到5.0V的问题，其中S1与VDD接在一起。
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