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CC3200 硬件问题

Other Parts Discussed in Thread: CC3200, CC3100

用 CC3200 做的2层板子,测量 CC3200 Pin38 (DCDC_ANA_SW)经过 2.2uH 电感后的电压在 0~2V 之间跳变,而不是稳定的 1.8V(请见附图),原理图是参照 CC3200 datasheet 参考设计的,做过的高人能帮忙分析下原因吗? 多谢了!