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    参考设计绘制的PCB,3V3输出电压不对

    Wireless & Analog Series
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    • G
      gregrgr LV 5 last edited by

      da3fef24-fc17-494a-9558-0c03ab92d968-image.png
      这是为什么??? 是哪里设计有问题吗

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      • YuzukiTsuru
        柚木 鉉 LV 9 last edited by

        先检查一下外围有没有问题,这部分看着没什么大问题

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        • G
          gregrgr LV 5 @YuzukiTsuru last edited by

          @yuzukitsuru 对着参考原理图检查了很多次,没有差异

          YuzukiTsuru L 2 Replies Last reply Reply Quote Share 0
          • YuzukiTsuru
            柚木 鉉 LV 9 @gregrgr last edited by

            @gregrgr 外围设备呢,可能出现外围灌入IO的情况,因为内部这个电压是内置PMU管理的

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              gregrgr LV 5 @YuzukiTsuru last edited by

              @yuzukitsuru 没有外围,就一个最小系统。难不成是Tx和Rx拉高了?

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              • YuzukiTsuru
                柚木 鉉 LV 9 @gregrgr last edited by

                @gregrgr 对,参考我的

                d6d5eb44-d5ab-44eb-8c3f-fb496a79bd01-image.png

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                • G
                  gregrgr LV 5 @YuzukiTsuru last edited by

                  @yuzukitsuru 我把RX TX 都换成2K了,电压还是4V。在3.3V输出回路上,加颗灯反而正常了

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                  • YuzukiTsuru
                    柚木 鉉 LV 9 @gregrgr last edited by

                    @gregrgr 可能是有点漏电,不过其实不影响

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                    • G
                      gregrgr LV 5 @YuzukiTsuru last edited by

                      @yuzukitsuru 如果不用MCU对外供电,是不是那个电感可以省去

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                      • YuzukiTsuru
                        柚木 鉉 LV 9 @gregrgr last edited by

                        @gregrgr 没试过,可以试试看

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                        • Moved from 爱搞机专区 by  xiaowenge xiaowenge 
                        • Z
                          ZXY_Andy1998 LV 1 last edited by

                          up主,你这个问题解决了吗?我也碰到了这个3V3引脚输出4.3V

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                          • L
                            lovexulu LV 7 @gregrgr last edited by

                            @gregrgr ch340N供电改为3.3v即可。

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                            • L
                              lovexulu LV 7 @ZXY_Andy1998 last edited by

                              @zxy_andy1998 属于IO电压不匹配发生倒灌。

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