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    做了一块D1-H板子,LDOA_OUT输出只有1.2V?

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    • H
      htjgdw LV 4 last edited by htjgdw

      参考D1 Naze原理图做了一块板子。焊了供电,主芯片和晶振部分,上电不能启动。测量4路供电电压正常(1.1/0.9/1.5/3.3V)。LDOA_OUT只有1.2V(应该是1.8V),会是哪里出了问题呢?还有,FEL引脚虽然有3.3V上拉,但是FEL脚只有2.2V,都是很奇怪的现象,还没找到头绪。大家有没有遇到类似现象的呢?

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      • WhycanService
        WhycanService LV 8 last edited by

        LDOA固定1.8V,供PLL电,这个电源不够会导致系统时钟不起振。检查LDOA外围设计和是否存在短路

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        • H
          htjgdw LV 4 last edited by

          多谢建议。不过查短路可就难了,D1-H BGA 0.65mm pitch😧
          实在查不出来就再焊一块。

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          • H
            htjgdw LV 4 @WhycanService last edited by

            @whycanservice 重新补焊了几次D1-H,现在LDOA_OUT输出1.8V正常了。24M晶振引脚电压0.5V应该起振了。谢谢!接下来我试着进入FEL模式不过电脑设备管理器没反应。目前还没焊DDR3,进入FEL必须有DDR3内存吗?不太熟悉全志芯片,请大家指点。

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            • WhycanService
              WhycanService LV 8 last edited by

              不需要DDR3,FEL最小裸机启动的

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              • H
                htjgdw LV 4 @WhycanService last edited by

                @whycanservice 谢谢!进不了fel估计还是焊接的问题,继续补焊。

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                • H
                  htjgdw LV 4 @WhycanService last edited by

                  @whycanservice 最近几天FEL还是没成功(PC设备管理器里没发现新设备)。FEL启动除了用到USB0_DM/DP以外,对于USB_ID, USB0_VBUSDET(PD20), USB_DRVVBUS这三个引脚有要求吗?
                  1.png

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                  • WhycanService
                    WhycanService LV 8 @htjgdw last edited by

                    @htjgdw 没有要求,检查一下最小系统有没有起震

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                    • H
                      htjgdw LV 4 @WhycanService last edited by

                      @whycanservice 应该起振了。24M晶振两个引脚电压0.57V,32k晶振两引脚电压0.8V左右。

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                      • L
                        lgkgkfg LV 6 @htjgdw last edited by

                        @htjgdw 建议还是上图吧

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                        • H
                          htjgdw LV 4 @lgkgkfg last edited by

                          @lgkgkfg 好的,下面是我的板子上D1-H,电源,晶振相关的原理图。
                          3.png
                          2.png
                          1.png

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                          • H
                            htjgdw LV 4 last edited by

                            粉色电阻值是实际焊上去的。括号里的电压是实际测量的值。

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                            • WhycanService
                              WhycanService LV 8 @htjgdw last edited by

                              @htjgdw 检查一下是否有虚焊USB线,系统没什么大问题

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                              • H
                                htjgdw LV 4 @WhycanService last edited by

                                @whycanservice 焊了第二块板子,焊之前量了USB线路的联通性,没有问题。这次只焊了最小系统(电源,D1-H,晶振)。4路电压正常,但是LDOA_OUT是0V :(
                                D1-H用热风枪吹了几次感觉很正了,焊接时用镊子轻轻推也能自动回位。这次做D1-H,好让人崩溃。

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                                • WhycanService
                                  WhycanService LV 8 @htjgdw last edited by

                                  @htjgdw 检查一下LDO IN有没有输入

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                                  • H
                                    htjgdw LV 4 @WhycanService last edited by

                                    @whycanservice LDOIN从3.3V取电做输入,在pcb上可以量到LDOIN这个引脚的走线是3.3V,进入BGA底下LDOIN焊球那里就没法量了。0.65pitch的BGA焊接有什么特殊要求吗?我之前焊0.8,1.0pitch的BGA成功率很高的,基本都是一次过。

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