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关于EN1引脚电平异常导致4117停止工作的问题反馈 #7

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lukioc opened this issue Nov 16, 2024 · 0 comments
Open

关于EN1引脚电平异常导致4117停止工作的问题反馈 #7

lukioc opened this issue Nov 16, 2024 · 0 comments

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@lukioc
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lukioc commented Nov 16, 2024

UP你好,复刻后在测试过程中发现在电池供电开机的情况下,C口插入电源时有较高的概率会出现相机画面完全卡住不动的情况,此时按键和UI界面操作都是正常的,只有相机画面是卡住的;

然后经过测试发现是EN1在插入外部供电时可能是因为干扰的问题会产生异常掉电,控制CAM_GND的MOS管因此断开了CAM_GND与GND之间的连接,进而导致4117停止工作,不再传输新的画面到T113,所以发生画面卡住但UI正常的现象;

测试中只要给EN1外接一个更稳定的高电平输入就不会发生该问题;进一步测试发现电池供电时EN1引脚电压在1.6V左右,C口供电时EN1引脚电压约为2.5V,故考虑可能是电池供电时的EN1电压较为接近AO3402的阈值电压1.5V导致进而在受到干扰时容易被拉低;

个人建议硬件设计中可将AO3402换成其他阈值电压更低的N-MOS,或者重新修改单片机部分的相关代码。

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