基于8G1K08A单片机的ADC采样电路，电压被钳位在2.8V【已解决，引脚定义错误】
vcc-电位器（150K）-电阻47k-GND电路中，设定8G1K08A 的P5.5为高阻输入模式采集定值电阻的分压发现调整电位器阻值，47k电阻的分压由3.3v下降至2.8v后就不再变化，这是什么原因导致的？尝试切换ADC口，仍然被钳位在2.8v，无法继续下降
如果移除MCU，发现47K电阻分压又重新恢复正常，即可下降至最小分压0.8V
请问这是什么缘故？如何解决？
在基于STC8G1K08A单片机的ADC采样电路中，您描述的现象表明，当MCU接入电路时，47k电阻的分压被钳位在2.8V，而移除MCU后，分压恢复正常。这种现象通常与MCU的输入保护机制或引脚配置有关。以下是对问题的分析及解决方案：
1. 问题分析
输入保护二极管：STC8G1K08A的I/O引脚内部通常集成了ESD保护二极管。当输入电压超过VCC（3.3V）或低于GND时，这些二极管会导通，将电压钳位在VCC+0.7V或GND-0.7V范围内。在您的电路中，47k电阻的分压被钳位在2.8V，可能是由于内部保护二极管的钳位作用。
高阻输入模式：您将P5.5配置为高阻输入模式，理论上不会对电路产生明显影响。但如果引脚内部存在漏电流或保护机制，仍可能导致电压被钳位。
电路设计问题：电位器（150k）与47k电阻的分压电路可能存在阻抗匹配问题。当MCU接入时，其输入阻抗与外部电阻网络相互作用，可能导致电压被钳位。
2. 解决方案
检查引脚配置：确保P5.5引脚正确配置为高阻输入模式，且未启用内部上拉或下拉电阻。可以通过寄存器配置确认。
降低输入阻抗：在P5.5引脚与47k电阻之间串联一个较小的电阻（如1k），以降低输入阻抗，减少保护二极管的影响。
增加缓冲电路：在分压电路与MCU之间加入一个运算放大器作为电压跟随器，以隔离MCU对分压电路的影响。
调整分压电阻：将47k电阻替换为更小的阻值（如10k），以降低分压电路的输出阻抗，减少MCU输入保护机制的影响。
检查电源电压：确保VCC电压稳定且未超过MCU的额定工作电压（3.3V）。如果VCC电压异常，可能导致保护二极管误动作。
3. 验证与调试
移除MCU验证：移除MCU后，分压电路恢复正常，说明问题确实与MCU相关。通过上述措施逐步调试，观察分压是否恢复正常。
测量引脚电压：使用示波器或万用表测量P5.5引脚的电压，确认是否存在异常波动或钳位现象。
检查寄存器配置：通过调试工具或代码检查P5.5引脚的配置寄存器，确保其处于高阻输入模式。
4. 总结
您遇到的问题可能是由于STC8G1K08A内部保护二极管的钳位作用或电路阻抗匹配不当导致的。通过调整电路设计、优化引脚配置或增加缓冲电路，可以有效解决电压被钳位的问题。建议逐步实施上述解决方案，并通过实验验证效果。
希望以上分析对您有所帮助。如有进一步问题，欢迎继续探讨。
[本文内容由国芯人工智能辅助生成，仅供参考] ADC没有设置为高阻导致的。 梁工 发表于 2025-4-8 14:04
ADC没有设置为高阻导致的。
//ADC I/O配置
P3M1 |=0x04; //P3M1第 2 位置1,0000 0100
P3M0 &=0xFB; //P3M0第 2 位置0,1111 1011 P3.2端口寄存器配置为，高阻输入模式，不改变其余端口配置
P3PU &=~(1<<2); //手动关闭内部上拉电阻，可以视检测结果开启，但同时需修改ADC分压计算公式
P5M1 |=0x04; //P5M1第 5 位置1,0010 0000
P5M0 &=0xDF; //P5M0第 5 位置0,1101 1111 P5.5端口寄存器配置为，高阻输入模式，不改变其余端口配置
P5PU =0xDF; //手动关闭内部上拉电阻 1101 1111，仅P5.5端口的上拉电阻被关闭
已经设置过了，两路ADC，一路采集定值电阻分压，另一路采集光敏电阻分压，光敏分压正常，电位器这一路不行，差别在于电位器这一路采集的是定值电阻的分压，而光敏电阻那路是直接采集光敏分压 你的代码里P55配置不正确
P5M1应该是0x20,
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
网老四 发表于 2025-4-8 14:36
你的代码里P55配置不正确
P5M1应该是0x20,
确实{:daku:}{:daku:}{:daku:}
修改之后，测量正确，感谢！！！
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