TI中文支持网Part Number:CC2340R5Other Parts Discussed in Thread: SYSCONFIG
芯片：CC2340R5 RGE QFN24
DIO21_A10作为模拟量输入采集接口
一、当直接连接运放的输出，运放输出电压低于3V，芯片不能正常启动。
（1）请问是需要串联匹配电阻吗，匹配电阻串联 多少合适？
（2）DIO21作为模拟量采集功能接口时，其内部电阻为多大？
二、串联10K电阻后，芯片能够正常运行，但采样值变化很大，这会是什么原因？
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根据 CC2340R5技术参考手册(www.ti.com/…/swcu193a.pdf)的第8.5.2节、DIO21默认配置为引导加载程序引脚触发器。 如果该引脚上的电压在启动时保持低电平、器件将进入引导加载程序。 您应该将系统重新配置为使用不同的引脚、或者如果您的应用不需要引导加载程序后门触发器、则会将其禁用。 SysConfig 中提供了以下选项：
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